Which of the following conditions is not necessary for photosynthesis to occur in plants?

A. There must be light

B. There must be xylem tissue used to conduct water

C. There must be chlorophyll to trap radiant energy

D. Carbondioxide must be present

E. Water must be present

The distribution of organisms in a fresh - water habitat like a stream or pond is determined by the following
except

A. rainfall

B. temperature

C. pH of soil

D. light penetration

E. tidal movements

Which of the following is characteristics of a swamp?

A. Vegetation with stratified arrangement

B. mesophytes with broad leaves

C. The ground is flooded most of the time

D. Predominance of climbing plants

E. Many plants with tire resistant structures

Very low annual rainfall, sparse vegetation, high day temperatures and cold nights are the characteristics
of the biome known as

A. swamp

B. tropical forest

C. southern guinea savanna

D. afro alpine

E. desert

Which of the following conclusions
cannot be drawn from the graphs?

A. Ion is taken up more rapidly at suitable temperature

B. Suitable oxygen concentration increases ion uptake

C. Ion uptake requires energy from aerobic respiration of sugar

D. Ion uptake occurs most rapidly in adequate supply of, respiratory substrate

E. The quantity of ions absorbed is inversely proportional to the quantity of carbohydrate (sugar) synthesized.

Which of the temperature ranges will likely favour the plant best?

A. 0 -10^oC

B. 15.-20^oC

C. 30- 40^oC

D. 45 - 50^oC

E. above 50^oC

Which of the following is the correct chain for the organism found in an aquatic community?

A. Paramecium, Phytoplankton, Prawn, Waterflea, Tilapia, Shark

B. Waterflea, Paramecium, Phytoplankton, Prawn, Tilapia, Shark

C. Phytoplankton, Waterflea, Paramecium, Prawn, Shark, `tilapia

D. Phytoplankton, Paramecium, Waterflea, Prawn, Tilapia, Shark

E. Paramecium, Phytoplankton, Waterfiea, Prawn, Shark, Tilapia

In a food chain the position occupied by an organism is called

A. the trophic level

B. energy level

C. the feeding level

D. the habitat level

E. niche

Which of these statements about food chain is not correct?

A. Animals in the chain are consumers

B. A food chain usually begins with a green plant

C. All organisms in a food chain are animals

D. Living things are dependent on one another

E. The food chain involves energy transfer in an ecosystem

Which of these is not applicable to the circulation of water- in nature?

A. Water removed from oceans are Permanently lost

B. Water constantly evaporates from the seas, rivers, lakes and soil

C. Water vapour rises

D. Water is absorbed by plants and animals from their external environment

E. Plants lose water by transpiration and decay