Chapter 5 Environment And Its Resources Ecology And Ecological Organization Multiple Choice Questions
Question 1. Branch of science dealing with the interrelation of a species and its environment is—
- Autecology
- Synecology
- Community biology
- Population biology
Answer: 1. Autecology
Question 2. Synecology deals with —
- A single individual
- A population
- A community
- Different ecosystems
Answer: 3. A community
Question 3. At which level of ecology would you explain the event of change in body color of an animal with the change in intensity of light?
- Individual level
- Population level
- Community level
- Ecosystem level
Answer: 1. Individual level
Read and Learn More WBBSE Class 9 Life Science MCQs
Question 4. Synthesis of chlorophyll in green plants is controlled by—
- Relative humidity
- Atmospheric pressure
- Temperature
- Light
Answer: 4. Light
Question 5. The similarity amongst chlorophyll production, transpiration rate and opening of stomata is that—
- All are involved in growth of plants
- All are light dependent events
- All increase weight of plant body
- All decrease weight of plant body
Answer: 2. All are light dependent events
Question 6. All the plants and animals together of a particular area are called—
- Ecotone
- Biome
- Biota
- Echod
Answer: 3. Biota
WBBSE Class 9 Ecology MCQs
Question 7. Absorption of water by plants is related to—
- Water content of soil
- Chlorophyll concentration
- Plant height
- Starch content of cells
Answer: 1. Water content of soil
Question 8. Xerophytes have—
- Thick cuticle cover
- Less stomata
- Thick stem hair
- All of these
Answer: 4. Thick stem hair
Question 9. Zooplanktons come to the surface in day light and go to the bottom at night, this is—
- Circadian rhythm
- Diurnal rhythm
- Photoperiodism
- Phototactic movement
Answer: 1. Circadian rhythm
Question 10. Heliophytes are adapted to—
- Saline soil
- Saline water
- Bright sunlight
- Low sunlight
Answer: 3. Bright sunlight
Key MCQs on Ecological Organization for Class 9
Question 11. Population interaction is discussed under—
- Population level
- Community level
- Ecosystem level
- Individual level
Answer: 2. Community level
Question 12. Rate of metabolism increases in—
- Low temperature
- Higher temperature
- Low humidity
- High CO2
Answer: 2. Higher temperature
Question 13. A growing population shows—
- Low natality
- High mortality
- Low natality and emigration
- Low mortality and immigration
Answer: 4. Low mortality and immigration
Question 14. ‘S’ shaped growth curve is seen in—
- Newly built ant population
- Stable human population
- Honey bee population
- Wasp population
Answer: 2. Stable human population
Practice MCQs for Chapter 5 Ecology – A set of practice multiple
Question 15. High natality and immigration—
- Increase population size
- Decrease population size
- Do not change population size
- None of these
Answer: 1. Increase population size
Question 16. If B= Birth rate, N= Total number of individuals in a population and nb= Number of live birth, the equation for birth rate will be—
- N= \(\frac{nb}{B}\)
- B= \(\frac{nb}{N}\)
- B= N * nb
- B= \(\frac{N}{nb}\)
Answer: 2. B= \(\frac{nb}{N}\)
Question 17. Size of population remains unchanged if—
- Emigration = Immigration
- Natality > Mortality
- Immigration * Emigration
- All of these
Answer: 1. Emigration = Immigration
Question 18. Population size decreases with—
- Emigration
- Immigration
- Low mortality
- High natality
Answer: 1. Emigration
Question 19. A positive interspecific interaction is—
- Mutualism
- Parasitism
- Predation
- Cannibalism
Answer: 1. Mutualism
Important Questions on Ecosystems for Class 9
Question 20. Population size does not depend upon—
- Migration
- Natality
- Emigration
- Species interaction
Answer: 4. Species interaction
Question 21. High rate of predation results in—
- Decline in primary consumer
- Increase in primary consumer
- Decrease in higher level of consumer
- Decline in producer
Answer: 1. Decline in primary consumer
Question 22. In which of the following interactions, involved members keep very close contact?
