IGCSE Biology Paper-3: Specimen Questions with Answers 52 - 55 of 358

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Question 52

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The binomial naming system used to identify all living things gives the humans a scientific name of Homo sapiens.

Which part of this name refers to the genus and which part refers to the species?

Explanation

(i) Genus- Homo is the human genus

(ii) Species - sapiens is the only surviving species of the genus Homo.

Question 53

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Explain how calcium affects human mouth. Also, write the name of food in which calcium can be found?

Explanation

Calcium is useful for tooth development, prevents loss of jawbone and teeth. It rebuild the hard surface of teeth. Calcium is found in milk, cheese. Yogurt and in dark green leafy vegetables.

Question 54

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New technologies are used to enhance the productivity of crops.

Name two chemical fertilizers, which are used, for yield of crops

Explanation

a. Anhydrous ammonia

b. urea

c. Superphosphate:

Passage

Figure shows a section of Flower.

Above Picture Shows Female and Male Parts of a Flower

Question 55 (1 of 3 Based on Passage)

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While watching a new area of forest a student found an unknown plant seed. Hanging from it were some structures with it was lighter and smaller than other seeds. They have special structures such as wings or fluff.

Suggest, how these seeds might be dispersed?

Explanation

Seeds might be dispersed by wind because they are usually lighter and small than other seeds, which make them easy for the wind to carry them.

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