Germpores in pollen grains in spermatophytes are

Options

A. Thin area in intine
B. Thin area in exine
C. Thick area in exine
D. Site of pollen tube entry

Answer

**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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