ICSE Class 9 Biology Chapter 6 Selina Concise Solutions - Free PDF Download
FAQs on Concise Biology Class 9 ICSE Solutions for Chapter 6 - Seeds: Structure and Germination
The ovary wall breaks down in the flowering plants, allowing the contents of the ovary to mix with other tissues in the plant, forming two structures. One is a dry mass called a megasporangium and one is a wet mass called an oogonium.
Megasporangium: A dry structure where there are no fertilized eggs present. Megasporangia produce more sporophytes than oogonia/spore mother cells.
Oogonium: A moist structure where fertilized eggs and their nuclei remain and produce daughters similar to themselves by mitosis. Oocytes will eventually be delivered through oogenesis and form seed-bearing capsules or small flowers inside of megasporangia.
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The seed structure can be defined according to the number of layers that exist in a seed. The number of layers is dependent on the species’ seed coat and ability to store food reserves. Seeds with thicker seed coats produce fruits with greater numbers of layers than seeds with thinner coats, which has led to speculation about how plant species dispersed by birds may have evolved. There are three classifications of seeds: simple, indeterminate, and determinate. Simple seeds lack an outer layer of skin while indeterminate ones have one layer while determinate ones have two-three plastids inside their shell.
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