IGCSE Biology Paper-3: Specimen Questions with Answers 296 - 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 296 (6 of 6 Based on Passage)

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Name structure Q shown in Fig. and state its function.

Explanation

Q: Pollen Tube

Pistil and pollen chemical secretions determine the compatibility of pollen grains. If incompatible is there, then either germination of pollen grain is inhibited or pollen tube abort in style, but if compatible pollen tube reaches the style it causes fertilization.

L. S. Of Pistill Showing Path

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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Name three components that are present in the urine of a healthy person.

Explanation

Chemical Composition

Urine consists of water and organic and inorganic substances. Water alone forms about 95 % of it, other substances form only 5 % . The organic substances are mainly nitrogenous organic compounds include urea, uric acid, creatinine and hippuric acid. Of these, urea is the principal component of human urine. The non-nitrogenous organic compounds include vitamin C, oxalic acid, phenolic substances include ammonia, and mineral salts such as chlorides, sulphates and phosphates of sodium, potassium, calcium, and magnesium. Sodium chloride is the principal mineral salt of the urine. Urine also contains some other substances, such as pigments and drugs, and some epithelial cells and leucocytes.

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