Perisperm differs from endosperm in
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In some seeds like black pepper and beet, remnants of nucellus are also persistent and this persistent nucellus is called perisperm. The cells of endosperm tissue are filled with reserve food materials and are used for the nutrition of the developing embryo. The main difference is perisperm is present in seeds and endosperm is present in the developing embryos as its reserved food which is completely consumed by is during development.
- Its formation by fusion of secondary nucleus with several sperms
- Being a haploid tissue
- Having no reserve food
- Being a diploid tissue
The Correct Option is D
Solution and Explanation
Perisperm differs from endosperm in Being a diploid tissue.
The endosperm is a tissue present inside the seeds of most angiosperms at the time of fertilization. It contains oils and protein and surrounds the embryo providing nutrition in the form of starch. These are typically triploid (3n) but can vary widely from diploid. Endosperm that is diploid, results from the fusion of a pollen nucleus with one, rather than two, maternal nuclei. They are both nutritive layers in a seed. Perisperm is a nutritive tissue of seed that develops from the nucellus and is deposited externally into the embryo sac. While the endosperm develops when the sperm cell fuses with two haploid polar nuclei (contained in the central cell) in the centre of the embryo sac (or ovule). Perisperm occurs in the seeds of black pepper, coffee, castor, cardamom, and Nymphaea.
Therefore, the correct answer is option D.
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Concepts Used:
Post-Fertilization Events
There are series of events that happen in the development of plants after their fertilization process to form a fruit from a diploid zygote. The four different developmental steps that occurs during post fertilization are:
- Development of an Endosperm: The endosperm, a tissue, present in the seed during the fertilization, precedes the development of an embryo. It is categorized into three types.
- Nuclear Formation
- Cellular Formation
- Helobial Formation
- Development of an Embryo: Embryogeny is the embryo development process and it starts developing at the micropylar end of the embryo sac in the zygote. The formation stages of embryogeny are almost the same in both the plants dicot and monocot, regardless of their structure.
- Monocot Embryo
- Dicot Embryo
- Development of a Seed: A Seed has Three Body Parts:
- Seed Coat
- Cotyledon
- Embryo Axis
- Formation of a Fruit: After the cell division and separation in the ovary, it is changed into fruit because of stimuli received from fertilization just as developing seed. The pericarp which might be fleshy like guava, tomato, or cucumber or might be weathered and dry like pea, bean, or mustard. After all the events the two types of fruits are formed:
- True Fruit
- False Fruit