IGCSE Biology Paper-3: Specimen Questions with Answers 262 - 263 of 358

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Passage

Many flowering plants can reproduce sexually and asexually.

Question 262 (2 of 7 Based on Passage)

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Pollination is the transfer of pollen from the anther to the stigma. Pollen can be transferred to the stigma by being carried by the wind or by animals.

(i) State two structural adaptations of a flower for wind-pollination.

Explanation

Wind pollinated flowers have few ovules or even one ovule in the ovary, because the chances of pollination are rare. Anemophilous flowers are small and inconspicuous with long and versatile stamens. e. g. , Sugarcane, Maize, Wheat, Bamboo, Pinus, Papaya, Grasses, Typha, Datepalm, Coconut, Mulberry, Chenopodium etc. This type of pollination mainly observed in Graminae. A tassel of maize gives rise to 20 - 25 million pollen grains.

Question 263 (3 of 7 Based on Passage)

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Fig. shows a potato plant, Solanum tuberosum, grown from a tuber. The tubers that potato plants are grown from are commonly referred to as seed potatoes.

Potatoes can reproduce asexually by means of tubers. The parent plant produces underground stems, which eventually form tubers.

With reference to Fig. describe how tubers are formed from the underground stems in potatoes.

Diagram of Plant

Explanation

Tuber

  • Irregularly shaped swollen stem.
  • Stores plenty of food.
  • It is differentiated into nodes and internodes. The ‘eyes’ on potato tuber indicate axillary buds at the nodes.
  • It bears scaly leaves. The leaves do not store food.
  • Axillary buds arise at the nodes.
  • Does not bear roots.
  • E. g. , Solanum tuberosum (potato) .
Tuber of Potato

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