NEET Foundation-Zoology-Ecology and Environment Test-9 - Mahatmaacademy.com

NEET Foundation-Zoology-Ecology and Environment Test-9

NEET Foundation-Zoology-Ecology and Environment Test-9

1. Correct food chain among the following is

 
 
 
 

2. Study the following
a) In a terrestrial ecosystem feeding relation-ships are always simple with linear trophic levels.
b) Sun is not the source for energy in hydro-thermal ecosystems.
c) The biomass of a trophic level at a particular time is called standing crop.
The correct ones of the above are

 
 
 
 

3. Assertion (A): Cave dwelling animals develop pigmentation on exposure to light
Reason (R): Light induces pigmentation.

 
 
 
 

4. Assertion (A) : Eltonian pyramid of energy is always inverted
Reason (R): Energy flows from a particular trophic level to the next highertrophic level

 
 
 
 

5. Assertion (A) : Standing crop is measured as the mass of living organism (biomass) or as the number of organisms per unit area
Reason (R): The biomass of a species is expressed in terms of wet weight and not related to numbers

 
 
 
 

6. Assertion (A): The food chain in an ecosystem is never that simple and interrelationships become more complex
Reason (R): The natural interconnections of food chains forms a network called ‘food webs’

 
 
 
 

7. Assertion (A) : All the interactions in an ecosystem are not explained by ecological pyramids.
Reason (R): Ecological pyramids do not accommodate saprophytes and omnivores.

 
 
 
 

8. Assertion (A): Warm and moist environment can enhance the rate of decomposition
Reason (R): Warm and moist climate leads to create anaerobic condition which promotes decomposition.

 
 
 
 

9. Assertion (A) : Detritus food chain begins with detritus.
Reason (R) : Detritivores like fungi and bacteria are major decomposers in such food chains.

 
 
 
 

10. Assertion (A) : Ecological pyramids cannot explain all the vital functions of any ecosystem.
Reason (R) : Ecological pyramids actually do not explain the role of organisms working at more than one trophic levels.

 
 
 
 

11. Identify the possible like ,A, in the following food chain Plant —> insect —> frog —>,A, —> eagle

 
 
 
 

12. Which one of the following is not a functional unit of an ecosystem?

 
 
 
 

13. Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?

 
 
 
 

14. Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?

 
 
 
 

15. Mass of living matter at a trophic level in an area at any time is called

 
 
 
 

16. The biomass available for consumption by the herbivores and the decomposers is called

 
 
 
 

17. Study the four statements (i-iv) given below and select the two correct ones out of them
i) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers
ii) Predator star fish Pisaster helps in maintaining species diversity of some invertebrates
iii) Predators ultimately lead to the extinction of prey species
iv) Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders
The two correct statements are

 
 
 
 

18. Which one of the following types of organisms occupy more than one trophic level in a pond’ ecosystem?

 
 
 
 

19. Consider the following statements concerning food chains
a) removal of 80% tigers from an area resulted in greatly increases growth of vegetation
b) removal of most of the carnivores resulted in an increased population of deers
c) the length of food chains is generally limited to 3-4 trophic levels due to energy loss
d)the length of food chains may vary from 2 to 8 trophic levels
Which two of the above statements are correct?

 
 
 
 

20. The slow rate of decomposition of fallen logs in nature is due to their