MCQ Practice Questions 9

1. Which one of the following would be the result of cutting the vas deferentia (sperm ducts) on right and left sides in a male mammal ?
A. Male sex hormones would be no longer circulated in the blood.
B. The mammal would become sterile.
C. The mammal would be unable to pass urine.
D. The mammal would be unable to develop spermatozoa.

2. Genes affecting the same character or trait are located on the same position in homologous chromosomes. They are called
A. autosomes.
B. alleles.
C. loci.
D. chromatids.

3. Which of the following is an example of discontinuous variation ?
A. Range in height of pea plants from 30 to 50cm.
B. Offspring include two male cats and three female cats.
C. Pea plants grown in darkness are yellow.
D. Adult human skin colour ranges from fairness and darkness.

4. Three directions in which nerve impulses can travel in the nervous system are given
1. away from the central nervous system
2. towards the central nervous system
3. within the central nervous system
In which direction do impulses in sensory, relay (intermediate) and motor neurones travel?

Sensory neurone / relay neurone / motor neurone
A. 1 / 2 / 3
B. 1 / 3 / 2
C. 2 / 1 / 3
D. 2 / 3 / 1

5. Which of the following microorganisms help in the decomposition of sewage ?
A. Autotrophic organisms
B. Saprophytic organisms
C. Parasitic organisms
D. Both saprophytic and parasitic organisms

Answers
1.B
2.B
3.B
4. D
5. B