IGCSE Biology Paper-3: Specimen Questions with Answers 322 - 325 of 358

Passage

Leaves are made of tissues.

Question 322 (3 of 6 Based on Passage)

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Outline how water that has entered a root hair cell reaches the stomata.

Explanation

Tranpirational Force

Question 323 (4 of 6 Based on Passage)

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Describe the functions performed by root hair cells?

Explanation

The main function of root hair is to find the gap between soil particles and facilitate the process of water absorption and nutrient minerals. Water and nutrients that have been absorbed are then taken to other parts of the plant roots. Acid is secreted by this root hair. Acid will help dissolve nutrient minerals in the form of ions so that nutrient minerals are more easily transported and transported within the roots.

Question 324 (5 of 6 Based on Passage)

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Stalk of leaf is called as

Explanation

Petiole (Mesopodium)

A petiole or leaf stalk is a cylindrical or sub cylindrical structure of a leaf which joins the lamina to the base. It raises the lamina above the level of stem to provide it with sufficient light exposure. A leaf with a petiole is called petiolate and the one without it is called sessile.

Structure of a Leaf

Question 325 (6 of 6 Based on Passage)

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Explain the importance of increasing humidity near the leaf surface.

Explanation

Relative Humidity

As the relative humidity of the air surrounding the plant rises the transpiration rate falls. It is easier for water to evaporate into dryer air than into more saturated air. Wind and air movement: Increased movement of the air around a plant will result in a higher transpiration rate.

Graph of Humidity

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