- Competition
- Parasitism
- Predation
- None of these
Answer: 2. Parasitism
Question 23. What is ‘+ +’ interaction?
- Autotrophism
- Parasitism
- Symbiosis
- Predation
Answer: 3. Symbiosis
Question 24. Which of the following is a topographic factor of ecosystem?
- Brightness of light
- Wind speed
- Slope of hills
- Waves of sea
Answer: 3. Slope of hills
Concepts Related to Ecology for MCQs
Question 25. Animals that maintain constant body temperature in any environment are called—
- Poikilothermic animals
- Homeothermic animals
- Eurythermal animals
- Stenothermal animals
Answer: 2. Homeothermic animals
Question 26. Example of stenothermal animals is—
- Birds
- Toads
- Ants
- Fishes
Answer: 4. Fishes
Question 27. Which of the following is an example of obligate parasite?
- Round worm
- Mosquito
- Louse
- Ticks
Answer: 1. Round worm
Question 28. Which of the following is not an abiotic factor?
- Water
- Soil
- Plants
- Air
Answer: 3. Plants
Question 29. Global ‘sink’ for CO2 is
- Tropical rain forest
- Mangrove
- Ocean
- Coral reef
Answer: 3. Ocean
Sample MCQs from WBBSE Class 9 Life Science Chapter 5
Question 30. Which ecosystem has the highest primary productivity?
- Pond
- Ocean
- Desert
- Forest
Answer: 2. Ocean
Question 31. The most recently discovered ecosystem is—
- Vent*
- Crater
- Floating iceberg
- Coral reef
Answer: 1. Vent*
Question 32. Niche of a species is—
- Place of living
- Specific function
- Habitat and specific function
- None of these
Answer: 3. Habitat and specific function
Question 33. Which one of the following is mismatched?
- Deciduous forest: Shorea robusta
- Evergreen forest: Pinus roxburghii
- Xeric forest: Musa paradisica
- Mangrove forest: Barringtonia acutangula
Answer: 3. Xeric forest: Musa paradisica
Question 34. Insectivorous plants are—
- Organotrophs
- Autotrophs
- Heterotrophs
- Partial heterotrophs
Answer: 4. Partial heterotrophs
Question 35. Which of the following levels is not studied in synecology?
- Individual level
- Population level
- Community level
- Ecological level
Answer: 1. Individual level
Question 36. In ecology, interaction and organization among different organisms is studied in steps.
- 2
- 3
- 4
- 5
Answer: 3. 4
Question 37. Which of the following is a long day plant?
- pea
- Cosmos
- Strawberry
- Dahlia
Answer: 1. pea
Question 38. Which of the following is a short day plant?
- Pea
- Dahlia
- Clover
- Radish
Answer: 2. Dahlia
Question 39. Chlorophyll synthesis in plants is regulated by—
- Humidity
- Wind
- Temperature
- Light
Answer: 4. Light
Question 40. Melanin formation in human skin is regulated by—
- Humidity
- Light
- Temperature
- Pressure
Answer: 2. Light
Question 41. Migration of salmon, eel fish is regulated by—
- Water
- Humidity
- Temperature.
- Light
Answer: 3. Temperature.
