IGCSE Biology Paper-2: Specimen Questions with Answers 28 - 30 of 103
Question number: 28
Question
What is the largest salivary gland?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Brunner’s gland |
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| b. | Liver |
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| c. | Parotids gland |
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| d. | Henley’s gland |
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Answer
c.Explanation
The parotid gland is a major salivary gland. In human beings, the two parotid glands occur under the mouth and in front of both ears.
Question number: 29
Question
Thymine in DNA is always paired with
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Adenine |
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| b. | Thymine |
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| c. | Guanine |
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| d. | Cytosine |
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Answer
a.Explanation
Reason behind it is chemical structure of each base. Adenine and Thymine establish two hydrogen bonds between them. Guanine and Cytosine establish three hydrogen bonds between them. so A and T are always paired and G and C are always paired.
Question number: 30
Question
Match list I and list II
| List-Ⅰ (Plants) | List-Ⅱ (Indication Of Climate) |
|---|---|
| (A) Xerophytes | (i) Heavy rain inwinter and low in summer |
| (B) Sclerophytes | (ii) Heavy rain in summer and winter |
| (C) Evergreen Forest | (iii) Low or no rain fall |
| (D) Grassland | (iv) Heavy rain in summer and low in winter |
Choices
| Choice (4) | Response | |
|---|---|---|
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| a. |
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| b. |
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| c. |
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| d. |
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Answer
a.Explanation
Evergreen forests present in the equatorial region where heavy rain occur in both summer and winter. Grassland develop in areas with 25 - 100 cm annual precipitation and sclerophytes are those areas where heavy rain occur in winter and low rainfall at summer. Xerophytes are also called as desert. Where low rainfall occur.