Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules Summary Multiple Choice Questions
Question 1. The most abundant element within a living body is
- Carbon, water, and oxygen
- Carbon and nitrogen
- Water.
- Oxygen, hydrogen, carbon, and nitrogen
Answer: 4. Oxygen, hydrogen, carbon, and nitrogen
Question 2. In plants, the medium of transport is
- Water
- Phloem
- Xylem
- Both A and B
Answer: 1. Water
Question 3. HCI in the stomach helps in the digestion of
- Protein
- Lactose
- Maltose
- Fructose
Answer: 1. Lactose
Question 4. Acidic chyme in the stomach is neutralized by
- Bile salt
- Sodium bicarbonate
- NaOH
- KOH
Answer: 2. Sodium bicarbonate
WBBSE Class 9 Organic and Inorganic Molecules MCQs
Question 5. Which of the following is not a strong acid?
- HNO3
- HCI
- H2CO3
- H2SO4
Answer: 3. H2CO3
WBBSE Class 9 Life Science Question And Answer
Question 6. An example of weak alkali is
- NH4OH
- NaOH
- KOH
- None of these
Answer: 1. NH4OH
Question 7. The percentage of mineral salts present in cellular components is
- 10-30%
- 1-3%
- 0.1-0.3%
- 0.01-0.03%
Answer: 2. 1-3%
Question 8. A biomacromolecule is
- Glucose
- Peptide
- Lipid
- Protein
Answer: 1. Glucose
Important MCQs on Organic Molecules for Class 9
Question 9. Which one is an organic acid?
- h2so4
- hno3
- HCI
- Maleic acid
Answer: 4. Maleic acid
Question 10. Which of the following is not an organic macromolecule?
- DNA
- RNA
- Nucleotide
- Protein
Answer: 3. Nucleotide
WBBSE Class 9 Life Science Question And Answer
Question 11. The main energy-generating biomolecule is
- Protein
- Carbohydrate
- Fat
- Vitamin
Answer: 2. Carbohydrate
Question 12. In which of the following biomolecules do carbon, hydrogen, and oxygen maintain a ratio of 1:2:1?
- Nucleotide
- Protein
- Fatty acid
- Carbohydrate
Answer: 4. Carbohydrate
Question 13. The simple structural formula of carbohydrates is
- cn(H2O)n-1
- (C6H10O5)n
- (CH20)n
- R-COOH
Answer: 3. (C6H10O5)n
Inorganic Molecules MCQs for Class 9 Life Science
Question 14. The simplest form of sugar is
- Glucose
- Sucrose
- Cellulose
- Lactose
Answer: 1. Glucose
Question 15. Which of the following is not a hexose sugar?
- Glucose
- Galactose
- Ribose
- Fructose
Answer: 3. Ribose
Question 16. Which of the following carbohydrates is not a keto sugar?
- Erythrose
- Fructose
- Xylulose
- Ribulose
Answer: 1. Erythrose
Question 17. The main sugar present in honey is
- Glucose
- Fructose
- Sucrose
- Maltose
Answer: 2. Fructose
Question 18. The sugar present in sugarcane juice is
- Fructose
- Glucose
- Maltose
- Sucrose
Answer: 2. Sucrose
Question 19. Commonly used table sugar is
- Maltose
- Lactose
- Sucrose
- Glucose
Answer: 3. Sucrose
Question 20. The sugar present in the ONA molecule is composed of
- 6-Carbon
- 5-Carbon
- 4-Carbon
- 1-Carbon
Answer: 2. 5-Carbon
Practice MCQs for Class 9 Life Science Chapter 2
Question 21. Besides the amino group, the other functional group present in an amino acid is
- Hydroxyl group
- Carboxyl group
- Aldehyde group
- Ketone group
Answer: 2. Carboxyl group
Question 22. The number of amino acids taking part in protein synthesis is
- 10
- 20
- 30
- 40
Answer: 2. 20
Question 23. An essential amino acid is
- Valine
- Glutamic acid
- Argentine
- Glycine
Answer: 1. Valine.
