Perisperm is:
Show Hint
Perisperm is the nutritive tissue surrounding the embryo in certain seeds and developing from the nucellus of the ovule.
- degenerate part of synergids
- peripheral part of endosperm
- degenerate part of secondary nucleus
- remnant of nucellus
The Correct Option is D
Solution and Explanation
Perisperm is the persistent remnant of the nucellus in seeds, not the endosperm. It is found in Piperaceae and Scitaminaceae.
- It gets formed when the nucellus isn't completely used up.
- It is present in a thin layer in the seed enclosing the endosperm and the embryo.
- Perisperm is the nutritive tissue surrounding the embryo in certain seeds and developing from the nucellus of the ovule.
- After double fertilization, the remnants of the nucellus of the ovule is known as perisperm.
Therefore, the correct option is: Perisperm is the persistent nucellus.
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Concepts Used:
Female Reproductive System
The female reproductive system provides various functions. The ovaries produce the egg cells known as the ova or oocytes. The oocytes are then taken to the fallopian tube where fertilization by a sperm may occur. The fertilized egg is then transferred to the uterus, where the uterine lining has thickened in regard to the normal hormones of the reproductive cycle. Once in the uterus, the fertilized egg can implant into the thickened uterine lining and continues to develop. If implantation does not take place, the uterine lining is shed as menstrual flow. In addition, the female reproductive system produces female sex hormones that preserve the reproductive cycle.
During menopause, the female reproductive system slowly stops making the female hormones that are required for the reproductive cycle work. At this stage, menstrual cycles can become irregular and finally stops. One year after menstrual cycles pause, the woman is deemed to be menopausal.