Practice Gametogenesis (1.3.2.1) - Chapter 1: Reproduction - ICSE 12 Biotechnology

Practice: Gametogenesis

Lesson 1.3.2.1Reproduction

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6 sample questions

Question 1.
What is the male gametophyte of a flowering plant?
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Think of what the microspore turns into.
Question 2.
Name the cells that make up the egg apparatus.
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It lies at the micropylar end of the embryo sac.
3Question 3.
How many nuclei and cells are present in a typical mature embryo sac?
- 7 nuclei and 8 cells
- 8 nuclei and 7 cells
- 8 nuclei and 8 cells
- 4 nuclei and 4 cells
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Two of the nuclei share one cell.
4Question 4.
Which cell of the pollen grain divides to form the two male gametes?
- Vegetative cell
- Generative cell
- Tapetal cell
- Pollen mother cell
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It is the smaller of the two cells in the pollen grain.
Question 5.
A student writes: "In a flowering plant, the egg is formed by meiosis of the megaspore mother cell." Explain what is incomplete in this statement and rewrite it correctly.
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Separate the making of spores from the development of the gametophyte.
Question 6.
The leaf cells of a flowering plant have 24 chromosomes. Give the chromosome number of (a) a pollen mother cell, (b) a generative cell, (c) a synergid, (d) an antipodal cell and (e) the primary endosperm nucleus, and explain your reasoning.
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Sporophyte cells are 2n, gametophyte cells are n, and the primary endosperm nucleus is 3n.

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