IGCSE Biology Paper-3: Specimen Questions with Answers 245 - 246 of 358

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Question 245

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Explain why it is important for humans to carry out conservation of fossil fuels and water supplies.

Explanation

We should conserve the fuel, because the fuels are getting depleted, and the chance for the fuel in the future will be less. Then, the future generations will suffer, with the lack of fuel. If we didn՚t conserve the fuels, then, there won՚t be any re-accomplishment. So, it is important to conserve it, as it takes millions of years for its formation. So, the Sustainable development is essential, and the conservation of the fuel is essential.

We should conserve water because only 1 % of the earth՚s surface is drinking covered with pure water which is fresh and suitable for drinking for all forms of life.

Passage

A typical leaf contains different types of cells.

Represents a typical leaf.

Surface of Most Leaves

Question 246 (1 of 2 Based on Passage)

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State the name of the layer of cells that is beneath the layer of wax that covers the outer surface.

Explanation

Epidermis

Each leaf bears upper and lower epidermis. Each of them consists of single layer of compactly arranged parenchymatous cells. Exception – multilayered upper epidermis is found in Ficus elastica, Piper. Cuticle is present on both surfaces but cuticle of upper epidermis is thicker. Dorsiventral leaves are mostly hypostomatic in which stomata present on lower surface. In amphistomatic dorsiventral leaves stomata are more on lower epidermis as compared to upper epidermis. Ex: Potato.

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