Question 42. Temperature affects the size of an organism. This is known as—
- Bergmann’s rule
- Gloger’s rule
- Allen’s rule
- Lindeman’s law
Answer: 1. Bergmann’s rule
Question 43. Higher humidity makes the body colour of animals darker. This is known as—
- Bergmann’s rule
- Gloger’s rule
- Allen’s rule
- Lindeman’s law
Answer: 2. Gloger’s rule
Question 44. Animals of polar region have smaller pina, tail and limbs. This is known as—
- Bergmann’s rule
- Gloger’s rule
- Allen’s rule
- Lindeman’s law
Answer: 3. Allen’s rule
Chapter 5 Life Science Quiz Questions on Ecology
Question 45. The physiological reaction of organisms depending upon the length of day or night, is called—
- Photosynthesis
- Photoperiodism
- Photorespiration
- None of these
Answer: 2. Photoperiodism
Question 46. The act of leaving one’s native place permanently with the intent to reside somewhere else, is called—
- Adaptation
- Immigration
- Emigration
- Extinction
Answer: 3. Emigration
Question 47. Example of l+ O’ interaction is—
- Autotrophism
- Mutualism
- Parasitism
- Commensalism
Answer: 4. Parasitism
Question 48. All the plant species of an ecosystem is collectively known as—
- Flora
- Fauna
- Biome
- Biomass
Answer: 1. Flora
Question 49. All the animal species of an ecosystem is collectively known as—
- Flora
- Fauna
- Biome
- Biomass
Answer: 2. Fauna
Question 50. Number of trophic levels in a food chain ranges from—
- 14-16
- 11-13
- 7-10
- 3-5
Answer: 4. 3-5
Question 51. Lindeman law of energy flow through different trophic levels in an ecosystem is also known as—
- 5% law
- 7% law
- 10% law
- 15% law
Answer: 3. 10% law
Question 52. Which of the following is a grazing food chain?
- Organic matter → Earthworm → Bacteria
- Plant → Human → Worm
- Decaying organic matter → Zooplankton → Small fish → Large fish
- Grass → Grasshopper → Frog → Snake → Hawk
Answer: 4. Grass → Grasshopper → Frog → Snake → Hawk
Question 53. Actively swimming aquatic organisms in a water body are called—
- Necton
- Benthos
- Plankton
- Neuston
Answer: 1. Necton
Question 54. Food chain was scientifically described in 1966 by scientist—
- Tansley
- Lindeman
- Odum
- Flaeckel
Answer: 3. Odum
Study Tips for Class 9 Ecology MCQs
Question 55. The community of organisms, that reside on or near the seabed is called—
- Necton
- Plankton
- Benthos
- Neuston
Answer: 3. Benthos
Question 56. The largest consumer population of marine ecosystem belongs to—
- Primary consumer
- Secondary consumer
- Tertiary consumer
- Topmost level of consumers
Answer: 1. Primary consumer
Question 57. Photoperiodism is a—
- Biochemical process
- Biophysical process
- Physiological process
- All of these
Answer: 3. Physiological process
Question 58. Man is—
- Autotroph
- Omnivorous
- Carnivorous
- Herbivorous
Answer: 2. Omnivorous
Question 59. If different trophic levels are piled one upon another, we shall get—
- Food chain
- Food web
- Food pyramid
- Energy pyramid
Answer: 3. Food pyramid
Question 60. Which of the following is a component of macronutrient cycle?
- Na
- Mn
- Cu
- O2
Answer: 4. O2
Question 61. Which of the following is a component of micronutrient cycle?
- Cu
- C
- H2
- O2
Answer: 1. Cu
Question 62. Inhabitance of Anabaena in the leaf tissue of Azolla is an example of— .
- Competition
- Predation
- Symbiosis
- Commensalism
Answer: 3. Symbiosis
Question 63. In an interspecific relation, one of the two species is benefited but another one is neither benefited nor harmed. This interaction is called—
- Symbiosis
- Mutualism
- Commensalism
- Parasitism
Answer: 3. Commensalism
Question 64. Certain bacteria break organic molecules and return elementary components to nature, these, bacteria are treated as—
- Decomposers
- Putrifying bacteria
- Transducers
- Transformers
Answer: 4. Transformers
Question 65. Unit of a population is—
- A community
- An animal species
- A plant species
- An individual of a species
Answer: 4. An individual of a species
Question 66. Unit of a community is—
- An individual of a species
- A plant species
- An animal species
- A Population
Answer: 4. A Population
Question 67. The largest population in an ecosystem is seen amongst—
- Decomposers
- Producers
- Primary consumers
- Secondary consumersintra
Answer: 2. Producers