IGCSE Biology Paper-4: Specimen Questions with Answers 240 - 243 of 279

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Passage

The diagram shows a section through a leaf.

Vascular Bundle

Question 240 (2 of 6 Based on Passage)

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State two functions of vascular bundles in leaves.

Explanation

Vascular system, in plants is the assemblage of conducting tissues and associated supportive fibers. Xylem tissue transports water and dissolved minerals to the leaves, and phloem tissue conducts food from the leaves to all parts of the plant.

Question 241 (3 of 6 Based on Passage)

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Short Answer▾

On the diagram, label a stoma, the cuticle, and a vascular bundle. Use label lines and the words “stoma” , “chloroplast” and “vascular bundle” on the diagram.

Explanation

Vascular Bundle
Mesophyll Cells

Question 242 (4 of 6 Based on Passage)

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The cuticle is made of a waxy material. Suggest an advantage to a plant of this feature.

Explanation

The upper surface of leaf is covered with a waxy, waterproof cuticle, which serves to reduce water loss from the leaf, so lowers down the transpiration rate.

Question 243 (5 of 6 Based on Passage)

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The upper layers of a leaf are transparent. Suggest an advantage to a plant of this feature.

Explanation

There is a single layer of upper epidermal cells containing few or no chloroplasts. The cells are quite transparent and permit most of the light that strikes them to pass through to the underlying cells.

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