CIE Biology Paper-3: Specimen Questions 110 - 112 of 230

Passage

Figure below shows the nitrogen cycle.

image of Nitrogen Cycle.

image of Nitrogen Cycle.

Label the processes occur in nitrogen cycle in biotic and abiotic environment

Question number: 110 (1 of 2 Based on Passage) Show Passage

Short Answer Question▾

Write in Short

Label one arrow in each case to show where each of the following processes occur in the nitrogen cycle.

(i) Nitrification – using the letter N

(ii) Ammonification – using the letter A

(iii) Denitrification – using the letter D

(iv) Nitrogen fixation – using the letter NF

Explanation

shows Image of Nitrogen Cycle.

shows Image of Nitrogen Cycle.

Label the processes occur in nitrogen cycle in biotic and abiotic environment

Question number: 111 (2 of 2 Based on Passage) Show Passage

Short Answer Question▾

Write in Short

Describe effects of nitrogen cycle in aquatic Ecosystem.

Explanation

Ammonia is toxic for fishes and invertebrates. If ammonia increase in blood/tissues then blood pH also enhance. It can causes imbalance in enzyme activity and decrease membrane stability. High level of ammonia reduce oxygen transport and gill damage.

Question number: 112

MCQ▾

Question

The diagram shows a germinating bean seed.

What are the structures X, Y and Z?

the diagram shows a germinating bean seed.

the diagram shows a germinating bean seed.

shows a germinating bean seed with it different parts

Choices

Choice (4) Response
a.

x- cotyledon, y-Radicle, z- seed coat

b.

x- Radicle, y- seed coat, z- cotyledon

c.

x- seed coat, y- Radicle, z- cotyledon

d.

x- Radicle, y- cotyledon, z- seed coat

Answer

b.

Explanation

seed coat provides protection from the environment, cotyledon help with embryo development and radicle is connected with the root.

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