Module: | Pre-fertilization: Micro/Megasporogenesis
Q32: Consider the following statements regarding the evolutionary advantages of seeds in angiosperms:
1. Unlike bryophytes and pteridophytes, the reproductive processes of pollination and fertilization in seed plants are entirely independent of water.
2. Seeds possess a hard, sclerified seed coat that provides critical physical protection to the vulnerable young embryo against harsh environmental conditions.
3. Being the product of sexual reproduction, seeds generate new genetic combinations leading to variations that drive evolutionary adaptation.
Which of the above statements is/are correct?
2. Seeds possess a hard, sclerified seed coat that provides critical physical protection to the vulnerable young embryo against harsh environmental conditions.
3. Being the product of sexual reproduction, seeds generate new genetic combinations leading to variations that drive evolutionary adaptation.
Which of the above statements is/are correct?
✅ Correct Answer: D
The correct option is D. All three statements correctly outline the evolutionary supremacy of seeds.
The transition to seed-bearing habits allowed gymnosperms and angiosperms to conquer dry land.
Lower plants (algae, bryophytes, pteridophytes) require a film of water for their flagellated male gametes to swim to the egg.
Angiosperms circumvented this by evolving pollen grains carried by wind or animals, and pollen tubes that deliver non-motile gametes directly to the ovule, making reproduction independent of external water (Statement 1). Structurally, the integuments of the ovule harden into tough seed coats (testa and tegmen), shielding the embryo from mechanical damage and extreme weather (Statement 2). Finally, because the zygote within the seed is formed via meiosis and syngamy, it guarantees genetic recombination, ensuring the offspring possess variations necessary to adapt to changing ecosystems (Statement 3).
The transition to seed-bearing habits allowed gymnosperms and angiosperms to conquer dry land.
Lower plants (algae, bryophytes, pteridophytes) require a film of water for their flagellated male gametes to swim to the egg.
Angiosperms circumvented this by evolving pollen grains carried by wind or animals, and pollen tubes that deliver non-motile gametes directly to the ovule, making reproduction independent of external water (Statement 1). Structurally, the integuments of the ovule harden into tough seed coats (testa and tegmen), shielding the embryo from mechanical damage and extreme weather (Statement 2). Finally, because the zygote within the seed is formed via meiosis and syngamy, it guarantees genetic recombination, ensuring the offspring possess variations necessary to adapt to changing ecosystems (Statement 3).