NEET · Biology · STD 12 - 12. ecosystem

Which of the following is a primary consumerin maize field ecosystem ?

A Grasshopper
B Wolf
C Phytoplankton
D Lion

Verified Solution

Answer & Solution

Correct Answer

(A) Grasshopper

Step-by-step Solution

Detailed explanation

(a) : Primary consumers are herbivorous organisms that feed on producers. Carnivores are termed secondary, tertiary etc., consumers depending upon their position in food chain. In food chain on land, grasshopper is a herbivore (primary consumer) while wolf and lion are carnivores. Phytoplanktons are producers in aquatic food chains.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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List \(I\)	List \(II\)
\(A\). Rhizopus	\(I\). Mushroom
\(B\). Ustilago	\(II\). Smut fungus
\(C\). Puccinia	\(III\). Bread mould
\(D\). Agaricus	\(IV\). Rust fungus

	LIST - I		LIST - II
A.	Head	(i)	Enzymes
B.	Middle piece	(ii)	Sperm motility
C.	Acrosome	(iii)	Energy
D.	Tail	(iv)	Genetic material