JAMB and WAEC Biology questions

791 questions with answers and explanations. Tap an option to check yourself.

All topics Cell structure and organisation · 56 Cellular activities · 56 Co-ordination and control · 58 Ecology · 71 Evolution · 45 Excretion · 52 Growth · 45 Heredity and variation · 60 Nutrition · 64 Reproduction · 62 Respiration · 55 Support and movement · 50 Transport · 57 Variety of organisms · 60

Question 381· Growth· WAEC
Which of these conditions is NOT necessary for the germination of most seeds?
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Answer: C. light
Explanation and discussion
Question 382· Growth· JAMB
Complete metamorphosis in insects follows the sequence
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Answer: D. egg, larva, pupa, adult
Explanation and discussion
Question 383· Growth· JAMB
Gibberellins are plant hormones that promote
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Answer: D. stem elongation and seed germination
Explanation and discussion
Question 384· Heredity and variation· JAMB
Colour blindness is commoner in males because the gene is
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Answer: C. recessive and carried on the X chromosome
Explanation and discussion
Question 385· Heredity and variation· JAMB
What genotypes are possible among the children of an AS father and an AA mother?
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Answer: D. AA and AS
Explanation and discussion
Question 386· Heredity and variation· WAEC
In a monohybrid cross, the ratio of tall to short plants in the F₂ generation is
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Answer: C. 3 : 1
Explanation and discussion
Question 387· Heredity and variation· JAMB
The number of chromosomes in a normal human body cell is:
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Answer: A. 46
Explanation and discussion
Question 388· Heredity and variation· JAMB
Two parents both have blood group A with genotype AO. What is the probability that their child has blood group O?
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Answer: A. ¼
Explanation and discussion
Question 389· Heredity and variation· WAEC
The genotype of a person who is a carrier of sickle cell is
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Answer: D. AS
Explanation and discussion
Question 390· Heredity and variation· JAMB
A couple already has three daughters. What is the probability that their fourth child will be a boy?
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Answer: C. ½
Explanation and discussion
Question 391· Heredity and variation· JAMB
The observable characteristics of an organism make up its
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Answer: A. phenotype
Explanation and discussion
Question 392· Heredity and variation· JAMB
A sudden, heritable change in a gene or chromosome is called
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Answer: D. a mutation
Explanation and discussion
Question 393· Heredity and variation· JAMB
Sickle-cell anaemia is caused by:
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Answer: A. a gene mutation affecting haemoglobin
Explanation and discussion
Question 394· Heredity and variation· JAMB
A gene that shows its effect only when two copies are present is described as
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Answer: A. recessive
Explanation and discussion
Question 395· Heredity and variation· JAMB
Mendel's first law is the law of
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Answer: C. segregation
Explanation and discussion
Question 396· Heredity and variation· JAMB
Gregor Mendel carried out his experiments on heredity using the
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Answer: B. garden pea
Explanation and discussion
Question 397· Heredity and variation· JAMB
Mendel's first law states that
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Answer: B. the two alleles of a gene separate during gamete formation
Explanation and discussion
Question 398· Heredity and variation· JAMB
A father has blood group A (genotype AO) and the mother has blood group B (genotype BO). Their children could have blood group(s)
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Answer: B. A, B, AB or O
Explanation and discussion
Question 399· Heredity and variation· WAEC
A person with blood group O can donate blood to people of
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Answer: B. all the ABO groups
Explanation and discussion
Question 400· Heredity and variation· WAEC
Which of these shows continuous variation?
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Answer: B. height
Explanation and discussion

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JAMB and WAEC Biology questions

Which of these conditions is NOT necessary for the germination of most seeds?

Complete metamorphosis in insects follows the sequence

Gibberellins are plant hormones that promote

Colour blindness is commoner in males because the gene is

What genotypes are possible among the children of an AS father and an AA mother?

In a monohybrid cross, the ratio of tall to short plants in the F₂ generation is

The number of chromosomes in a normal human body cell is:

Two parents both have blood group A with genotype AO. What is the probability that their child has blood group O?

The genotype of a person who is a carrier of sickle cell is

A couple already has three daughters. What is the probability that their fourth child will be a boy?

The observable characteristics of an organism make up its

A sudden, heritable change in a gene or chromosome is called

Sickle-cell anaemia is caused by:

A gene that shows its effect only when two copies are present is described as

Mendel's first law is the law of

Gregor Mendel carried out his experiments on heredity using the

Mendel's first law states that

A father has blood group A (genotype AO) and the mother has blood group B (genotype BO). Their children could have blood group(s)

A person with blood group O can donate blood to people of

Which of these shows continuous variation?