(a) (i) What is respiration?
(ii) In a tabular form, state four differences between gaseous exchange and aerobic respiration

(b)(i) Explain the term residual air.
(ii) What is the importance of residula air to mammals?

(c) State four characteristic features associated with respiratory structures.

(d)(i) What is oxygen debt?
(ii) Outline three activities that can result in oxygen debt. 
 

(a) What is photosynthesis?

(b) List: (i) four external factors
(ii) two internal factors; that affect the rate of photosynthesis.

(c)(i)List the major products of the light dependent stage of photosynthesis.
(ii)State the importance of each of the products listed in (c)(i) above.

(d)(i) Explain why there are no green plants at the lower depths of some lakes.
(ii) State why decomposers are important to flowering plants. 
 

(a)(i) What is ecological succession?
(ii) Describe the process of ecological succession on a bare plot of land.

(b) Explain the following terms:
(i) biosphere
(ii)population
(iii)community
(iv)ecosystem.

(c) Name one instrument each used for measuring:
(i) relative humidity
(ii) wind speed