WBBSE Solutions For Class 9 Life Science And Environment Chapter 2 Organic And Inorganic Molecules

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Summary

1. It can be understood by studying different levels of organization of life, that the body of a living organism is primarily composed of different organic and inorganic molecules.
   
2. The next level of organization of the body of a living organism is the cellular level.
3. A group of structurally and functionally similar cells and their inter-cellular material constitute to form a tissue.
   
4. Several tissues combine to form an organ and some organs unite to form an organ system.
5. The biological levels of organization of living things arranged from the simplest to most complex form are- biomolecules cells tissues organs organ systems organisms.
   
6. The major inorganic compounds, which are essential for living organisms, are water, inorganic acids, bases, salts, and inorganic gases like oxygen, carbon dioxide, and nitric oxide.
7. Water, being a universal solvent, is essential for controlling all physiological reactions in a living body.
8. Inorganic acids and bases are required for digestion and to maintain acid-base balance within the body and cells.
9. Salts take part in the contraction of muscles, the transmission of nerve impulses, and the production of, hormones.
10. Inorganic gases are required for various processes.
    
11. For example, O₂ is required for respiration and CO₂ for photosynthesis.
12. Organic molecules are of two types-smaller organic molecules and larger organic molecules.
    
13. Smaller organic molecules include simple sugars, (like glucose, ribose, etc.) different amino acids, fatty acids, and nucleotides.
14. Glucose acts as the main respiratory substrate, ribose molecules form the basic structure of DNA and RNA.
15. Amino acids take part in the formation of proteins, hormones, enzymes, etc.
    
16. Along with fatty acids, they involve in forming different cellular structures.
17. Nucleotides constitute large nucleic acid molecules, like DNA and RNA.
18. Complex sugars, proteins, lipids, and nucleic acids are large organic molecules.
19. Monosaccharides, like glucose, fructose, etc. are held together by glycosidic bonds to form large and complex sugars.
20. When connected together by a series of peptide bonds, amino acids form proteins.
21. Simple protein constitutes only amino acids.
22. When some non-protein molecules combine with simple proteins, ‘conjugate proteins are formed.
23. The metabolic breakdown of simple and conjugate proteins forms the derived proteins.
24. Esterification of fatty acids with glycerols or other alcohols forms large lipid molecules. 
25. Within living cells, food materials are stored in the form of complex carbohydrates, like starch and glycogen.
26. Within a living organism, proteins take part in building cells and tissues, lipids provide energy and act as reserve food materials, and nucleic acids, like DNA and RNA, act as genetic material.
27. ATP is a nucleotide that has three phosphate radicals.
28. It acts as energy currency in living cells and provides necessary energy during different physiological reactions.

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Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Summary Answer In A Single Word Sentance

Question 1. What are biomolecules?

Answer:

Biomolecules:-

Biomolecules are organic molecules. produced or involved in various biochemical reactions within the cells or inside the body.

Question 2. Inorganic acid plays a very important role in our digestion process.

Answer:

Hydrochloric acid is an inorganic acid, which plays an important role in our digestion process.

Question 3. Name a weak acid.

Answer:

Weak Acid:-

Carbonic acid (H₂C0₃)

Question 4. What does carbonic acid do in our bodies?

Answer:

Carbonic acid is involved in the transportation of C0₂, out of the body, via the respiratory exchange of gases.

Question 5. Which two elements are essential for neural transport?

Answer:

Sodium and potassium

West Bengal Board Class 9 Life Science Book Solution

Question 6. Which gas is involved in energy generation in a living body?

Answer:

Oxygen

Question 7. What is calorific value?

Answer:

The total heat energy liberated by the complete oxidation of the unit mass of a matter is known as its calorific value.

Question 8. Which biomolecule is the primary source of energy in our body?

Answer:

Carbohydrate

Question 9. Which anabolic process needs C0₂?

Answer:

Photosynthesis

Question 10. Which is the most abundant salt in our body?

