IGCSE Biology Paper-3: Specimen Questions with Answers 260 - 262 of 358

Question 260

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Short Answer▾

Choose words from the list to complete the spaces in the sentences.

Each word may be used once, more than once or not at all.

In humans, the female gamete is the egg and the male gamete is the …

Both gametes are … cells.

An egg is produced by an … and passes along an … to reach the uterus.

When humans reproduce, their gametes fuse to form a cell called the …

Explanation

In humans, the female gamete is the egg and the male gamete is the sperm.

  • Both gametes are haploid cells.
  • An egg is produced by an ovary and passes along an oviduct to reach the uterus.
  • When humans reproduce, their gametes fuse to form a cell called the Zygote.

Passage

Many flowering plants can reproduce sexually and asexually.

Question 261 (1 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.

(ii) State how self-pollination differs from cross-pollination.

Explanation

Types of Pollination

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.