Question 1
Explain why a person discharges urine more frequency when environmental temperatures are lower than when they are high.
Answer
When environmental temperatures are low, water loss through sweating is reduced leading to increase in urine output; in high temperature water is lost through sweating hence low urine output.
Question 2
Name the nitrogenous waste product excreted by a fresh water fish.
Answer
Ammonia
Question 3
Explain how the xylem vessels are adapted to their functions.
Answer
- - Lignified to prevent collapsing of its walls.
- - Pits to allow lateral movement of water
- - Narrow to enhance capillarity
- - Lack cross walls for faster movement of water
Question 4
State three evidences of organic evolution.
Answer
- - Fossil records
- - Comparative anatomy
- - Comparative embryology geographical distribution
- - Cell biology
Question 5
In an experiment, it was found that when maggots are exposed to light, they move to the dark areas
a) Name the type of response exhibited by the maggots.
b) State the survival value of the response in (a) above.
Answer
a) Negative photo taxis
b) To avoid predation
b) To avoid predation