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Question (11)

QN0036132

A Hydra produces a small outgrowth at one particular location. The outgrowth enlarges and later separates from the parent. Which sequence is correct?

(A) Fragmentation → fusion → separation
(B) Repeated cell division → bud formation → maturation → detachment
(C) Meiosis → pollination → detachment
(D) Multiple fission → spore formation → maturation

Correct Answer: B

Explanation:

Hydra reproduces by budding through repeated cell division at a specific site.

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Question (12)

QN0036133

A farmer wants to produce many genetically similar rose plants rapidly and wants them to flower earlier than seed-grown plants. Which method is suitable?

(A) Cross-pollination
(B) Vegetative propagation
(C) Multiple fission
(D) Spore formation

Correct Answer: B

Explanation:

Vegetative propagation produces genetically similar plants and may result in earlier flowering.

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Question (13)

QN0036134

A Bryophyllum leaf falls on moist soil. Small structures along its margins begin developing into new plants. Which part is responsible?

(A) Ovules
(B) Pollen grains
(C) Buds in the leaf notches
(D) Spores in sporangia

Correct Answer: C

Explanation:

Bryophyllum produces buds in the notches along its leaf margins.

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Question (14)

QN0036135

In tissue culture, a small group of cells called callus is first produced. What happens next?

(A) It is immediately converted into pollen
(B) It is transferred to a hormone-containing medium for growth and differentiation
(C) It undergoes fertilisation
(D) It is converted into spores

Correct Answer: B

Explanation:

The callus is transferred to another medium containing hormones for growth and differentiation.

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Question (15)

QN0036136

Why can spores of Rhizopus remain protected until suitable conditions are available?

(A) They have a thick protective wall
(B) They contain no genetic material
(C) They are surrounded by a fruit
(D) They are produced inside flowers

Correct Answer: A

Explanation:

Rhizopus spores have thick walls that protect them until suitable moist conditions are available.

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Question (16)

QN0036137

A gardener wants to multiply a plant that has lost its ability to produce viable seeds. Which reasoning supports vegetative propagation?

(A) It requires formation of pollen grains
(B) It can produce new plants from vegetative parts such as roots, stems or leaves
(C) It always requires two parents
(D) It can occur only through fertilisation

Correct Answer: B

Explanation:

Vegetative propagation produces new plants from roots, stems or leaves without seed formation.

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Question (17)

QN0036138

Consider the following observations: P: A single parent is sufficient. Q: Gametes from two individuals combine. R: Greater combinations of existing variations can be generated. S: New individuals are generally produced through a single reproductive cell type. Which combination is most closely associated with sexual reproduction?

(A) P and S only
(B) Q and R only
(C) P and Q only
(D) P, R and S

Correct Answer: B

Explanation:

Sexual reproduction combines DNA from two individuals and generates new combinations of variations.

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Question (18)

QN0036139

Suppose an organism normally has 20 chromosomes in its body cells. If its reproductive cells are produced with half the chromosome number, how many chromosomes would each reproductive cell contain?

(A) 5
(B) 10
(C) 20
(D) 40

Correct Answer: B

Explanation:

Reproductive cells contain half the chromosome number of body cells, so 20 ÷ 2 = 10.

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Question (19)

QN0036140

Two reproductive cells, each containing 10 chromosomes, fuse. What chromosome number would be restored in the resulting zygote, assuming the normal condition is maintained?

(A) 5
(B) 10
(C) 20
(D) 40

Correct Answer: C

Explanation:

Fusion combines 10 chromosomes from each gamete, giving 10 + 10 = 20 chromosomes.

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Question (20)

QN0036141

Why would direct fusion of two body cells with the full chromosome number be problematic if the chromosome number doubled in every generation?

(A) DNA would disappear completely
(B) The DNA content would progressively increase and interfere with cellular control
(C) Cells would stop containing proteins
(D) Reproduction would become asexual

Correct Answer: B

Explanation:

Meiosis prevents chromosome number and DNA content from doubling in every generation.

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Question (11)

A Hydra produces a small outgrowth at one particular location. The outgrowth enlarges and later separates from the parent. Which sequence is correct?

Explanation:

Link:

Question (12)

A farmer wants to produce many genetically similar rose plants rapidly and wants them to flower earlier than seed-grown plants. Which method is suitable?

Explanation:

Link:

Question (13)

A Bryophyllum leaf falls on moist soil. Small structures along its margins begin developing into new plants. Which part is responsible?

Explanation:

Link:

Question (14)

In tissue culture, a small group of cells called callus is first produced. What happens next?

Explanation:

Link:

Question (15)

Why can spores of Rhizopus remain protected until suitable conditions are available?

Explanation:

Link:

Question (16)

A gardener wants to multiply a plant that has lost its ability to produce viable seeds. Which reasoning supports vegetative propagation?

Explanation:

Link:

Question (17)

Explanation:

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Question (18)

Suppose an organism normally has 20 chromosomes in its body cells. If its reproductive cells are produced with half the chromosome number, how many chromosomes would each reproductive cell contain?

Explanation:

Link:

Question (19)

Two reproductive cells, each containing 10 chromosomes, fuse. What chromosome number would be restored in the resulting zygote, assuming the normal condition is maintained?

Explanation:

Link:

Question (20)

Why would direct fusion of two body cells with the full chromosome number be problematic if the chromosome number doubled in every generation?

Explanation:

Link:

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