All Questions
Draw a well labeled diagram of the guard cells. (3 mks)
(a) Name three factors affecting the rate of breathing in human beings. (3 mks)
(b) Define the following terms as used in gaseous exchange. (2 mks)
(i) Tidal volume –
(ii) Residual volume -
Study the diagram below and answer the questions that follow.
(a) Name the blood vessels labeled A to E. (2 mks)
A ______________________________
E_______________________________
(b) State two differences between blood vessel B and D. (2 mks)
(c) State two adaptations of the blood vessel labeled C to its functions. (2 mks)
State three adaptations that enables prey to evade predators. (3 mks)
What is the importance of the stroma in the Chloroplast? (2 mks)
Name the cell structures that synthesize the following cell organelles:-
(a) Lysosomes - (1 mk)
(b) Ribosomes - (1 mk)
How does carboxyhaemoglobin lead to death? (2 mks)
The diagram below represents an organ of gaseous exchange.
(a) What is the name of the organ? (1 mk)
(b) State two ways in which structure X is adapted to gaseous exchange. (2 mks)
The figure below shows a structure used in gaseous cells
(a) What do guard cells lie in close contact with epidermal cells (1 mk)
(b) Identify the structure,. (1 mk)
(c) Explain one observable texture on the figure that adapts the structure to its function. (2 mks)
Below is a dental formula of a mammal
I0/4 C0/0 PM3/3 M2/3
(a) What is the total number of teeth (1 mk)
(b) (i) What is the mode of feeding in the mammal? (1 mk)
(iii) Give one reason for your answer above. (1 mk)