Answer:

Sodium chloride (NaCl)

Question 11. Which two elements are essential for our skeletal system?

Answer:

Calcium and phosphorus

Question 12. Which type of biomolecule is commonly consumed by organisms for energy generation?

Answer:

Carbohydrates.

Question 13. How much heat energy is liberated from one gram of glucose on its complete oxidation?

Answer:

4.1 kcal

Question 14. Name an aldose and a ketose sugar.

Answer:

Glucose is an aldose and fructose is a ketose sugar.

Question15. Name a reducing sugar.

Answer:

Glucose is a reducing sugar.

Question6. Name a nonreducing sugar.

Answer:

Sucrose is a nonreducing sugar.

Question 17. Write down the common formula of carbohydrates.

Answer:

C_n(H₂O)_n

Question 18. Mention the ratio of hydrogen and oxygen in carbohydrates.

Answer:

2:1

Question 19. Which is the smallest unit of carbohydrate, used as food?

Answer:

Glucose, fructose, etc.

Question 20. Name two triose sugars.

Answer:

Two triose sugars are mannotriose and dihydroxyacetone.

Question 21. Name the sweetest carbohydrate.

Answer:

The sweetest carbohydrate is fructose or fruit sugar.

Question 22. What is ‘Magic 20’?

Answer:

20 amino acids, which take part in protein formation, are known as ‘Magic 20’

Question 23. Oxidation of which amino acid results in the formation of melanin pigment?

Answer:

Tyrosine

Question 24. Give an example of an essential amino acid.

Answer:

Valine, tyrosine

Question 25. Name some essential fatty acids.

Answer:

Linoleic acid, linolenic acid, arachidonic . acid

Question 26. What is the full form of MUFA?

Answer:

MUFA is Mono Unsaturated Fatty Acid.

WB Class 9 Life Science Question Answer

Question 27. Give two examples of short-chain fatty acids.

Answer:

Caproic acid, butyric acid.

Question 28. Give two examples of long-chain fatty acids.

Answer:

Palmitic acid, stearic acid

Question 29. What is the similarity among monosaccharides, amino acids, and fatty acids?

Answer:

Monosaccharides, amino acids, and fatty acids are all organic macromolecules.

Question 30. How do you denote the sugars composed of 2 to 9 monosaccharide units?

Answer:

The sugars with 2 to 9 monosaccharide units are denoted as oligosaccharides.

Question 31. Which type of sugar is generally insoluble in water and tasteless in nature?

Answer:

Polysaccharides

Question 32. Which form of carbohydrate is stored in muscle and liver?

Answer:

Glycogen

Question 33. Which form of carbohydrate is stored in the plant body?

Answer:

Starch

Question 34. Which type of material in food helps in feces formation and facilitates defecation?

Answer:

A polysaccharide, called cellulose, helps in feces formation and facilitates defecation.

Question 35. What is the minimum number of monosaccharides required to form a polysaccharide?

Answer:

At least 10 monosaccharide molecules are necessary to constitute a polysaccharide.

WB Class 9 Life Science Question Answer

Question 36. Which type of biomolecule is commonly consumed by organisms as body-building materials?

Answer:

Living organisms commonly consume proteins as body-building materials.

Question 37. What is meant by a polypeptide?

Answer:

Large polymers of numerous amino acid molecules, linked together by peptide bonds, are known as polypeptides.

Question 38. Name the structural unit of the protein.

Answer:

Amino acid

Question 39.  Which element, present in protein, is absent in carbohydrates?

Answer:

Nitrogen

Question 40. How much energy is generated by the oxidation of 1 gram of protein?

Answer:

4.1 kcal’

Question 41. Which parts of the animal body contain keratin protein?

Answer:

Skin, hair, nail, hoof, horn, etc.

Question 42. Name two contractile proteins.

Answer:

Actin, myosin

Question 43. Name a basic protein.

Answer:

Histone is a basic protein.

Question 44. Which type of food should a growing baby be fed with?

