IGCSE Biology Paper-4: Specimen Questions with Answers 118 - 120 of 279

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Question 118

Describe in Detail

Essay▾

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

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 119 (1 of 2 Based on Passage)

Describe in Detail

Essay▾

Figure shows the concentrations of carbon dioxide in the atmosphere over past years. Describe the trend in the concentrations of carbon dioxide over the past years.

Image Shows Global Carbon Dioxide Emission in 1751 - 2006

Explanation

Above graph shows how atmospheric carbon di oxide levels have dramatically increased in recent years.

Question 120 (2 of 2 Based on Passage)

Edit

Describe in Detail

Essay▾

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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