IGCSE Biology Paper-4: Specimen Questions with Answers 118 - 119 of 120

Question number: 118

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Figure shows two different type of plants - Plant A and plant B. What is the similarity and dissimilarity in both plants?

Image shows two kind of plants

Image Shows Two Kind of Plants

Explanation

In both plants stem transport water and other nutrients from the root to the leaves and it also transfer food from the leaves to all the parts of plant. The main difference in given plant A and B is related to weak stem and strong stem. Plant A have weak and plant B has strong stem.

Passage

Carbon dioxide is important greenhouse gases. The effect of human activities in increasing the concentration of greenhouse gases, such as carbon dioxide and methane, is known as the enhanced greenhouse effect.

Question number: 119 (1 of 2 Based on Passage) Show Passage

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What is the role of methane as a source of greenhouse gas?

Explanation

Methane is the second most important greenhouse gas after carbon di oxide. Its effect is 20 times more than carbon di oxide, but there is low amount of methane is present in atmosphere. It contribute about 25 % of total global warming. Cows and termites generate methane gas. Rice growing produces methane. Anaerobic bacteria living in swamps and garbage dumps also produce methane. Coal mining and oil wells produce methane. The amount of methane in the atmosphere has increased only slowly since 2000 although methane continues to enter the atmosphere at the same rate.

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