NEET BIOLOGY

Detailed explanation-1: -Two haploid gametes fuse together to form a diploid zygote. This results in a sporophyte. The sporophyte is formed by multiple rounds of mitosis and is a multicellular organism. On reaching maturity, the sporophyte develops reproductive organs known as sporangia.

Detailed explanation-2: -The sexual phase, called the gametophyte generation, produces gametes, or sex cells, and the asexual phase, or sporophyte generation, produces spores asexually. In terms of chromosomes, the gametophyte is haploid (has a single set of chromosomes), and the sporophyte is diploid (has a double set).

Detailed explanation-3: -The sporophyte is diploid, but the spores are haploid. The spores disperse and germinate into new gametophytes, repeating the process (see Figure 1.4.

Detailed explanation-4: -In plants, the sporophyte generation is that phase in their life cycle that begins with the union of two single-celled haploid gametes. This union of haploid (n) gametes results in the formation of a single-celled diploid (2n) zygote. The zygote germinates and grows by going through a series of mitotic divisions.

Detailed explanation-5: -The ‘alternation of generations’ in the life cycle is thus between a diploid (2n) generation of sporophytes and a haploid (n) generation of gametophytes.