IGCSE Biology Paper-4: Specimen Questions with Answers 48 - 49 of 279

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Question 48

Describe in Detail

Essay▾

Figure shows a plant. They have long roots. What is the reason behind it?

Figure Shows a Plant – Why They Have Long Roots

Explanation

Desert plants look very dissimilar from plants native to other areas. They are often swollen, spiny, and have tiny leaves that are rarely bright green. Their strange look is a result of their adaptations in the desert climate. Natural vegetation is very poor in the desert portion. Most of the desert vegetation has long roots to collect water from the deep surface. Cactus have very long roots, which can search water from deep underground. It also stores the water in its stem and leaves. Therefore, it can survive in the hot desert.

Question 49

Describe in Detail

Essay▾

Use the key to identify each species. Write the letter of each species (A to c) in the correct box beside the key.

Image Shows Different Kind of Insects
  1. One pair of wings present … Go to 2

If two pairs of wings are present … Go to 3.

  1. Tip of abdomen without 2 - 3 thread-like tails. (Diptera) (True/False)

Tip of abdomen with 2 - 3 thread-like tails. (Diptera) (True/False)

  1. Sucking mouth parts in the form of a rigid beak (Homoptera) (True/False)

Mouth parts not in the form of a rigid beak (Homoptera) (True/False)

  1. Antennae always short and bristly (Odonata) (True/False)

Antennae never short and bristly (Odonata) (True/False)

Explanation

One pair of wings present…………Go to 2

If two pairs of wings are present … Go to 3.

2. Tip of abdomen without 2 - 3 thread-like tails. (Diptera) (True) (Figure A)

Tip of abdomen with 2 - 3 thread-like tails. (Diptera) (False)

3. Sucking mouth parts in the form of a rigid beak (Homoptera) (True) (Figure B)

Mouth parts not in the form of a rigid beak (Homoptera) (False)

4. Antennae always short and bristly (Odonata) (True) (Figure C)

Antennae never short and bristly (Odonata) (False)

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