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 441· Heredity and variation· JAMB
In peas, round seed (R) is dominant to wrinkled seed (r). What fraction of the offspring of Rr × rr will be wrinkled?
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Answer: B. ½
Explanation and discussion
Question 442· Heredity and variation· JAMB
An organism with two identical alleles for a trait is
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Answer: B. homozygous
Explanation and discussion
Question 443· Heredity and variation· WAEC
Haemophilia is more common in males because it is
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Answer: D. sex-linked on the X chromosome
Explanation and discussion
Question 444· Nutrition· JAMB
A deficiency of vitamin D in children causes
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Answer: D. rickets
Explanation and discussion
Question 445· Nutrition· WAEC
In testing a leaf for starch, the leaf is boiled in alcohol to
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Answer: C. remove chlorophyll
Explanation and discussion
Question 446· Nutrition· WAEC
An organism that makes its own food from simple substances is
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Answer: C. autotrophic
Explanation and discussion
Question 447· Nutrition· WAEC
The food substance that provides most energy for the body is
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Answer: A. carbohydrate
Explanation and discussion
Question 448· Nutrition· WAEC
Which of these is an insectivorous plant?
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Answer: B. pitcher plant
Explanation and discussion
Question 449· Nutrition· JAMB
Roughage in the diet helps to
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Answer: A. prevent constipation by aiding peristalsis
Explanation and discussion
Question 450· Nutrition· JAMB
Hydrochloric acid in the stomach helps digestion by
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Answer: D. providing the acid conditions in which pepsin works and killing bacteria
Explanation and discussion
Question 451· Nutrition· WAEC
Starch in a food sample is detected with
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Answer: C. iodine solution
Explanation and discussion
Question 452· Nutrition· WAEC
Which of the following is a saprophyte?
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Answer: C. Mushroom
Explanation and discussion
Question 453· Nutrition· JAMB
A food sample gives a blue-black colour with iodine solution and no colour change with Benedict's solution. The food contains
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Answer: B. starch but no reducing sugar
Explanation and discussion
Question 454· Nutrition· JAMB
A plant kept in a box without carbon(IV) oxide for two days will lack
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Answer: D. starch in its leaves
Explanation and discussion
Question 455· Nutrition· JAMB
The end products of the digestion of proteins are:
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Answer: C. amino acids
Explanation and discussion
Question 456· Nutrition· WAEC
Teeth used for cutting food are the
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Answer: D. incisors
Explanation and discussion
Question 457· Nutrition· WAEC
Rickets is caused by a deficiency of
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Answer: C. vitamin D
Explanation and discussion
Question 458· Nutrition· WAEC
Most absorption of digested food takes place in the
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Answer: D. ileum
Explanation and discussion
Question 459· Nutrition· WAEC
Lack of vitamin C in the diet causes
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Answer: C. scurvy
Explanation and discussion
Question 460· Nutrition· JAMB
Benedict's solution is used to test for
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Answer: D. reducing sugars
Explanation and discussion

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JAMB and WAEC Biology questions

In peas, round seed (R) is dominant to wrinkled seed (r). What fraction of the offspring of Rr × rr will be wrinkled?

An organism with two identical alleles for a trait is

Haemophilia is more common in males because it is

A deficiency of vitamin D in children causes

In testing a leaf for starch, the leaf is boiled in alcohol to

An organism that makes its own food from simple substances is

The food substance that provides most energy for the body is

Which of these is an insectivorous plant?

Roughage in the diet helps to

Hydrochloric acid in the stomach helps digestion by

Starch in a food sample is detected with

Which of the following is a saprophyte?

A food sample gives a blue-black colour with iodine solution and no colour change with Benedict's solution. The food contains

A plant kept in a box without carbon(IV) oxide for two days will lack

The end products of the digestion of proteins are:

Teeth used for cutting food are the

Rickets is caused by a deficiency of

Most absorption of digested food takes place in the

Lack of vitamin C in the diet causes

Benedict's solution is used to test for