Sexual Reproduction in Flowering Plants – Daily Practice Problem (DPP)

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🎯 NEET 2026 Daily Practice Problem (DPP)

Class 12 | Unit 1: Reproduction | Topic: Flowering Plants

Q1. The male gametophyte in angiosperms is represented by:

  1. Anther
  2. Pollen grain
  3. Microspore mother cell
  4. Generative cell
✅ View Answer & Explanation

Correct Answer: (2) Pollen grain
Explanation: The pollen grain is the immature male gametophyte. It completes its development (forming two male gametes) either before or after shedding.

Q2. Sporopollenin is chemically:

  1. Homopolysaccharide
  2. Fatty substance
  3. Proteinaceous
  4. One of the most resistant organic materials known
✅ View Answer & Explanation

Correct Answer: (4) One of the most resistant organic materials known
Explanation: Sporopollenin forms the exine of pollen grains. It can withstand high temperatures, strong acids, and alkalis. No enzyme is known to degrade it.

Q3. A typical angiosperm embryo sac at maturity is:

  1. 8-nucleate and 8-celled
  2. 8-nucleate and 7-celled
  3. 7-nucleate and 8-celled
  4. 7-nucleate and 7-celled
✅ View Answer & Explanation

Correct Answer: (2) 8-nucleate and 7-celled
Explanation: It contains 3 antipodals, 2 synergids, 1 egg cell, and 1 central cell (with 2 polar nuclei). Total = 7 cells, 8 nuclei.

Q4. The inner most wall layer of anther which nourishes the developing pollen grains is:

  1. Epidermis
  2. Endothecium
  3. Middle layers
  4. Tapetum
✅ View Answer & Explanation

Correct Answer: (4) Tapetum
Explanation: Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus. They provide nutrition to the microspores.

Q5. Which of the following is a result of Triple Fusion?

  1. Zygote
  2. Primary Endosperm Nucleus (PEN)
  3. Embryo
  4. Seed coat
✅ View Answer & Explanation

Correct Answer: (2) Primary Endosperm Nucleus (PEN)
Explanation: Triple fusion is the fusion of the second male gamete with the two polar nuclei (secondary nucleus) to form triploid PEN.

Q6. Filiform apparatus is a characteristic feature of:

  1. Egg cell
  2. Synergids
  3. Zygote
  4. Antipodals
✅ View Answer & Explanation

Correct Answer: (2) Synergids
Explanation: The filiform apparatus at the micropylar end of synergids guides the entry of the pollen tube into the synergid.

Q7. Geitonogamy is functionally cross-pollination but genetically similar to:

  1. Xenogamy
  2. Autogamy
  3. Apogamy
  4. Allogamy
✅ View Answer & Explanation

Correct Answer: (2) Autogamy
Explanation: Geitonogamy involves the transfer of pollen from the anther to the stigma of another flower of the same plant. Hence, genetically it is autogamy.

Q8. The residual, persistent nucellus in the seed is called:

  1. Pericarp
  2. Perisperm
  3. Endosperm
  4. Scutellum
✅ View Answer & Explanation

Correct Answer: (2) Perisperm
Explanation: Perisperm is found in seeds of Black Pepper and Beet.

Q9. Which of the following is a False Fruit?

  1. Mango
  2. Banana
  3. Apple
  4. Grapes
✅ View Answer & Explanation

Correct Answer: (3) Apple
Explanation: In Apple, Strawberry, and Cashew, the thalamus contributes to fruit formation along with the ovary, hence called false fruits.

Q10. Apomixis is the development of:

  1. Fruit without fertilization
  2. Seeds without fertilization
  3. Embryo from synergids
  4. Seed from nucellus
✅ View Answer & Explanation

Correct Answer: (2) Seeds without fertilization
Explanation: Apomixis mimics sexual reproduction but produces seeds asexually (e.g., in Asteraceae and Grasses).

Q11. Emasculation is the removal of anthers from:

  1. Male parent flowers
  2. Female parent flowers
  3. Both parents
  4. Staminate flowers
✅ View Answer & Explanation

Correct Answer: (2) Female parent flowers
Explanation: If the female parent produces bisexual flowers, removal of anthers (emasculation) is necessary to prevent self-pollination.

Q12. Which of the following plants uses water for pollination?

  1. Water hyacinth
  2. Water lily
  3. Vallisneria
  4. Lotus
✅ View Answer & Explanation

Correct Answer: (3) Vallisneria
Explanation: Water hyacinth and Water lily are aquatic plants but are pollinated by insects or wind. Vallisneria and Hydrilla are water-pollinated.

Q13. In most angiosperms, pollen grains are shed at:

  1. 2-celled stage
  2. 3-celled stage
  3. 4-celled stage
  4. Single celled stage
✅ View Answer & Explanation

Correct Answer: (1) 2-celled stage
Explanation: In 60% of angiosperms, pollen is shed at the 2-celled stage (Vegetative + Generative cell). In the remaining species, the generative cell divides to form 2 male gametes (3-celled stage) before shedding.

Q14. The aleurone layer in maize grain is:

  1. Haploid
  2. Diploid
  3. Triploid
  4. Tetraploid
✅ View Answer & Explanation

Correct Answer: (3) Triploid
Explanation: The aleurone layer is the outermost proteinaceous layer of the endosperm, hence it is triploid (3n) like the rest of the endosperm.

Q15. Cleistogamous flowers are:

  1. Wind pollinated
  2. Insect pollinated
  3. Invariably autogamous
  4. Always cross-pollinated
✅ View Answer & Explanation

Correct Answer: (3) Invariably autogamous
Explanation: Cleistogamous flowers do not open at all. Thus, there is no chance of cross-pollination landing on the stigma. (Example: Viola, Oxalis).

Q16. Long silky hair coming out of the cob of maize are:

  1. Anthers
  2. Styles and Stigmas
  3. Modified leaves
  4. Bracts
✅ View Answer & Explanation

Correct Answer: (2) Styles and Stigmas
Explanation: The tassels in corn-cob are long styles and stigmas that wave in the wind to trap pollen grains.

Q17. Which of the following is an example of a parthenocarpic fruit?

  1. Orange
  2. Strawberry
  3. Banana
  4. Mango
✅ View Answer & Explanation

Correct Answer: (3) Banana
Explanation: Banana fruits develop without fertilization and are seedless (Natural Parthenocarpy).

Q18. The hilum is a scar on the:

  1. Seed, where funicle was attached
  2. Fruit, where it was attached to pedicel
  3. Fruit, where style was present
  4. Seed, where micropyle was present
✅ View Answer & Explanation

Correct Answer: (1) Seed, where funicle was attached
Explanation: The hilum represents the point of attachment of the seed to the fruit wall (via the funicle).

Q19. In Citrus and Mango, polyembryony occurs due to:

  1. Fertilization of egg by multiple sperms
  2. Nucellar cells protruding into the embryo sac
  3. Development of antipodals into embryos
  4. Multiple embryo sacs
✅ View Answer & Explanation

Correct Answer: (2) Nucellar cells protruding into the embryo sac
Explanation: Diploid nucellar cells surrounding the embryo sac start dividing, protrude into the embryo sac and develop into embryos.

Q20. Scutellum is the name of the cotyledon in:

  1. Pea
  2. Grass family
  3. Solanaceae
  4. Crucifers
✅ View Answer & Explanation

Correct Answer: (2) Grass family
Explanation: In the grass family (monocots like maize, wheat), the single large shield-shaped cotyledon is called the scutellum.

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