Question

What are pollen grains and how is pollentube formed

Answer 1

When the pollen reaches the pistil or female cone, a pollen tube is formed, which transports the sperm to the ovule containing the female gametophyte. The term pollination refers to the transfer of pollen grains from the anther to the stigma of a flower.In non-flowering seed plants, pollengerminates in the pollen chamber, located beneath the micropyle, underneath the integuments of the ovule. A pollen tube is produced, which grows into the nucellus to provide nutrients for the developing sperm cells.Pollen grains are microscopic structures that carry the male reproductive cell of plants. The inside of the grain contains cytoplasm along with the tube cell (which becomes the pollen tube) and the generative cell (which releases the sperm nuclei). The outer shell is made of two layers.

hope it may help you dear please mark as brainliest answer :-)

Answer 2

Hii dear!!!

Gd morning.

Have a nice day ahead!!!

⇒A pollen grain is a microscopic body that contains the male reproductive cell of a plant.

--------------------------------------------------------------------------------------------------------------

• A pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates.
• Pollen tubes grow freely in stigmatic fluid, not along papillar or epidermal cell surfaces.
• Multicellular papillae emerge from an epidermal layer that is underlain by a few distinct layers of periclinally oriented cells with wide intercellular spaces.
• Pollen tubes grow downward between papillae to enter the subdermal region.

Hope it helps u.