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Quiz Chapter 6: Sexual Reproduction in Flowering Plants

10 questions · Form 5 Biology Bab 6: Sexual Reproduction in Flowering Plants

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. What is the function of the endosperm tissue in seeds?

  1. Protecting the seed against mechanical impact
  2. Nourishing the developing embryo during development and early germination
  3. Attracting animal vectors for seed dispersal
  4. Absorbing sunlight for photosynthesis in dormant seeds
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Answer: B

The triploid endosperm stores essential nutrients (carbohydrates, proteins, fats) to feed the developing plant embryo.

2. Which sequence correctly traces the path of male gametes from pollen germination to fertilization?

  1. Stigma $arrow$ Style $arrow$ Micropyle $arrow$ Embryo Sac
  2. Ovary $arrow$ Style $arrow$ Stigma $arrow$ Micropyle
  3. Micropyle $arrow$ Stigma $arrow$ Embryo Sac $arrow$ Style
  4. Style $arrow$ Anther $arrow$ Filament $arrow$ Ovary
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Answer: A

Pollen germinates on the stigma, grows down the style, enters the ovule via the micropyle, and enters the embryo sac.

3. What ploidy level is the endosperm nucleus formed during double fertilization in flowering plants?

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

The triploid (3n) endosperm nucleus is formed when one haploid male gamete (n) fuses with two polar nuclei (2n) in the central cell.

4. During double fertilization, what occurs when the first male gamete fuses with the egg cell?

  1. Formation of a triploid endosperm nucleus
  2. Formation of a diploid zygote
  3. Degeneration of synergid cells
  4. Development of the pericarp
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Answer: B

Syngamy occurs when the first haploid male gamete (n) fuses with the haploid egg cell (n) to produce a diploid zygote (2n).

5. How are the two male gametes formed in the pollen tube?

  1. By meiosis of the tube nucleus
  2. By mitotic division of the generative nucleus
  3. By meiosis of the microspore mother cell
  4. By binary fission of the exine layer
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Answer: B

The generative nucleus inside the germinating pollen grain divides by mitosis to form two haploid (n) male gametes.

6. Which cell division sequence produces a mature microspore tetrad from a diploid microspore mother cell?

  1. Mitosis once
  2. Meiosis once
  3. Three consecutive mitotic divisions
  4. Binary fission
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Answer: B

A diploid (2n) microspore mother cell undergoes one meiotic division to yield four haploid (n) microspores arranged in a tetrad.

7. What floral part develops into the fruit pericarp following fertilization?

  1. Ovule wall
  2. Ovary wall
  3. Petal base
  4. Stigma surface
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Answer: B

Following fertilization, the ovary wall thickens and differentiates into the pericarp, which surrounds the seed/s.

8. Which structure develops directly into the protective seed coat (testa) after successful fertilization?

  1. Ovary wall
  2. Integuments of the ovule
  3. Synergid membranes
  4. Nucellus tissue
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Answer: B

The integuments surrounding the ovule dry out and harden post-fertilization to form the protective seed coat or testa.

9. What role do synergid cells play in the female gametophyte?

  1. They store starch for embryo development.
  2. They flank the egg cell and secrete chemical signals to guide the pollen tube entrance.
  3. They form the outer pericarp layer of mature fruits.
  4. They divide by meiosis to produce polar nuclei.
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Answer: B

Synergids flank the egg cell at the micropylar opening and guide the pollen tube toward the embryo sac using chemical attractants.

10. What is the primary function of the tube nucleus inside a germinating pollen grain?

  1. Fusing with polar nuclei to form endosperm
  2. Directing pollen tube growth and enzyme secretion down the style
  3. Fusing with the egg cell to form a zygote
  4. Protecting pollen wall exine against dehydration
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Answer: B

The tube nucleus directs growth of the pollen tube toward the ovule by controlling the secretion of digestive enzymes.

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