Describe how you get from the pollen grain release to the 2 sperm: of The DETAIL
ID: 162938 • Letter: D
Question
Describe how you get from the pollen grain release to the 2 sperm: of The DETAILS HERE! enzyme that digot a hole in The Pol tube cell secreto arises) The sperm cell Sta wall (A hyphae-1 lae pollen tube will divide to Pollen tune tip oo H grows. The spermm cell vmhagellated sperm The Comptetely eliminates swimming sperm(A Huge evolutionary advance 7. How did the pollen grain heip the Gymnosperms move into more arid environments than the Seedless Vascular Plants lived in? 8. Pollen forms in the male cone. Pollen travels to the female cone by wind and land micropyle of the female cone. Fertilization of the egg inside the female cone w the production of the seed. a)Define Pollination: The tm2 r of pdlen to 1he kmdle argo Seed Rants raw one cone scale of a female cone as it appears at PREpollination: KAdd and Label the nucellus, integuments. micropyle. and megasporocyte) Integument ucellu3 N MicropnyleExplanation / Answer
Ans 7
Seeds and pollen are the two adaptations to draught that distinguish seed plants fron seedless plants . Both these adaptation were critical for the colonization of land. They both allowed the seed plants to break their dependence on water for reproduction and development of embryo and to conquer the dry land. The pollen grains carry the male gametes of the plant which is encased in protective coat that prevents its dessication and mechanical damage. They carry the plant genes far away from the sporophyte and avoiding the competition from other plants. This is the reason for their diversification which was possible due to seeds and pollen grains.