Question 24. The simple structural formula of an amino acid is
- R-CHNH2COOH
- NH2-R = CO
- R-COOK
- R-NH2
Answer: 1. R-CHNH2COOH
Question 25. A sulfur-containing amino acid is
- Serine
- Valine
- Methionine
- Isoleucine
Answer: 2. Methionine
Question 26. A hydrophobic amino acid is
- Leucine
- Tyrosine
- Histidine
- Serine
Answer: 1. Leucine
Question 27. The two functional groups present in amino acids are
- Amin and Ketone
- Amino and Carboxyl
- Amino and Aldehyde
- Amino and Hydroxyl
Answer: 2. Amino and Carboxyl
West Bengal Board Class 9 Life Science Book Solution
Question 28. The important structural element of amino acids is
- N
- O
- H
- Na
Answer: 1. N
Question 29. Each fatty acid has a hydrocarbon chain ending with
- Hydroxyl group
- Aldehyde group
- Ketone group
- Carboxyl group
Answer: 4. Carboxyl group
Question 30. Carboxyl group An essential fatty acid is
- Stearic acid
- Oleic acid
- Linolenic acid
- All of these
Answer: 3. Linolenic acid
Key Concepts for MCQs on Organic and Inorganic Molecules
Question 31. A chromosome is a
- Combination of many nucleotides
- Nucleoprotein substance
- Combination of many proteins
- Combination of proteins and lipids
Answer: 1. Combination of many nucleotides
Question 32. Which of the following share the same class with glucose, sucrose, and maltose?
- Myoglobin
- Amino acid
- Starch
- Haemoglobin
Answer: 3. Starch
Question 33. Glycogen and starch are
- Monosaccharides
- Disaccharides
- Oligosaccharides
- Polysaccharides
Answer: 4. Polysaccharides
Question 34. A starch molecule is formed by combining
- Glucose
- Maltose
- Galactose
- Lactose
Answer: 1. Glucose
West Bengal Board Class 9 Life Science Book Solution
Question 35. The monosaccharide present in glycogen is
- Fructose
- Cellulose
- Glucose
- Galactose
Answer: 3. Glucose
Question 36. In which organ is glucose stored as glycogen?
- Pancreas
- Liver
- Spleen
- Kidney
Answer: 2. Liver
Question 37. Which of the following carbohydrates can be not digested in the human intestine?
- Glycogen
- Cellulose
- Maltose
- Inulin
Answer: 2. Cellulose
Question 38. The walls of the xylem become rigid due to the presence of
- Glycogen
- Chitin
- Cellulose
- Lignin
Answer: 4. Lignin
Sample MCQs from WBBSE Class 9 Life Science
Question 39. The main component of plant cell wall is—
- Cellulose
- Glycogen
- Glucose
- Lipid and protein
Answer: 1. Cellulose
Question 40. The main component of fungal cell wall is—
- Inulin
- Chitin
- Cellulose
- Pectin
Answer: 2. Chitin
Question 41. Which of the following is known as animal starch?
- Glucose
- Cellulose
- Inulin
- Glycogen
Answer: 4. Glycogen
Question 42. The structural component of a simple protein molecule is—
- Peptide
- Peptone
- Amino acid
- Nucleic acid
Answer: 1. Peptide
Question 43. Which of the following compounds is essentially a protein structure?
- Hormone
- Enzyme
- Co-enzyme
- Prostaglandin
Answer: 2. Enzyme
Question 44. The two radicals present in protein molecules are—
- Amino and ketone
- Amino and carboxyl
- Carboxyl and aldehyde
- Aldehyde and ketone
Answer: 2. Amino and carboxyl
West Bengal Board Class 9 Life Science Book Solution
Question 45. Which of the following is a simple protein?
- Haemoglobin
- Nucleoprotein
- Glycoprotein
- Globulin
Answer: 4. Globulin
Question 46. The bond present in protein molecules is—
- Covalent bond
- Peptide bond
- Electrovalent bond
- Glycosidic bond
Answer: 2. Peptide bond
Question 47. Which of the following is produced after the hydrolysis of a polypeptide?
- Fatty acid
- Amino acid
- Lactic acid
- Nucleic acid
Answer: 2. Amino acid
Question 48. Which is not a conjugated protein?
