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Germpores in pollen grains in spermatoph...

Germpores in pollen grains in spermatophytes are

A

Thin area in intine

B

Thin area in exine

C

Thick area in exine

D

Site of pollen tube entry

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Pollen Grains**: Pollen grains are the male gametophytes of seed plants (spermatophytes). They are essential for the process of fertilization in flowering plants. 2. **Identifying Germ Pores**: Germ pores are specific areas on the surface of pollen grains. In the structure of a pollen grain, these are the regions where the outer layer, known as the exine, is thinner. 3. **Structure of Exine**: The exine is the outer protective layer of the pollen grain, composed of a substance called sporopollenin, which is highly resistant to decay. However, at the germ pores, this sporopollenin is absent, creating a thin area. 4. **Function of Germ Pores**: The primary function of germ pores is to facilitate the growth of the pollen tube. When pollen lands on a compatible stigma, the germ pore allows the pollen tube to emerge and grow down the style towards the ovule for fertilization. 5. **Conclusion**: Therefore, germ pores in pollen grains of spermatophytes are defined as thin areas in the exine where sporopollenin is absent, allowing for the formation and growth of the pollen tube. **Final Answer**: Germ pores in pollen grains in spermatophytes are thin areas in the exine where sporopollenin is absent, facilitating pollen tube formation. ---
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