IGCSE Biology Paper-3: Specimen Questions with Answers 295 - 297 of 358

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Passage

Fig. is a diagram showing the events from pollination to fertilization in a species of flowering plant.

Structure of Plant

Question 295 (5 of 6 Based on Passage)

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Name the likely method of pollination for the flowers shown at P in Fig. Explain your choice.

Method of pollination. .

explanation …

Explanation

Geitonogamy

Geitonogamy is a kind of pollination in which the pollen from the anthers of one flower are transferred to the stigma of another flower borne on the same plant. It usually occurs in plants which show monoecious condition (unisexual, male, and female flowers are borne on the same plant) . Geitonogamy involves two flowers but these belong to the same parent plant.

Example: Maize

Pollen Transfer between Flowers

Question 296 (6 of 6 Based on Passage)

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In Fig. pollen is transferred from one plant to another.

State the name for this type of pollination.

Explanation

Cross Pollination

  • Cross pollination involves the transfer of pollen grains from the flower of one plant to the stigma of the flower of another plant. It is also called xenogamy.
  • Example: Apple, Pumpkin, Daffodils etc.
  • It is performed with the help of external agency that may be abiotic or biotic.
Pollen Transfer between Flowers

Passage

shows an incomplete diagram of the female urinary system.

Renal Artery, Ureter, and Urethra

Question 297 (1 of 6 Based on Passage)

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If the kidneys fail, the patient may be put on a kidney machine.

Explain how a kidney machine works.

Explanation

Hemodialysis

  • When the kidneys fail, it results in a lot of complications and to compensate this situation a technology called dialysis has been developed.
  • It uses a machine filter called a dialyzer or artificial kidney.
  • This is to remove excess water and salt, to balance other electrolytes in the body and remove waste products of metabolism.
  • Blood from the body is removed and flowed through a series of tubes made up of a semipermeable membrane.
  • A dialysate flows on the other side of the membrane, which draws impurities through the membrane.
A State of Relative Constancy

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