IGCSE Biology Paper-1: Specimen Questions with Answers 77 - 78 of 208

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Question 77

Question

MCQ▾

The graph shows how the concentration of oxygen and numbers of fishes and bacteria in a river when sewage flows into it. Dotted curve represents ________

He Graph Shows How the Concentration of Oxygen

Choices

Choice (4)

a.

concentration of bacteria

b.

Concentration of fishes

c.

Concentration of total dissolved solids

d.

Concentration of oxygen

Answer

b.

Explanation

Dissolved oxygen is important in many forms of life like fish, invertebrates, bacteria and plants. These organisms use oxygen in respiration.

Question 78

Question

MCQ▾

the figure shows different living organisms living in aquatic ecosystem. Which process do all living organisms carry out?

Image Shows Different Living Organisms in an Aquatic Ecosystem

Choices

Choice (4)

a.

Flowering

b.

Photosynthesis

c.

Pollination

d.

Respiration

Answer

d.

Explanation

Respiration is the characteristics of all living organisms. In given diagram photosynthesis process Flowering and pollination, are only carried out by plants. Respiration occur in all living organisms given in this diagram. Respiration is a process in which movement of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction.

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