Question

Is rice endospermic seed?

Answer 1

Hint: Those seeds that contain larger endosperm and less space and also surround the embryo of the seed are called endospermic seeds, it gives nutrition to the tissues. They are also called the albuminous seeds and occur after the process of fertilization.

Complete answer:
The rice seed contains endosperm which helps the germinating seed to store food and maintains the hydration in the seed during germination. The food stored concerts into active vitamins, proteins, fatty acids, and other nutrients in the endosperm. They increase in amount when the carbohydrates contents are more. At the time of germination, the complex food materials get converted into a simpler form that is easier to absorb. When the seeds are soaked in water then they start to germinate and when the dormant seeds are hydrated then their metabolic activity is initiated. The endosperm is found in a mature seed stage in the form of storage tissue and the seeds are known as albuminous or endosperms. In certain species, It is found to be distributed between both the endosperm and the embryo. It stores fat and other main starch when maturated.

Additional information:
The endosperm is a tissue that is formed after fertilization and is produced inside the seeds of most flowering plants. It is triploid in nature that means it consists of three chromosomes and is surrounded by the embryo. It provides nutrition in the form of starch. In animal diets, the endosperm is a source of nutrition as it also contains oils and proteins. The seeds in the orchids contain no endosperm. In their early developmental stage, they are mycoheterotrophic while the endosperm does not develop in some species. The grain consists of the endosperm which is the nutritious part of the seed. The outermost layer of the endosperm is aleurone which is present in all small grains and is retained in many dicot seeds with transient endosperm. During germination, it secretes the amylase enzyme which breaks the starch into sugars found in the endosperm to nourish the growing seedling.

Note:
The ploidy level in the case of the gymnosperms and the angiosperms is different. In the case of the gymnosperm, the endosperm has a haploid ploidy level while in the case of angiosperms the ploidy level is diploid. In gymnosperms, the formation of the endosperm is a pre-fertilization event while in angiosperms it is a post-fertilization event.