In a food chain, the first trophic level is always occupied by: MCQ with Answer and Explanation

In a food chain, the first trophic level is always occupied by:
A. Herbivores
B. Decomposers
C. Carnivores
D. Producers (Green plants)
Answer: Option D
Solution (By JKSSB Mock Tests)
A food chain represents the flow of energy and nutrients. The first trophic level is always occupied by producers (autotrophs), primarily green plants and algae, which convert solar energy into chemical energy via photosynthesis. The second level is primary consumers (herbivores), the third is secondary consumers (carnivores), and so on.

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Practice More Biology Questions

Question #1
Thyroxine, secreted by the thyroid gland, primarily regulates:
A. Blood sugar levels
B. Blood calcium levels
C. Basal metabolic rate (BMR)
D. Water balance in the body

Correct Answer: Option C


Explanation:
Thyroxine (T4) and Triiodothyronine (T3) are the main hormones secreted by the thyroid gland. They play a crucial role in regulating the basal metabolic rate (BMR), which is the rate at which the body uses energy at rest. They also influence growth, development, and body temperature. Calcitonin, also from the thyroid, regulates blood calcium.

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Question #2
The disease that is caused by a deficiency of niacin is:
A. Pellagra
B. Beriberi
C. Rickets
D. Scurvy

Correct Answer: Option A


Explanation:
Pellagra, with the 3 Ds (dermatitis, diarrhea, dementia), is due to deficiency of niacin (vitamin B₃) or tryptophan. Beriberi is B₁, scurvy C, rickets D. Niacin is part of NAD and NADP.

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Question #3
Which of the following statements about ecological pyramids is correct?
A. The pyramid of energy can be inverted.
B. The pyramid of energy is always upright.
C. The pyramid of biomass is always upright in terrestrial ecosystems.
D. The pyramid of numbers is always upright.

Correct Answer: Option B


Explanation:
Energy pyramids are always upright because energy decreases at higher trophic levels. Pyramids of numbers and biomass can be inverted (e.g., tree ecosystem, aquatic).

This question belongs to: Science Biology