Give reasons for the following.
(i) Root hair has a semipermeable membrane.
(ii) Sleep is very important for good health.
(iii) The use of iodized salt in food is recommended.
(iv) Adolescents suffer from a problem of acne and pimples.
(v) Pancreas is known as a mixed gland.
Answers
Answer:
1) Root hair has thin walls. They are two layered structures. The outer layer is the cell wall and inner layer forms the cell membrane. The outer cell wall is extremely thin like that of cell wall but is semipermeable
2) Sleep plays an important role in your physical health. For example, sleep is involved in healing and repair of your heart and blood vessels. Ongoing sleep deficiency is linked to an increased risk of heart disease, kidney disease, high blood pressure, diabetes, and stroke
3) With just 3 grams a day required to meet the daily recommended iodine intake, iodized salt is the easiest way to get iodine in the body and prevent deficiencies.
4) It is especially during puberty that the level of sex hormones increases and it can cause pimples. Especially during puberty, oil glands in the skin can become overactive, producing too much of an oil called sebum. Sebum, dead skin cells, and bacteria can clog the pores in your skin, causing them to become inflamed
5) PANCREATIC ISLETS
Since the pancreas has both endocrine and exocrine functions, it is therefore a mixed gland. Its endocrine secretions are the hormones insulin and glucagon
Explanation: