FORM THREE BIOLOGY HOLIDAY ASSIGNMENT.
1.Industrial wastes may contain metallic pollutants. State how such pollutants may indirectly reach and
accumulate in the human body if the wastes were dumped into rivers.
……………………………………………………………………………………………...
……………………………………………………………………………………………...
……………………………………………………………………………………………...
2. The figure below is a diagram of the nitrogen cycle.
(a)
(b)
Identify the bacteria;
A
………………………………………………………
(1 mark)
B
………………………………………………………
(1 mark)
State the processes;
C
………………………………………………………
(1 mark)
D
………………………………………………………
(1 mark)
1
(c)
(d)
Name the process;
E
…………………………………………………….
(1mark)
F
…………………………………………………….
(1 mark)
G
…………………………………………………….
(1 mark)
Nitrogen in the atmosphere cannot be directly utilized by plants. State two ways by which
this nitrogen is made available for plant use.
(2 marks)
…………………………………………………………………………………………….
…………………………………………………………………………………………….
3. Explain why the biomass of primary producers is greater than that of primary consumers in a
balanced ecosystem.
(2 marks)
…………………………………………………………………………………………….
…………………………………………………………………………………………….
4. State one similarity and one difference between parasitic and predatory modes of feeding.
(2 marks)
Similarity
………………………………………………………………………
…………………………………………………………………………………………….
Difference
………………………………………………………………………
…………………………………………………………………………………………….
5.
With reference to leaf structure only, explain five ways by which plants are adapted to living in
arid conditions.
(5 marks)
…………………………………………………………………………………………….
…………………………………………………………………………………………….
…………………………………………………………………………………………….
…………………………………………………………………………………………….
…………………………………………………………………………………………….
2
6.). The diagram below represents recycling of nutrients in an ecosystem.
(a) Name the trophic level represented by M.
(1 mark)
…………………………………………………………………………………………….
(b) Name the process represented by
I
(3 marks)
………………………………………………………………
II ………………………………………………………………
III ………………………………………………………………
(c) Name the organisms involved in process II
(2 marks)
…………………………………………………………………………………………….
6.
Name the organism that causes amoebic dysentery.
(1 mark)
…………………………………………………………………………………………….
3
7.
After an ecological study of feeding relationships, students constructed the food web below.
(a)
Name the process through which energy from the sun is incorporated into the food web.
(1 mark)
…………………………………………………………………………………………….
(b)
State the mode of feeding of the birds in the food web.
(1 mark)
…………………………………………………………………………………………….
(c)
Name two ecosystems in which the organisms in the food web live.
(2 marks)
…………………………………………………………………………………………….
…………………………………………………………………………………………….
(d)
From the information in the food web, construct a food chain with the large bird as a
quaternary consumer.
(1 mark)
…………………………………………………………………………………………….
(e)
What would happen to the organisms in the food web in bird N migrated?
(3 marks)
…………………………………………………………………………………………….
…………………………………………………………………………………………….
4