write the spores fertilization change in plants
Answers
Explanation:
In flowering plants, the pollen grain contains male gamete and the ovule contains female gamete.
The pollen grain is double walled structure. The outer wall is called as an exine and the inner wall is called as an intine.
The nucleus is divided in two parts which are called as tube cell and generative cell respectively. The generative cell is the male gamete.
The pollen is transferred to the stigma of the flower for pollination in this stage.
An ovule is the inner part of ovary which have two integuments, an outer integuments and inner integuments with a small opening called as a micropile for the entry of pollen tube.
The integuments enclose nucellus which is a nutritive layer and an embryo sac. An embryo sac contains one egg cell, two synergids, three antipodal cells and a central cell with two pollar nuclei.
Answer:
Plants that reproduce by spores
Ferns, mosses, liverworts and green algae are all plants that have spores. Spore plants have a different life cycle. ... Fertilisation of the spores takes place away from the parent, usually in a damp place. An embryo is formed and a new plant grows from it.
Explanation:
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