Gametes and fertilisation Quiz
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5 questions, one answer each
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1. Which structure in a sperm contains hydrolytic enzymes?
- A. The midpiece
- B. The acrosome
- C. The flagellum
- D. The nucleus
2. What is the effect of the cortical reaction?
- A. Hydrolytic enzymes digest the zona pellucida
- B. The ovum becomes diploid
- C. The sperm tail is released
- D. The zona pellucida hardens, so no more sperm can enter
3. A plant has 2n = 20. How many chromosomes are in its endosperm nucleus?
- A. 30
- B. 10
- C. 20
- D. 40
4. Through which structure does the pollen tube enter the ovule?
- A. The style
- B. The stigma
- C. The micropyle
- D. The polar nucleus
5. In a pollen tube investigation, germination was low at both 0 g and 25 g of sucrose per 100 cm³. What best explains the low germination at 25 g?
- A. Sucrose is toxic only at high temperatures
- B. Water leaves the pollen grains by osmosis because the solution has a lower water potential
- C. The pollen grains take in too much water and burst
- D. Sucrose cannot be used in respiration