MCQ ON ECOSYSTEM - STRUCTURE AND FUNCTION class 12 for NEET

MCQ ON ECOSYSTEM – STRUCTURE AND FUNCTION class 12 for NEET | ECOSYSTEM- STRUCTURE AND FUNCTION class 12 | MCQ ECOSYSTEM – STRUCTURE AND FUNCTION with Answer | Check the below NCERT MCQ question for class 12 Biology based on the with Answers.

MCQ ON ECOSYSTEM – STRUCTURE AND FUNCTION class 12 for NEET

MCQ on ECOSYSTEM – STRUCTURE AND FUNCTION class 12 Biology with answers were prepared based on the latest pattern.We have provided class 12 Biology MCQs questions on ECOSYSTEM- STRUCTURE AND FUNCTION with Answers to help students understand the concept very well.

MCQ ON ECOSYSTEM – STRUCTURE AND FUNCTION is useful for NEET / CSIR / UGC / CBSE / ICSE / AIIMS / EXAM / AFMC EXAM / STATE LEVEL MEDICAL EXAM 2022-23, 2023-24

Introduction:
An ecosystem can be visualised as a functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment. Ecosystem varies greatly in size from a small pond to a large forest or sea. Main ecologist regard the entire biosphere is a global ecosystem is a composite of all local ecosystem on earth. This system is too much big and complex to be studied at one time it is convenient to divide it into two basic categories namely the terrestrial and aquatic. Forest ,grassland and desert are some examples of terrestrial ecosystems, pond, lake , wetland, river and estuary are some examples of aquatic ecosystems.Crop fields and an aquarium may also be considered as man – made ecosystems. We will look at the structure of the ecosystem, in order to appreciate the input ( productivity) , transfer of energy ( food chain/web, nutrient cycling ) and the output ( degradation and energy loss) .

MCQ ON ECOSYSTEM – STRUCTURE AND FUNCTION class 12 for NEET

1. Vertical distribution of different species occupying different levels is called

(a) Commensalism
(b) Protocooperation
(c) Mutualism
(d) stratification

Ans (d) stratification

2. The component of ecosystems are seen to function as a unit when you considered a following aspects

(a) productivity
(b) decomposition
(c) energy flow and nutrient cycling
(d) all the above

Ans. (d) all the above

3. The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis .

(a) primary production
(b) Gross primary productivity
(c) secondary productivity
(d) Protoco-operation

Ans. (a) primary production

4. Gross primary productivity minus respiration losses (R) is the

(a) net primary productivity (NPP)
(b) GPP
(c) decomposition
(d) respiration

Ans.(a) NPP

5.The rate of biomass production is called

(a) Symbiosis
(b) gross primary productivity
(c) productivity
(d) Commensalism

Ans.(c) productivity

6. The rate of production of organic matter during photosynthesis

(a) Gross primary productivity
(b) Net primary productivity
(c) secondary productivity
(d) decomposition

Ans.(a) Gross primary productivity

7. The available biomass for the consumption to heterotrophs .

(a) Net primary productivity
(b) Secondary productivity
(c) Symbiosis
(d) decomposition

Ans.(a) Net primary productivity

8. The rate of formation of new organic matter by consumers

(a) net primary productivity
(b) secondary productivity
(c) Gross primary productivity
(d) all the above

Ans.(b) secondary productivity

9. Primary productivity depends on the plant species

(a) inhibiting a particular area
(b) environmental factors
(c) availability of nutrients and photosynthetic capacity of plants
(d) all the above

Ans. (d) all the above

10. The annual net primary productivity of whole biosphere is approximately

(a) 170 billions tons
(b) 180 billions tons
(c) 190 billions tons
(d) 200 billions tons

Ans. (a) 170 billions tons

11. The process of breakdown complex organic matter into inorganic substances like carbon dioxide , water and nutrients and the process called

(a) decomposition
(b) detritivores
(c) Parasitism
(d) Predatorship

Ans.(a) decomposition

12. The important steps in the process of decomposition are

(a) fragmentation, leaching, catabolism, humification and catabolism.
(b) leaching, anabolism, fragmentation,
(c) Symbiosis, predator, parasitism
(d) Commensalism, parasitism, Predation

Ans . (a) fragmentation, leaching, catabolism, humification and mineralisation.

13. Earthworm breakdown detritus into smaller particles this process is called

(a) fragmentation
(b) leaching
(c) catabolism
(d) humification

Ans.(a) fragmentation

14. Bacterial and fungal enzyme degrade detritus into simple inorganic substances , this process is called

(a) anabolism
(b) catabolism
(c) fragmentation
(d) leaching

Ans. (b) catabolism

15. All the steps in decomposition operate simultaneously on the detritus are

(a) fragmentation, leaching, catabolism
(b) humification and mineralisation
(c) fragmentation, leaching
(d) humification and mineralisation

Ans.(b) humification and mineralisation

16. Himification and minilization occur during decomposition in the

(a) water
(b) soil
(c) air
(d) all the above