Ecosystem — Page 6 | NEET Biology

Q51

Which one of the following is not used for construction of ecological pyramids?

A Number of individuals

B Rate of energy flow

C Fresh weight

D Dry weight

Correct Answer

Option C

Solution

(c) Fresh weight is not used because it varies with water content and does not accurately reflect energy.

Q52

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

A Sparrow

B Lion

C Goat

D Frog

Correct Answer

Option A

Solution

(a) Sparrow eats grains (primary consumer) and insects (secondary consumer) simultaneously.

Q53

Which one of the following statements for pyramid of energy is incorrect?

A Its base is broad

B It shows energy content of different trophic level organisms

C It is inverted in shape

D It is upright in shape

Correct Answer

Option C

Solution

(c) Pyramid of energy is always upright — energy decreases at successive trophic levels. It can never be inverted.

Q54

Which one of the following is not a function of an ecosystem?

A Energy flow

B Decomposition

C Productivity

D Stratification

Correct Answer

Option D

Solution

(d) The four functions of an ecosystem are productivity, decomposition, energy flow, and nutrient cycling.

Stratification is a structural feature, not a function.

Q55

Identify the possible link A in the food chain: Plant-insect-frog-A-Eagle

A Rabbit

B Wolf

C Cobra

D Parrot

Correct Answer

Option C

Solution

(c) Cobra feeds on frogs and is itself eaten by eagles.

Q56

Pheretima and its close relatives derive nourishment from

A sugarcane roots

B decaying fallen leaves and soil organic matter.

C soil insects

D small pieces of fresh fallen leaves of maize, etc.

Correct Answer

Option B

Solution

(b) Earthworm is a detritivore — feeds on decaying organic matter.

Q57

When man eats fish which feeds on zooplankton which have eaten small plants, the producer in the chain is

A Zooplankton

B Small plants

C Fish

D Man

Correct Answer

Option B

Solution

(b) Small plants (phytoplankton) are the producers; they photosynthesize.

Q58

Which one of the following is a primary consumer in maize field ecosystem?

A Lion

B Grasshopper

C Wolf

D Phytoplankton

Correct Answer

Option B

Solution

(b) Grasshopper is the primary consumer (herbivore) in the maize field ecosystem.

Q59

A community of individuals of different species living in the same habitat and having functional interactions is:

A Biotic community

B Ecosystems

C Population

D Ecological niche

Correct Answer

Option A

Solution

(a) Biotic community is an association of individuals of different species living in the same habitat and showing functional interactions.

Q60

The average efficiency of energy transfer from herbivores to carnivores is

A 5%

B 10%

C 25%

D 50%

Correct Answer

Option B

Solution

(b) 10% law (Lindemann): only 10% of energy is transferred from one trophic level to the next.