- Proteose
- Nucleoprotein
- Metalloprotein
- Glycoprotein
Answer: 1. Proteose
Question 49. Haemoglobin is a—
- Simple protein
- Conjugated protein
- Derived protein
- Colloidal protein
Answer: 2. Conjugated protein
Question 50. The protein component of a hemoglobin molecule is
- Haem
- Globin
- Both
- None of these
Answer: 2. Globin
Question 51. The non-protein component of a hemoglobin molecule is
- Magnesium
- Calcium
- Copper
- Iron
Answer: 4. Iron
Question 52. Which of the following is not a fibrous protein?
- Haemoglobin
- Elastin
- Keratin
- Elastin
Answer: 2. Elastin
Question 53. Which has a close association with fibrous protein?
- Centrosome
- Golgi body
- Endoplasmic reticulum
- Mitochondria
Answer: 1. Centrosome
West Bengal Board Class 9 Life Science Book Solution
Question 54. Which is a chromoprotein?
- Gleadin
- Keratin
- Haemoglobin
- Elastin
Answer: 3. Haemoglobin
Question 55 An example of contractile protein is
- Keratin
- Collagen
- Haemoglobin
- Myosin
Answer: 4. Myosin
Question 56. One useful lipoprotein for humans is
- LDL
- HDL
- VLDL
- DL
Answer: 2. HDL
Question 57. Which of the following is a derived protein?
- Haemoglobin
- Albumin
- Globulin
- Peptone
Answer: 1. Haemoglobin
Question 58. The cell membrane is composed of
- Proteins and lipids
- Proteins and polysaccharides
- Proteins, lipids, and carbohydrates
- All of these
Answer: 1. Proteins and lipids
Question 59. Lipid is an
- Acidic compound
- Alcoholic compound
- Ester
- Aldehyde
Answer: 3. Ester
Question 60. The simple structural formula of lipids is
- C-ROOH
- R-CHO
- R-COOH
- R=CO
Answer: 3. R-COOH
Question 61. An essential component of lipids is—
- Nucleic acid
- Malic acid
- Fatty acid
- Amino acid
Answer: 3. Fatty acid
Question 62. The functional bond that helps to form a lipid molecule is—
- Ester bond
- Hydrogen bond
- Peptide bond
- Sulfide bond
Answer: 1. Ester bond
Question 63. The highest calorific value is seen in which of the following four nutrients?
- Protein
- Carbohydrate
- Fat
- Vitamin
Answer: 3. Fat
Chapter 2 Life Science Quiz Questions
Question 64. Wax is a type of—
- Carbohydrates
- Glycoproteins
- Lipids
- Lipoproteins
Answer: 2. Glycoproteins
Question 65. During hibernation, energy is supplied to the organism by—
- Carbohydrate
- Protein
- Vitamin
- Fat
Answer: 4. Fat
Question 66. DNA is a
- Single-stranded chain of nucleotides
- Double-stranded chain of polypeptides
- Double-stranded chain of nucleotides
- Double-stranded chain of amino acids
Answer: 3. Double-stranded chain of nucleotides
Question 67. In a DNA molecule, hydrogen bonding occurs between—
- Adenine and guanine
- Thymine and cytosine
- Adenine and cytosine
- Guanine and cytosine
Answer: 4. Guanine and cytosine
West Bengal Board Class 9 Life Science Book Solution
Question 68. The sugar present in DNA is—
- Triose
- Pentose
- Hexose
- Heptose
Answer: 2. Pentose
Question 69. Nitrogenous bases, present in both DNA and RNA, are—
- Adenine, guanine, cytosine
- Adenine, guanine, thymine
- Adenine, thymine, uracil
- Adenine, guanine, uracil
Answer: 1. Adenine, guanine, cytosine
Question 70. Which of the following carbohydrates is present in RNA?
- Ribulose
- Deoxyribose
- Ribose
- None of these
Answer: 3. Ribose
Chapter 2 Levels Of Organization Of Life Organic And Inorganic Molecules
Multiple Choice Questions
Question 1. Which of the following combinations of vitamins are fat soluble?
