IGCSE Biology Paper-3: Specimen Questions with Answers 266 - 267 of 358

Passage

Many flowering plants can reproduce sexually and asexually.

Question 266 (6 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 267 (7 of 7 Based on Passage)

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State one advantage and one disadvantage of asexual reproduction for flowering plants.

advantage. .

disadvantage. . .

Explanation

The Advantages of Asexual Reproduction Include

  • the population can increase rapidly when the conditions are favorable.
  • only one parent is needed.

  • it is more time and energy efficient as organism don’t need a mate.

  • it is faster than sexual reproduction.

The Disadvantages of Asexual Reproduction Include

  • it does not lead to genetic variation in a population.

  • the species may only be suited to one habitat.

  • disease may affect all the individuals in a population.