Answer:

A growing baby should be fed protein-rich food for maximum muscular growth.

WB Class 9 Life Science Question Answer

Question 45. Which type of biomolecule does living organisms commonly store within the body?

Answer:

Living organisms commonly store fat within the body.

Question 46. Which two simplest molecular units form a lipid molecule?

Answer:

Fatty acid and glycerol

Question 47. In the animal body, fat is stored in which tissue?

Answer:

Adipose tissue

Question 48. Which biomolecule has the highest calorific value?

Answer:

Fat or lipid has the highest calorific value.

Question 49. How much energy is generated by the oxidation of 1 gram of lipid?

Answer:

9.3 kcal

Question 50. Which nucleic acid is mainly involved in carrying hereditary features from parents to offspring in humans?

Answer:

Mainly DNA is involved in carrying hereditary features from parents to offspring.

Question 51. How are the two strands of a DNA molecule zipped together?

Answer:

The two strands of a DNA molecule are zipped together by weak hydrogen bonds between the bases.

Question 52. Name the bond by which nucleosides of a nucleic acid strand remain attached one after another.

Answer:

The nucleosides of a nucleic acid strand remain attached one after another by phosphate bonds.

Question 53. Mention the names of different purines.

Answer:

Adenine [A] and guanine [G]

Question 54. Mention the names of different types of pyrimidines.

Answer:

Thymine [T], cytosine [C], and uracil [U]

Question 55. Which type of pyrimidine bases are present in DNA?

Answer:

Thymine and cytosine

WB Class 9 Life Science Question Answer

Question 56. Which type of pyrimidine bases are present in RNA?

Answer:

Uracil and cytosine

Question 57. How many hydrogen bonds join guanine with cytosine?

Answer:

Three

Question 58. How many hydrogen bonds join adenine with thymine?

Answer:

Two

Chapter 2 Topic A Biomolecules And Their Behavior Fill In The Blanks

1. Water acts as the medium of all cellular reactions within protoplasm.

2. NaHS0₄ is an Acidic salt.

3. Maltotriose is an example of an Oligo saccharide.

4. A glycoside bond binds two glucose molecules while forming disaccharides.

5. The food, synthesized by green plants through the process of photosynthesis, is Glucose.

6. Glucose + fructose = Sucrose

7. Oligosaccharides consist of 2 – 9 molecules of Monosaccharides

8. Leucine is an Essential amino acid

9. Amino acids join one after another by Peptide bonds to form polypeptide molecules.

10. Nucleotides are joined by phosphodiester bonds.

11. Linoleic acid Palmitic acid is an example of a long-chain fatty acid.

12. Nitrogenous base + pentose sugar = Nucleoside

13. The structural unit of protein is the Amino acid

14. The main elementary component of protein is Nitrogen

15. Simple protein, when combined with other non-protein material, Conjugated protein is formed.

16. The name of the protein present in the white part of the egg is Albumin

17. Fat is the Ester of fatty acids and glycerol.

18. In the process of Saponification fats are hydrolyzed in the presence of alkali to produce soap and glycerol.

19. In animals fat is stored in the blood as Cholesterol

20 The largest biomolecule, present in the living body is DNA

WB Class 9 Life Science Question Answer

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Summary  True Or False

Question 1. Glucose is a pentose sugar.

Answer: False

Question 2. C_n (H₂0)_n-1 is the basic molecular formula of oligosaccharides.

Answer: True

Question 3.  Carbonic acid is involved in the transportation of co₂.

Answer: True

Question 4. Roughage mainly consists of cellulose.

Answer: True

Question 5. We may suffer from ketosis due to malnutrition or fat.

Answer: False

Question 6. Disaccharides cannot be hydrolyzed further to their smaller units.

Answer: False

Question 7. Cytosine is a non-nitrogenous base present in DNA.

Answer: False

Question 8. Nonhistone proteins are basic in nature.

Answer: False

Question 9. Disaccharide maltose is present in jaggery.