- Vit. A Vit. B and Vit. K
- D Vit. A Vit. B and Vit. C
- Vit. A Vit. D and Vit. E
- Vit. B, Vit. C and Vit. P
Answer: 3. Vit. A Vit. D and Vit. E
Question 2. Which combination includes all macroelements?
- Calcium, magnesium, and boron
- Sodium, potassium, and iodine
- Sodium, molybdenum, and iron
- Potassium, calcium, and phosphorus
Answer: 4. Potassium, calcium, and phosphorus
Question 3. A vitamin related to blood coagulation is
- Vit. A
- Vit. E
- Vit. D
- Vit. K
Answer: 4. Vit. K
Question 4. Which combination of vitamins and minerals is related to the formation of bones and teeth?
- Vit. A and phosphorus
- Vit. D and calcium
- Vit. C and calcium
- Vit. D and sodium
Answer: 2. Vit. D and calcium
Question 5. To get vitamin K, you will have to eat
- Guava
- Lettuce
- Butter
- Tomato
Answer: 2. Lettuce
Question 6. Pellagra is caused due to the deficiency of
- Vit. B6
- Vit. B5
- Vit. B3
- Vit. B12
Answer: 2. Vit. B5
Question 7. Pernicious anemia occurs due to a deficiency of
- Vit. B6
- Vit. B5
- Vit. B3
- Vit. B12
Answer: 4. Vit. B12
Question 8. Chlorosis in plants can be seen in the deficiency of
- Calcium
- Magnesium
- Oxygen
- Sodium
Answer: 2. Magnesium
Question 9. Name the vitamin that helps in developing immunity against common cough and cold.
- Retinol
- Pantothenic acid
- Ascorbic acid
- Calciferol
Answer: 3. Ascorbic acid
Question 10. Which of the following food items should one take to prevent xerophthalmia?
- Papaya
- Pulses
- Carrot
- Beans
Answer: 3. Carrot
Question 11. Which vitamin can reduce the chance of fetal death?
- Vit. B12
- Vit. E
- Vit. K
- Vit. B6
Answer: 2. Vit. E
Question 12. Which combination of elements is widely used in making fertilizers?
- N, C, H
- N, P, K
- N, Fe, Mg
- Mn, K, C
Answer: 2. N, P, K
Question 13. A microelement helping in the fixation and assimilation of nitrogen
- Molybdenum
- Magnesium
- Manganese
- Potassium
Answer: 1. Molybdenum
Question 14. The disease caused by a deficiency of iodine is
- Night blindness
- Beriberi
- Goitre
- Anaemia
Answer: 3. Goitre
Question 15. The provitamin of vitamin A is
- Beta carotene
- Retinol
- Calciferol
- Pyrithiamine
Answer: 1. Beta carotene
Study Tips for Class 9 Organic and Inorganic Molecules MCQs
Question 16. The contraction of muscles is controlled by
- Magnesium
- Calcium
- Phosphorus
- Iron
Answer: 2. Calcium
Question 17. Which of the following vitamins is insoluble in fat?
- Vitamin A
- Vitamin C
- Vitamin D
- Vitamin K
Answer: 2. Vitamin C
Question 18. Which of the following vitamins is insoluble in water?
- Vitamin C
- Vitamin P
- Vitamin M
- Vitamin E
Answer: 4. Vitamin E
Question 19. A water-soluble vitamin is
- Vitamin A
- Vitamin C
- Vitamin D
- Vitamin E
Answer: 2. Vitamin C
Question 20. The biomolecule that prevents the action of vitamins is called
- Pseudo vitamin
- Antivitamin
- Provitamin
- All of these
Answer: 2. Antivitamin
Question 21. Which of the following is an antivitamin?
