In the diagram, the arrow labelled II represents the

In the diagram, the function of the part labelled 2 is to?

(a) Explain briefly four factors that affect the diffusion of substances.

(b) Explain the following terms:
(i) active transport
(ii) transpiration.

(c) State four ways by which plants can reduce high rate of transpiration.

(d) State the features of red blood cells and how these features adapt the cell to perform its functions. 

(a) Describe briefly the role of the stomach in digestion.

(b) (i) Name three parts of plants in which food can be stored.
(ii) Give one example in each case.

(c) Explain briefly how the level of sugar in the mammalian blood can be regulated.

(a) Explain briefly the following terms:
(i) conservation
(ii) endangered species.

(b) State: (i) five reasons why conservation of forests is important;
(ii) four ways by which forest reserves can be conserved.

(c)(i) What is the importance of decomposers in the ecosystem?
(ii) Name one plant and one animal decomposer.