2. All seed plants are heterosporous and produce pollen grains as well as seeds.
ID: 201471 • Letter: 2
Question
2. All seed plants are heterosporous and produce pollen grains as well as seeds. However, there are examples of transitions between seedless vascular plants (lack seeds; generally homosporous) and seed plants. What seedless vascular plants are heterosporous? What groups of seed plants produce pollen grains, but also have flagellated sperm that swim from the pollen tube into the ovule to fertilize the egg? plants. Consider their function in the land environment. pollen grain: microsporangium: flower: carpel: seed: fruit: endospermExplanation / Answer
1. Club mosses -lycopodiophyta - . They are also heterosporous
B. Cycads - a sperm cell of the pollen grain swims through the pollen tube using its whip-like tail, or flagella, and fertilizes the egg to form a zygote.
Pollen grain - Pollen grains represent the male portion of the reproductive process. It pass in the wind or insects legs and can join with female part of the plant and undergoes fertilization and generate new seeds.
Microsporangium - The sporangium produces spores that give rise to male gametophytes.
Flower - Major role reproduction. It is a reproductive organs of plant contains stamen and carpel. The sperm from stamen pass to ovules contain in the ovary.
Carpel - The carpels are female reproductive structures that produce egg cells.
Seed - nourishment of the developing embryo , dispersal to a new location and dormancy during unfavourable conditions.
Fruit - The functions of the fruit is to protect the seed inside and aid in its dispersal. Fleshy coloured fruits attract birds and animals and eaten by them and dispersed the seeds in the different environment.
Endosperm - It provides provides nutrition to the developing embryo in the form of starch.
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