Question

comparative account of male gametophyte of cycas and Gnetum​

Answer 1

Answer:

Explanation:

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Male Gametophyte of Cycas:

1. Microspores, which develop into male gametophytes, are un-winged in Cycas.

2.Pollination takes place at 3-celled stage in cycas, i.e. a prothallial cell, a generative cell and a tube cell.

3. Two motile male gametes, with several spiral bands of cilia, develop from generative cells in cycas.

4. Entire developmental process of male gametophyte in cycas completes within a few months.

Male Gametophyte of Pinus:

1. in pinus microspores are winged.

2.Pollination takes place at 4-celled stage in pinus, i.e. two prothallial cells, a generative cell and a tube cell.

3. there are two non-motile male gametes in pinus, without any cilia, develop from generative cell.

4. About one full year is required to complete the entire process of male gametophyte development in pinus.

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Answer 2

Male Gametophyte Cycas and Gnetum

Explanation:

Male Gametophyte of Cycas  

• Microspores, which form into male gametophytes, are un-winged in Cycas
• Only one prothallial cell is available in cycas. Pollination takes place at 3-celled arrange in cycas, for example a prothallial cell, a generative cell and a tube cell

Male Gametophyte of Gnetum​  

• They are uninucleate and stay encompassed by a thick and spiny exine and thin intine
• Develop pollen grains are shed at three-nucleate stage
• These incorporate prothallial core, tube core and generative core ( Upper) in Gnetum Africanism