Answer: True

Question 10. In simple sugar, the ratio of carbon, hydrogen, and oxygen is 1:4:1.

Answer: False

Question 11. Linoleic acid is an amino acid.

Answer: False

Question 12. Glycogen is a simple carbohydrate.

Answer: False

Question 13. The calorific value of protein is 5.2 kcal/gm.

Answer: False

Question 14. Nitrogen is a structural unit of protein, but not present in fat and sugars.

Answer: True

Question 15. The main sources of carbohydrates are nuts, ghee, butter, etc.

Answer: False

WB Class 9 Life Science Question Answer

Question 16. The structural unit of DNA and RNA is a nucleotide.

Answer: True

Question 17. The sugar present in DNA has six carbon atoms.

Answer: False

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Summary Match The Columns

Answer: 1-C; 2-G; 3-A; 4-F; 5-B; 6-D

Answer: 1-D; 2-B; 3-A; 4-F; 5-G; 6-E

Answer: 1-F; 2-E; 3-B; 4-A; 5-C; 6-D

WB Class 9 Life Science Question Answer

Answer: 1-E; 2-D; 3-B;4-A; 5-C; 6-G

Answer: 1-D; 2-A; 3-B; 4-F; 5-C; 6-G

Answer: 1-B; 2-D; 3-F; 4-A; 5-C; 6-E

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Summary  Find The Odd One Out

Question 1. Simple sugar, Amino acid, Starch, Lactose

Answer: Amino acid

Question 2. Water, Hydrochloric acid, Carbon dioxide Lipid

Answer: Lipid

Question 3. HCL, NaOH, H₃P0₄ H₂C0₃

Answer:  NaOH

Question 4. HCI,H₃PO₄,KCI,H₂SO₄

Answer:  KCI

Question 5. Calcium Phosphate, Sodium Chloride, Sodium Hydroxide, Sodium Iodide

Answer:  Sodium Hydroxide

Question 6. Jaggery, Sugar, Egg, Rice

Answer:  EGG

Question 7. Albumin, Globulin, Glycogen, Haemoglobin

Answer:  Glycogen

Question 8. Butter, Ghee, Fish, Oil

Answer:  Fish

Question 9. Adenine, Thymine, Linoleic acid, Guanine

Answer: Linoleic acid

Question 10. Phosphate, Nitrogenous base, Ribose sugar, Fat

Answer: Fat

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Summary Fill In The Blanks By Looking At The First Pair

1. Amino acid: Protein:: Monosaccharide: Carbohydrate

2 Albumin: Simple protein:: Arachidonic acid: Essential fatty acid

3. Maltose: Disaccharide:: Glycogen: Polysaccharide

4. Collagen: Protein:: Glucose: Carbohydrate

5. Glycosidic bond : Polysaccharide:: Peptide bond: Protein

6. Ribose sugar : RNA:: Deoxyribose sugar: DNA

7. Adenine: Purine:: Thymine: Pyrimidine

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Summary Among The Four Concepts Given, Three Of Them Belong To One Find That

Question 1. Water, Inorganic molecules, Base, Mineral element

Answer: Inorganic molecule

Question 2. HC1, Bicarbonate ion, Inorganic molecule, NaCl

Answer: Inorganic molecule

Question 3. Inorganic acid, HC1, H₂S0₄, H₃P0₄

Answer: Inorganic acid

Question 4.  Carbohydrates, Lipid, Nucleic acid, Organic molecule

Answer: Organic molecule

Question 5. Lactose, Starch, Cellulose, Carbohydrate

Answer: Carbohydrates

Question 6. Starch, Protein, Large organic molecule, Nucleic acid

Answer: Large organic molecule

Question 7. Maltose, Disaccharide, Lactose, Sucrose

Answer: Disaccharide

Question 8. Simple sugar, Erythrose, Ribose, Glucose

Answer: Simple sugar

Question 9. Amino acid, Polypeptide, Peptide bond, Protein

Answer: Protein

Question 10. Energy production, Rice, fruit juice, Carbohydrate

Answer: Carbohydrate

Question 11. A nitrogenous base, Adenine, guanine, Cytosine

Answer: Nitrogenous base

Question 12. Nucleotide, Pentose sugar, Phosphate, Nitrogenous base

Answer: Nucleotide

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules

1. Vitamins and minérals do not provide energy but these food components protect our body. 

2. The food components, which are required in a very small quantity to protect our body against diseases and to help in normal growth and nutrition, are called vitamins. 

