Question

Sugar secreated by stigma during pollen tube germination

Answer 1

Answer:

Explanation:

Following meiosis, the microspore develops into pollen, the male gametophyte. ... When pollen lands on the stigma, the pollen hydrates and this causes a protuberance of the tip of the pollen tube (pollen tube germination) before it then penetrates into the pistil tissue (Sze et al., 2014).

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Answer 2

Answer:

Sucrose is use for pollen germination as it helps in formation of pollen tubes, in vitro. various criteria is essential for pollen germination which is fullfilled by sucrose such as providing preferable osmotic pressure and substrate for the metabolism(by providing energy during growth) of pollen.