Class 12 Sexual Reproduction in Flowering Plants Mock Test (CBSE)

Topics in Sexual Reproduction in Flowering Plants

• Flower as a site of sexual reproduction
• Stamen, microsporangium and pollen grain
• Pistil, megasporangium and embryo sac
• Pollination
• Pollen-pistil interaction
• Artificial hybridisation
• Double fertilisation
• Endosperm and embryo development
• Seed and fruit
• Apomixis and polyembryony

Sexual Reproduction in Flowering Plants practice questions with answers

1. Q1Multiple choice·1 mark
   Apomixis, a form of asexual reproduction that mimics sexual reproduction, is commonly seen in species belonging to which of the following groups?

   1. (a)Asteraceae and grasses
   2. (b)Brassicaceae and Fabaceae
   3. (c)Cucurbitaceae and Malvaceae
   4. (d)Solanaceae and Liliaceae
   Show answer and step marks

   1. Correct option: (a) Asteraceae and grasses+1

   Answer: (a)
2. Q2Multiple choice·1 mark
   Which of the following is an example of a non-albuminous seed?

   1. (a)Maize
   2. (b)Pea
   3. (c)Castor
   4. (d)Wheat
   Show answer and step marks

   1. Correct option: (b) Pea+1

   Answer: (b)
3. Q3Short answer·2 marks
   Differentiate between the essential and non-essential whorls of a flower. Give one appropriate example for each.
   Show answer and step marks

   1. Essential whorls are directly involved in sexual reproduction: they bear the organs that produce male and female gametes.+0.5
   2. Non-essential (accessory) whorls are not directly involved in reproduction: they protect the floral bud or attract pollinators.+0.5
   3. Example of an essential whorl: either androecium (stamens) or gynoecium (carpels/pistil).+0.5
   4. Example of a non-essential whorl: either calyx (sepals) or corolla (petals).+0.5

   Answer: Essential whorls take part directly in sexual reproduction by producing gametes, e.g. androecium or gynoecium; non-essential (accessory) whorls only protect the bud and attract pollinators, e.g. calyx or corolla.
4. Q4Short answer·2 marks
   Name the two essential whorls of a flower. Why are they referred to as essential whorls in relation to sexual reproduction?
   Show answer and step marks

   1. First essential whorl: Androecium.+0.5
   2. Second essential whorl: Gynoecium.+0.5
   3. Reason: They are directly involved in sexual reproduction because they bear the reproductive organs that produce male and female gametes.+1

   Answer: Androecium and Gynoecium; they produce male and female gametes.
5. Q5Short answer·3 marks
   Explain the structural organization of a typical microsporangium in angiosperms as seen in a transverse section. Name the four wall layers from outside to inside and state the function of the innermost layer.
   Show answer and step marks

   1. In transverse section a microsporangium is nearly circular in outline, with four wall layers surrounding the central sporogenous tissue.+0.5
   2. First (outermost) layer: epidermis.+0.5
   3. Second layer: endothecium.+0.5
   4. Third: middle layers.+0.5
   5. Fourth (innermost) layer: tapetum.+0.5
   6. Function of the tapetum: it nourishes the developing pollen grains.+0.5

   Answer: A microsporangium is nearly circular in transverse section, with four wall layers around the central sporogenous tissue: epidermis, endothecium, middle layers and tapetum (outside to inside). The tapetum nourishes the developing pollen grains.

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