3. Based on solubility vitamins are of two types soluble and water soluble.

4. Fat-soluble vitamins are Vitamins A, D, E, and K.

5. Water soluble vitamins are Vitamin B complex, C, and P.

6. Vitamin A is commonly present in red, orange, or yellow-colored vegetables and fruits. 

7. This vitamin is required to produce Rhodopsin pigment in the eyes. 

8. This pigment helps to see in dim light.

9. Due to its deficiency, occurs night-blindness.

10. Vitamin D helps in calcium and phosphate absorption from the intestine. 

11. It helps in the formation of bones and teeth.

12. The scarcity of this vitamin during infancy causes rickets and osteomalacia in adults.

13. Vitamin E reduces cellular oxidation and prevents sterility in females.

14. Vitamin K prevents bleeding by helping in the blood coagulation process.

15. Vitamin B complex is a combination of eight vitamins. 

16. All these act as coenzymes. 

17. Diseases like beriberi, pernicious anemia, dermatitis, and chilosis may occur due to its deficiency.

18. Vitamin C is adequately present in lemon, amla, orange, etc. It helps in strengthening gums.

19. Its deficiency causes a disease called scurvy.

20. Based on the requirement, in the human body mineral elements can be divided into two types- macro-elements and micro-elements. 

WB Class 9 Life Science Question Answer

21. Macro-elements are required in larger quantities, whereas, micro-elements are required in smaller quantities.

22. Elements like sodium, potassium, calcium, phosphorus, etc., are the macro-elements, and iron, zinc, iodine, etc., belong to the category of micro-elements.

23. Usually, mineral elements act as cofactors of different enzymes. 

24. These also help in various metabolic reactions, hormone synthesis, transportation of nutrients, maintenance of water balance in the body, formation of gums and teeth, etc,

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Answer In A Single Word Sentence

Question 1. Who discovered vitamins?

Answer: Casimir Funk [1912]

Question  2. Which vitamin did Casimir Funk discover the first?

Answer: Niacin or vitamin B₃

Question  3. What is the chemical name of vitamin A? 

Answer: Retinol

Question  4. Deficiency of which vitamin may cause night blindness? Or Which type of vitamin should a person take in for problems with vision after sunset?

Answer: Vitamin A

Question  5. Mention the name of the provitamin of vitamin A. Or,  From which compound is vitamin A synthesized?

Answer: Beta carotene

Question  6. Which vitamin does play an important role in producing rod cells of the retina?

Answer: Vitamin A

Question  7. Name some diseases caused by to deficiency of vitamin A.

Answer: Some diseases caused due to deficiency of vitamin A are tanned skin or phrynoderma, night blindness or nyctalopia, damaged cornea or xerophthalmia, etc.

Question  8. Deficiency of which vitamin does cause phrynoderma? 

Answer: Vitamin A

Question  9. What is phrynoderma?

Answer: Due to a deficiency of vitamin A, human skin may become dry, rough, and scaly. This disease is called phrynoderma.

Question  10. Deficiency of which vitamin does cause rickets in children?

Answer: Vitamin D

Question 11. Deficiency of which nutrient does cause bending of leg bones in children?

Answer: Vitamin D

Question 12. Deficiency of which vitamin does cause osteomalacia in older persons?

Answer: Vitamin D

Question 13. Which vitamin is synthesized within our skin on exposure to the sun? 

Answer: Vitamin D

Question 14. Which type of organisms synthesizes the most vitamins?

