Question:
Senescence is the time when age associated defects are manifested.
Certain genes may be undergoing sequential switching on and off during one?? life.
Senescence is the time when age associated defects are manifested.
Certain genes may be undergoing sequential switching on and off during one?? life.
Updated On: Jun 27, 2023
- If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
- If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
- If Assertion is true but Reason is false
- If both Assertion and Reason are false
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The Correct Option is A
Approach Solution - 1
Senescence is the process of ageing which involves the progressive deterioration in activity of cell's tissues organs etc. Ageing may be due to gradual accumulation of somatic mutations or too late expression of genes not subject to strong selection.
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Senescence is the term used to describe the time right before ageing. In plants, this period is characterized by a variety of changes, including the fading of the leaves and the drying of various components. These flaws are connected to the action of a few genes that are controlled during the development period. Either the genes are turned off or the aging-related genes are turned on.
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Concepts Used:
Human Reproduction
Reproduction in human beings involves the fusion of male and female gametes that produces in their reproductive system.
Male Reproductive System:
The male reproductive system comprises:
- Testicles (testes): A pair of oval-shaped organs masked in a pouch known as the scrotum. They manage the production of sperms and the male hormone testosterone.
- Scrotum: It is a sac-like organ that hangs under the penis and behind it. It is the house of the testes, or testicles, and maintains a temperature that is needed for the production of sperm by it.
- Vas deferens: The sperms produced in testes are stored in a tube known as the epididymis. Here the sperms get matured and pass to the urethra via the muscular tube known as vas deferens.
- Accessory glands: This includes three glands, namely the prostate gland, seminal vesicles, and Cowper’s gland. The secretions from the mentioned three glands mix to form a fluid known as semen. Semen nourishes the sperm, raises the volume, and helps in lubrication.
- Penis: The penis is a cylindrical tube that serves as both an excretory organ, and a reproductive organ. It transfers sperms into the vagina during sexual intercourse.
Female Reproductive System:
The female reproductive system is active before, during, and after fertilization as well. It comprises the following parts:
- A pair of ovaries: A pair of ovaries produce and stores ovum in them. They also produce a female hormone known to be estrogen.
- Fallopian tubes (Oviducts): They are the area of fertilization. They connect both the ovaries with the uterus.
- Uterus: Uterus is the place of development for the embryo.
- Vagina: The part that connects the cervix to the external female body parts is called a vagina. It is the passage for the penis during coitus as well as a fetus during transfer.