Which of the following is a biopesticide? MCQ with Answer and Explanation

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Which of the following is a biopesticide?

A. Malathion

B. Bacillus thuringiensis

C. DDT

D. Lindane

Answer: Option B

Solution (By JKSSB Mock Tests)

Bacillus thuringiensis (Bt) is a bacterium producing crystal (Cry) proteins toxic to specific insect larvae, used as a biological insecticide. DDT, malathion, and lindane are synthetic chemical pesticides. Biopesticides are eco-friendly, target-specific, and biodegradable. Bt formulations are used in organic farming. The cry gene is also used in GM crops like Bt cotton.

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Question #1

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Consider the following statements about hormones:
1. Insulin is a peptide hormone.
2. Thyroxine is an amino acid derivative.
3. Cortisol is a steroid hormone.
Which of the above is/are correct?

A. 1, 2, and 3

B. 2 and 3 only

C. 1 and 2 only

D. 1 and 3 only

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Correct Answer: Option A

Explanation:
Insulin is a peptide, thyroxine derived from tyrosine, cortisol a steroid. All three classifications are correct.

This question belongs to: Science Biology

Question #2

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The term for the water vapor loss from plant leaves is:

A. Condensation

B. Evaporation

C. Guttation

D. Transpiration

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Correct Answer: Option D

Explanation:
Transpiration is the loss of water in the form of vapor from the aerial parts of plants, mainly through stomata. Evaporation is from any surface, guttation is liquid water loss, condensation is vapor to liquid.

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Question #3

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In a monohybrid cross between two heterozygous pea plants (Tt), the phenotypic ratio of tall to dwarf in the offspring is expected to be:

A. 9:3:3:1

B. 1:1

C. 3:1

D. 1:2:1

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Correct Answer: Option C

Explanation:
When both parents are heterozygous (Tt × Tt), the offspring genotypes are TT (25%), Tt (50%), and tt (25%). Since tall (T) is dominant over dwarf (t), both TT and Tt are tall, resulting in 3 tall : 1 dwarf phenotypic ratio. The genotypic ratio is 1:2:1. 9:3:3:1 is the dihybrid phenotypic ratio. 1:1 ratio is seen in test cross (Tt × tt).

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