Ecosystem Mock Tests

24 questions available

Ecosystem Mock Test 1

Questions: 24

Sample Questions

Class 12 Biology

In a food chain, the type of ecological pyramid that is always upright is:

A Pyramid of numbers

B Pyramid of biomass

C Pyramid of energy

D All types of ecological pyramids are always upright

Class 12 Biology

Decomposition of organic matter is faster in materials rich in:

A Sugars and nitrogenous compounds

B Lignin and cutin

C Cellulose alone

D Chitin from fungal cell walls

Class 12 Biology

In a xerosere (ecological succession on dry habitats), the typical sequence of plant communities is:

A Lichen crust → moss stage → annual herb stage → perennial herb stage → shrub stage → forest climax

B Moss stage → lichen crust → shrub stage → annual herb stage → forest climax → perennial herb stage

C Perennial herb stage → annual herb stage → lichen crust → moss stage → forest climax → shrub stage

D Shrub stage → forest climax → lichen crust → moss stage → annual herb stage → perennial herb stage

Class 12 Biology

In a food chain, only about 10% of the energy is transferred from one trophic level to the next. The remaining energy is primarily:

A Stored as fat in the organism's body tissues

B Lost as heat during metabolic processes such as respiration

C Recycled back to the sun through decomposition

D Used by the organism for growth and reproduction only

Class 12 Biology

In the process of decomposition of organic matter, which group of organisms plays the most critical role in breaking down complex organic material into simpler inorganic substances:

A Herbivores

B Decomposers (fungi and bacteria)

C Detritivores (earthworms)

D Primary producers

Class 12 Biology

Energy flow in an ecosystem is described as unidirectional because:

A Energy is lost as heat at each trophic level and cannot be recycled by organisms

B Decomposers break down organic matter and return energy to producers

C Primary consumers always receive more energy than secondary consumers

D Solar energy is the only source of energy for all ecosystems

Class 12 Biology

Which of the following ecological pyramids always has a upright shape, regardless of the ecosystem type?

A Pyramid of numbers

B Pyramid of biomass

C Pyramid of energy

D Pyramid of abundance

Class 12 Biology

Nitrogenase, the enzyme responsible for biological nitrogen fixation, is sensitive to:

A Oxygen, which is why nitrogen-fixing organisms employ mechanisms like leghaemoglobin or specialized cells (heterocysts) to protect it

Ecosystem Mock Tests

Ecosystem Mock Test 1

Sample Questions

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