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Quiz Chapter 6: Sexual Reproduction in Flowering Plants

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

Question 1 of 10Score: 0

Which of the following structures constitutes the female reproductive organ (gynoecium / pistil)?

Full Question List & Answer Key

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

1. Which of the following structures constitutes the female reproductive organ (gynoecium / pistil)?

  1. Anther and Filament
  2. Stigma, Style, and Ovary
  3. Petal, Sepal, and Receptacle
  4. Pedicel and Microsporangium
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Answer: B

The gynoecium (pistil/carpel) consists of the sticky stigma, elongated style, and basal ovary containing ovules.

2. What term describes the transfer of pollen grains from the anther of one flower to the stigma of a flower on a different plant of the same species?

  1. Self-pollination
  2. Cross-pollination
  3. Parthenocarpy
  4. Vegetative propagation
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Answer: B

Cross-pollination involves pollen transfer between flowers on different individual plants of the same species, increasing genetic variation.

3. 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.

4. 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.

5. Through which microscopic pore in the ovule integuments does the pollen tube enter the embryo sac?

  1. Chalaza
  2. Micropyle
  3. Funicle
  4. Hilum
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Answer: B

The micropyle is the small opening in the ovule's protective integuments through which the pollen tube enters.

6. How many functional megaspores survive from the four produced by meiosis of a megaspore mother cell?

  1. One
  2. Two
  3. Three
  4. Four
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Answer: A

Meiosis yields four haploid megaspores, but three degenerate, leaving only one functional megaspore to develop into the embryo sac.

7. 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.

8. Which structural component of a pollen grain consists of a tough, sculpted outer layer resistant to decay?

  1. Intine
  2. Exine
  3. Middle lamella
  4. Plasmodesmata
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Answer: B

The exine is the tough, highly resistant outer wall composed of sporopollenin that protects pollen grains from harsh environmental conditions.

9. How many total nuclear mitotic divisions occur within the functional megaspore during embryo sac formation?

  1. One
  2. Two
  3. Three
  4. Four
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Answer: C

The functional megaspore undergoes three consecutive mitotic nuclear divisions without immediate cytokinesis, producing $23 = 8$ haploid nuclei.

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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