Answer: The green plants

Question 15. Name an abnormal condition caused due to deficiency of vitamin E. 

Answer: Sterility

Question 16. What is the chemical name of Vitamin E?

Answer: Phylloquinone

Question 17. Deficiency of which vitamin causes bleeding in the human body? Or Deficiency of which vitamin does hamper blood clotting?

Answer: Vitamin K

Question 18. Name the water-soluble vitamins.

Answer: Water soluble vitamins are Vitamin B complex, Vitamin C, and Vitamin P.

Question 19. What is the chemical name of vitamin B1?

Answer: Thiamine

Question 20. Name the antivitamin of vitamin B,? 

 Answer: Pyrithiamine

Question 21. Where is vitamin B₂ synthesized?

Answer: Vitamin B₂ is synthesized in the human intestine.

Question 22. Mention the chemical name of vitamin B₃.

Answer: Niacin

Question 23. What is the chemical name of vitamin C? 

Answer: Ascorbic acid

Question 24. Which vitamin is adequately present in amla? 

Answer: Vitamin C

Question 25. Deficiency of which vitamin does cause scurvy?

Answer: Vitamin C

Question 26. What is the chemical name of vitamin P? 

Answer: Citrine

Question 27. Name two fat-soluble vitamins, present in eggs. 

Answer: Vitamin A and vitamin D

Question 28. Name two vitamins present in lemon.

Answer: Vitamin C and vitamin P

Question 29. What is the chemical name of vitamin D?

Answer: Calciferol

Question 30. Deficiency of which vitamin does result in deformity of teeth and gum? 

Answer: Vitamin C

Question 31. Name the disease that occurs in children due to a deficiency of iodine. 

Answer: Cretinism

Question 32. Which mineral does play an important role in RNA synthesis?

Answer: Manganese

Question 33. Which mineral is essential for hemoglobin formation?

Answer: Iron [Fe]

Question 34. Which mineral is essential in blood coagulation? 

Answer: Calcium

Question 35. Name the disease of aged women in which calcium dissociation occurs from bone. 

Answer: Osteoporosis

Question 36. Which symptoms appear due to potassium deficiency?

Answer: Nervous and cardiac disorder

Question 37. Which organ of the human body does play an important role in maintaining a balance of sodium and potassium? 

Answer: Kidney

Question 38. Deficiency of which vitamins and minerals cause rickets in children?

Answer: The deficiency of vitamin D and mineral calcium causes rickets in children.

Question 39. Deficiency of which mineral does cause goiter?

Answer: Iodine

Question 40. Synthesis of which vitamin does require cobalt?

Answer: Cyanocobalamin or vitamin B₁₂

Question 41. Which mineral does help in muscle contraction?

Answer: Calcium

Question 42. Which of the ions play an important role in maintaining water balance in the human body?

Answer: Na+ and K+

Question 43. Name an iron-containing enzyme.

Answer: Catalase is an iron-containing enzyme.

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Fill In The Blanks

1. In 1912 the term ‘Vitamin’ was coined by  Casimir Funk

2. Biotin was previously known as Vitamin H

3. The chemical name of vitamin K is Phylloquinone.

4. We obtain vitamin  B₁₂ from Streptomyces griseus.  

5. Osteoporosis is caused due to the deficiency of Calcium bones.

6. Night blindness is caused by a deficiency of vitamin A or Retinol 

7.  Calciferol is the chemical name of vitamin D.

8. Vitamin D is called an antirachitic factor.

9. Sterility may occur due to the deficiency of E.

10. Haemorrhage is caused due to a deficiency of vitamin K.

11. Dermatitis and cheilosis occur due to the deficiency of vitamin B₂

12. Vitamin C is called an antiscorbutic factor.

13. The disease that may develop due to the deficiency of iron in the human body is Anaemia

14. The mineral Sodium balance in the blood.

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules True Or False

Question 1. Avitaminosis refers to a state of lacking vitamins

Answer: True

Question 2. The chemical name of vitamin B₁₂ is cyanocobalamin.

