Formative Practice 8.3 (Form 5 Biology Textbook Exercise and Answer)

Question 1:
Why are viruses not classified into one of the six kingdoms?

When outside a living host cell, the virus exists as a crystal and is not considered a living thing because it does not carry out any life processes.

Question 2:
Why don’t parasites kill their hosts?

If the host dies, the parasite can no longer obtain anymore benefits from the host.

Question 3:
What is the meaning of symbiont? Explain the types of symbionts.

A symbiont is an organism which has a close relationship with another organism (known as the host).
There are two types of symbionts, ectosymbionts and endosymbionts. Ectosymbionts are organisms that live outside of host cells while endosymbionts are organisms that live inside host cells.

Question 4:
State the meaning of pathogens. Give three examples of pathogens and their vectors.

Pathogens are microorganisms that spread diseases. Example:

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