Mention the role of vitamin a and d in human body.write the characteristics of meristematic tissue.
Answers
Answer:
Vitamin A is a fat-soluble vitamin that is stored in the liver.
Functions-
Vitamin A helps form and maintain healthy teeth, skeletal and soft tissue, mucus membranes, and skin. It is also known as retinol because it produces the pigments in the retina of the eye.
Vitamin A promotes good eyesight, especially in low light. It also has a role in healthy pregnancy and breastfeeding.
Vitamin D is a fat-soluble vitamin that is naturally present in a few foods, is added to other foods, and is available in many nutritional supplements.
Functions-
The major biological function of vitamin D is to maintain normal blood levels of calcium and phosphorus. Vitamin D aids in the absorption of calcium, helping to form and maintain strong bones. Research also suggests that sufficient intake of this fat-soluble vitamin may provide protection from and decrease an individual’s risk of developing osteoporosis, hypertension, cancer, and several autoimmune diseases.Studies report that it triggers the body’s immune cells to produce antibodies; therefore, vitamin D promotes an overall increase in the strength of the immune system.
Characteristics of Meristematic Tissue-
1)The cells of these tissues are commonly called meristems.
2)The meristematic tissue has the quality of self-renewal. Every time the cell divides, one cell remains identical to the parent cell, and the others form specialized structures.
3)They have very small and few vacuoles.
4)The meristematic tissue is living and thin-walled.
5)The protoplasm of the cells is very dense.
6)The meristematic tissues heal the wounds of an injured plant.
7)The cells of the meristematic tissue are young and immature.
8)They do not store food.
9)They exhibit a very high metabolic activity.
10)They possess a single, large and prominent nucleus.
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