Answer: True

Question 3. Vitamin C can be dissolved in water.

Answer: True

Question 4. In the presence of sunlight vitamin D is synthesized within the human body.

Answer: True

Question 5. Vitamin B₁₂ helps in the formation of rod cells in the retina.

Answer: False

Question 6. Vitamin D plays an important role in blood coagulation.

Answer: False

Question 7. Vitamin D is absorbed directly in the intestine.

Answer: True

Question 8. Vitamin D acts mainly as a cofactor of enzymes.

Answer: False

Question 9. Vitamin D helps in calcium absorption.

Answer: True

Question 10. Night blindness is caused due a deficiency of vitamin K.

Answer: False

Question 11. Cobalt is a mineral that takes part in vitamin B₁₂ synthesis.

Answer: True

Question 12. Micronutrients are known as trace elements.

Answer: True

Question 13.  Iodine in humans is a trace element.

Answer: True

Question 14. The nutritional importance of pseudo-vitamins is like that of the vitamins themselves.

Answer: False

Question15. Organic acids act as cofactors of enzymes.

Answer: False

Question 16. In the deficiency of vitamin K, blood coagulation is hampered.

Answer: True

Question 17. Iron takes part in the formation of the haem portion of a hemoglobin molecule.

Answer: True

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Match The Columns

Answer: 1-D; 2-E; 3-B; 4-A; 5-C

Answer: 1-F; 2-C; 3-D; 4-G; 5-B; 6-A

Answer: 1-G; 2-F; 3-A; 4-E; 5-D

Answer: 1-F; 2-G; 3-E; 4-A; 5-B; 6-C

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Find The Odd One Out

Question 1. Vitamin A, Vitamin C, Vitamin D, Vitamin E 

Answer: Vitamin C

Question 2. Sodium, Calcium, Manganese, Phosphorus 

Answer: Manganese

Question 3. Zinc, Selenium, Molybdenum, Magnesium

Answer: Magnesium

Question 4. Vitamin A, Vitamin B complex, Vitamin E, Vitamin K

Answer: Vit. B complex

Question 5. Magnesium, Calcium, Potassium, Cobalt

Answer: Cobalt

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Fill In The Blanks By Looking At The First Pair

Question 1. Antisterility factor: Vitamin E Antixerophthalmic Factor: Vitamin A 

Question 2. Vitamin A: Fat-soluble:: Vitamin C: Water-soluble 

Question 3. Night blindness: Vitamin A:: Rickets: Vitamin D 

Question 4. Synthesized in skin: Vitamin D:: Synthesised in the intestine: Vitamin B₁₂

Question 5. Calciferol: Vitamin D :: Ascorbic acid: Vitamin C

Question 6. Phrynoderma: Vitamin A:: Scurvy: Vitamin C

Question 7. Carrot: Vitamin A:: Lemon: Vitamin C

Question 8. Xerophthalmia: Vitamin A :: Pernicious anemia: Vitamin B₁₂

Question 9. Contraction of muscles: Calcium: Contraction of heart muscles: Sodium

Question 10. Deficiency of iodine: Goitre:: Deficiency of iron: Anaemia

Question 11. Antivitamin: Galactoflavin:: Pseudovitamin: Methylcobalamin

Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Among The Four Concepts Given, Three Of Them Belong To One. Find That

Question 1. Iron, Iodine, Copper, Micro-elements

Answer: Micro-elements

Question 2. Macronutrients, Sodium, Calcium, Phosphorus,

Answer: Macronutrient

Question 3. Cobalt, Copper, Manganese, Micronutrients

Answer: Micronutrients

Question 4. Retinol, Fat-soluble vitamin, Calciferol, Phylloquinone

Answer: Fat-soluble vitamin

Question 5. Water-soluble vitamins, Ascorbic acid, Thiamine, Riboflavin

Answer: Water-soluble vitamin