Formative Practice 12.1 (Form 5 Biology Textbook Exercise and Answer)

Question 1:
How can variation increase the survival of species?

An organism in a population that has variation possesses characteristic which is adaptable to the environment compared to other organisms within the same population which do not have the variation.

Question 2:
Determine the following variations:
(a) Intelligence
(b) Presence of dimples
(c) Type of hair
(d) Height
(e) Type of earlobes


Question 3:
State two causes of variation.

Genetic factor and environmental factor

Question 4:
Variation occurs because of sexual reproduction

Explain the above statement.

Sexual reproduction involves fertilisation between male gamete and female gamete.
During formation of gamete, cross-linking occurs between homologous chromosomes.
Fertilisation between two types of gametes occurs randomly which causes variation in the offspring produced.

Leave a Comment