IGCSE Biology Paper-3: Specimen Questions with Answers 153 - 159 of 230

Passage

In given diagram A plant’s leaves are covered by black paper and B plant is put in normal conditions.

found the effect on growth in A

Found the Effect on Growth in A

Covered and uncovered plant leaves in pot to know changes in leaves shape and color after one week

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What will happen after one week?

Explanation

The leaf which are covered A will start to lose its green color because of lack of sun light and photosynthesis process. In addition, plant B will grow normally and healthiest.

Question number: 154

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MCQ▾

Question

Genetic drift is done when some individual of species aggregate an island. This phenomenon is called.

Choices

Choice (4) Response

a.

Assortative effect

b.

Founder effect

c.

Bottleneck effect

d.

Random effect

Answer

b.

Explanation

Founder effect is a type of genetic drift in which genetic variations found when a new population is recognized through a very small number of individuals from a large population.

Passage

Study the food web below and answer the questions.

Example of Food Web of a grassland ecosystem

Example of Food Web of a Grassland Ecosystem

found the number of food chains found in given food web in grassland ecosystem

Question number: 155 (1 of 5 Based on Passage) Show Passage

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In which tropic level grasshopper stands.

Explanation

Primary consumer

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Why food web is necessary?

Explanation

For making the balance of ecosystem

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In what form is energy passed from the grass to the deer?

Explanation

chemical energy

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Is energy flow is a cycle like nitrogen cycle and carbon cycle?

Explanation

No, Energy do not back to the sun again.

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How many type of food chains occur in such food web?

Explanation

Two types of food chains are present in above figure.

1- Grass—grasshopper—frog—cobra—tiger

2- Grass—deer—tiger