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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. 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.

2. 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.

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. 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.

5. 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.

6. Which enzyme group is secreted by the growing pollen tube tip to digest style tissues?

  1. Amylase and Lipase
  2. Cellulase and Pectinase
  3. DNA polymerase and Ligase
  4. Pepsin and Trypsin
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Answer: B

Pollen tubes secrete digestive enzymes like cellulase and pectinase to breakdown cell wall components (cellulose and pectin) in style tissues.

7. What evolutionary advantage does double fertilization offer to flowering plants?

  1. It prevents cross-pollination by foreign plant species.
  2. It guarantees nutrient storage tissue (endosperm) develops only when fertilization succeeds.
  3. It allows seeds to germinate without absorbing water.
  4. It eliminates the requirement for meiosis in plant life cycles.
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Answer: B

Double fertilization ensures that nutrient-rich endosperm tissue is produced only when an egg cell is fertilized, preventing energy waste.

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 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.

10. 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.

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