What is a pollen grain?

a. sperm-producing gametophyte
b. egg-producing gametophyte
c. sperm-producing sporophyte
d. sperm

검증된 단계별 안내

Identify the role of a pollen grain in plant reproduction.

Understand the difference between gametophyte and sporophyte generations in plants.

Recognize that pollen grains are involved in the production of male gametes (sperm cells).

Determine whether the pollen grain itself produces sperm or if it develops into a structure that produces sperm.

Choose the option that correctly identifies the pollen grain as either a gametophyte or sporophyte and whether it produces sperm directly or indirectly.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Pollen Grain Structure

A pollen grain is a microscopic structure produced by seed plants, containing the male gametophyte. It consists of a tough outer wall called the exine, which protects the gametophyte during its transport from the male reproductive organ to the female organ of a flower.

Gametophyte vs. Sporophyte

In the plant life cycle, the gametophyte is the haploid phase that produces gametes (sperm and eggs), while the sporophyte is the diploid phase that produces spores. Pollen grains represent the male gametophyte, which is responsible for producing sperm cells for fertilization.

Pollination Process

Pollination is the transfer of pollen grains from the male anther to the female stigma of a flower. This process is crucial for sexual reproduction in flowering plants, as it allows for the fertilization of ovules by sperm cells, leading to seed development.