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Question (41)

QN008239

Which event directly marks the beginning of pregnancy?

(A) Menstruation
(B) Implantation
(C) Ovulation
(D) Gamete formation

Correct Answer: B

Explanation:

Pregnancy begins with implantation of embryo in uterus wall.

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Question (42)

QN008240

Which animal generally provides maximum parental care to offspring?

(A) Frog
(B) Fish
(C) Mammal
(D) Insect

Correct Answer: C

Explanation:

Mammals generally provide maximum parental care.

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Question (43)

QN008241

A fish population releases 2 million eggs. If 99.9% fail to survive, how many survive?

(A) 20
(B) 200
(C) 2000
(D) 20,000

Correct Answer: C

Explanation:

0.1% of 2,000,000 = 2000 survive.

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Question (44)

QN008242

Which adaptation increases survival of embryos in reptiles and birds?

(A) Aquatic fertilisation only
(B) Protective egg coverings
(C) Lack of shells
(D) External embryo development without eggs

Correct Answer: B

Explanation:

Protective egg coverings increase embryo survival.

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Question (45)

QN008243

Which reproductive variation is found in humans?

(A) External fertilisation and egg laying
(B) Internal fertilisation and viviparity
(C) Binary fission
(D) Spore formation

Correct Answer: B

Explanation:

Humans show internal fertilisation and viviparity.

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Question (46)

QN008244

Which factor mainly increases genetic variation in sexual reproduction?

(A) Presence of one parent
(B) Fusion of gametes from two parents
(C) Bud formation
(D) Regeneration

Correct Answer: B

Explanation:

Fusion of gametes from two parents increases variation.

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Question (47)

QN008245

If a species has 60 chromosomes in body cells, how many chromosomes will be present in the zygote after fertilisation?

(A) 30
(B) 60
(C) 90
(D) 120

Correct Answer: B

Explanation:

Zygote regains diploid chromosome number, i.e. 60.

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Question (48)

QN008246

Which statement correctly explains the survival advantage of internal fertilisation?

(A) Gametes are exposed to environment
(B) Embryos develop without nourishment
(C) Developing young ones receive better protection
(D) Fertilisation cannot occur

Correct Answer: C

Explanation:

Internal fertilisation protects developing young ones.

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Question (49)

QN008247

Which feature is most likely seen in animals with external fertilisation?

(A) Few eggs and high survival
(B) Many eggs and low survival
(C) Internal embryo development
(D) Long pregnancy period

Correct Answer: B

Explanation:

Animals with external fertilisation produce many eggs with low survival rate.

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Question (50)

QN008248

A student says all offspring in sexual reproduction are exactly identical. Which concept proves the statement wrong?

(A) Regeneration
(B) Gene recombination and variation
(C) Binary fission
(D) Budding

Correct Answer: B

Explanation:

Gene recombination causes variation among offspring.

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Question (41)

Which event directly marks the beginning of pregnancy?

Explanation:

Link:

Question (42)

Which animal generally provides maximum parental care to offspring?

Explanation:

Link:

Question (43)

A fish population releases 2 million eggs. If 99.9% fail to survive, how many survive?

Explanation:

Link:

Question (44)

Which adaptation increases survival of embryos in reptiles and birds?

Explanation:

Link:

Question (45)

Which reproductive variation is found in humans?

Explanation:

Link:

Question (46)

Which factor mainly increases genetic variation in sexual reproduction?

Explanation:

Link:

Question (47)

If a species has 60 chromosomes in body cells, how many chromosomes will be present in the zygote after fertilisation?

Explanation:

Link:

Question (48)

Which statement correctly explains the survival advantage of internal fertilisation?

Explanation:

Link:

Question (49)

Which feature is most likely seen in animals with external fertilisation?

Explanation:

Link:

Question (50)

A student says all offspring in sexual reproduction are exactly identical. Which concept proves the statement wrong?

Explanation:

Link:

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