- Galactoflavin
- Riboflavin
- Thiamin
- Cyanocobalamin
Answer: 1. Galactoflavin
Question 22. Vitamin A is produced in the liver from
- Ergosterol
- Avidin
- Carotene
- Citral
Answer: 3. Carotene
Question 23. 95% of vitamin A, absorbed in the human body is stored in
- Kidney
- Lungs
- Liver
- Stomach
Answer: 3. Liver
Question 24. The disease caused due to deficiency of vitamin A is
- Sterility
- Osteomalacia
- Rickets
- Night blindness
Answer: 4. Night blindness
Question 25. Xerophthalmia occurs due to a deficiency of vitamin
- C
- A
- E
- K
Answer: 2. A
Question 26. Osteomalacia is caused due to deficiency of
- Vitamin C
- Vitamin A
- Vitamin D
- Vitamin K
Answer: 3. Vitamin D
Question 27. Deficiency of which vitamin in children does result in rickets?
- Vit. D
- Vit. A
- Vit. C
- Vit. K
Answer: 1. Vit. D
Question 28. Tetany occurs due to a deficiency of
- Vitamin C
- Vitamin D
- Vitamin E
- Vitamin K
Answer: 2. Vitamin D
Question 29. The vitamin that is known as anti sterility factor is
- Calciferol
- Phylloquinone
- Tocopherol
- Retinol
Answer: 2. Tocopherol
Question 30. Which of the following vitamins is known as the ‘Antihaemorrhagic factor’?
- Vit. K
- Vit B5
- Vit. D
- Vit. C
Answer: 1. Vit B5
Question 31. Which vitamin does help in blood clotting?
- Vit. A
- Vit. D
- Vit. E
- Vit. K
Answer: 4. Vit. K
Question 32. Which vitamin does help in maintaining normal prothrombin levels in blood?
- Vit. K
- Vit. B
- Vit. B5
- Vit. C
Answer: 1. Vit. K
Question 33. Deficiency of which vitamin does result in pernicious anemia?
- Vit. B2
- Vit. B5
- Vit. B12
- Vit. B6
Answer: 3. Vit. B12
Question 34. PP factor is
- Vit. A
- Vit. B12
- Vit. D
- Vit. B3
Answer: 4. Vit. B3
Question 35. Megaloblastic anemia occurs deficiency of
- Pyridoxine
- Folic acid
- Niacin
- Biotin
Answer: 2. Folic acid
Question 36. Deficiency of which vitamin does cause beriberi?
- Vit. B1
- Vit B2
- Vit B5
- Vit. B12
Answer: 1. Vit. B1
Question 37. The chemical name of vitamin B1 is
- Niacin
- Thiamin
- Pyridoxine
- Riboflavin
Answer: 2. Thiamin
Question 38. The chemical name of vitamin C is
- Tocopherol
- Ascorbic acid
- Retinol
- Thiamine
Answer: 2. Ascorbic acid
Question 39. The disease that is caused due to deficiency of vitamin C is
- Rickets.
- Osteomalacia
- Scurvy
- Beriberi
Answer: 3. Scurvy
Question 40. Biotin was previously known as
- Vitamin G
- Vitamin H
- Vitamin M
- Vitamin K
Answer: 2. Vitamin H
Question 41. Which of the following sets of vitamins are antioxidants?
- B1,B6, B12
- A, E, C
- D, K, B2
- B1, B5, B6
Answer: 2. A, E, C
Question 42. One macro-element for the human body is
- Zn
- Cu
- Ca
- Cr
Answer: 3. Ca
Question 43. Which one of the following is a microelement?
- N
- P
- K
- Mo
Answer:
4. Mo
Question 44. Which one is required for blood coagulation?
- P
- K
- Na
- Ca
Answer: 4. Ca
Question 45. The disease caused in animals due to deficiency of iodine is
- Night blindness
- Beriberi
- Goiter
- Anaemia.
Answer: 3. Goiter
Question 46. Helps in the synthesis of thyroxine
- Ca
- K
- P
- I
Answer: 4. 1
Question 47. Which mineral helps in hemoglobin?
- Calcium
- Potassium
- Magnesium
- Iron
Answer: 4. Iron
Question 48. Deficiency of which mineral element does result in anemia?
- Magnesium
- Iron
- Calcium
- Phosphorus
Answer: 2. Iron
Question 49. Which mineral does help in the transmission of nerve impulses and contraction of heart muscles?
- Sodium
- Iron
- Copper
- Iodine
Answer: 1. Sodium