Sexual Reproduction in Flowering Plants Quiz - ICSE Class 12 Biology

Free practice quiz: Sexual Reproduction in Flowering Plants (ICSE Class 12 Biology). 27 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. In angiosperms, what is the primary function of the tapetum during microsporogenesis?

   1. To provide mechanical support to the developing microspores.
   2. To synthesize and secrete nutrients for the developing microspores and pollen grains.
   3. To facilitate the dehiscence of the anther locule.
   4. To absorb excess moisture from the anther.
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   Answer: B. To synthesize and secrete nutrients for the developing microspores and pollen grains.

   The tapetum is the innermost layer of the anther wall. Its cells are rich in cytoplasm and often multinucleate. They are responsible for providing nourishment to the developing microspores and pollen grains. The other options describe functions of different anther wall layers (e.g., endothecium for dehiscence) or are not the primary role of the tapetum.

2. What is the ploidy level of the antipodal cells in a mature embryo sac?

   1. Diploid
   2. Triploid
   3. Haploid
   4. Tetraploid
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   Answer: C. Haploid

   Antipodal cells are three haploid cells located at the chalazal end of the embryo sac. They are typically ephemeral and their function is not fully understood, though they may play a role in nourishing the embryo sac.

3. Which of the following is a biotic agent of pollination that often involves specific adaptations like nectar guides and scent production?

   1. Wind (Anemophily)
   2. Water (Hydrophily)
   3. Insects (Entomophily)
   4. Birds (Ornithophily)
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   Answer: C. Insects (Entomophily)

   Entomophily, or insect pollination, often involves flowers that are colorful, fragrant, and produce nectar. Many insect-pollinated flowers also have specific patterns called nectar guides, which direct insects to the nectar reward, indirectly facilitating pollen transfer. While birds also act as biotic pollinators, the specific mention of nectar guides and scent production is more characteristic of insect pollination.

4. The phenomenon where an embryo develops from the zygote and the endosperm develops from the primary endosperm nucleus is called:

   1. Asexual reproduction
   2. Apomixis
   3. Sexual reproduction
   4. Vegetative propagation
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   Answer: C. Sexual reproduction

   Sexual reproduction in flowering plants involves the fusion of male and female gametes (fertilization) to form a zygote, which develops into an embryo. The fusion of a male gamete with polar nuclei forms the endosperm, which nourishes the developing embryo. This entire process is the hallmark of sexual reproduction.

5. The process of formation of pollen grains from the pollen mother cells is called:

   1. Megasporogenesis
   2. Microsporogenesis
   3. Gametogenesis
   4. Oogenesis
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   Answer: B. Microsporogenesis

   Microsporogenesis is the process by which diploid microspore mother cells (pollen mother cells) undergo meiosis to produce haploid microspores. These microspores then develop into pollen grains.

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