Question

7. Explain the function of sweat glands and sebaceous gland?
8. What is the difference between closed and open circulation?
Section 3
(2x4=8)
9. How the water is absorbed by root hairs of the plant? explain with a neat
labelled diagram
10. How can you say that kidney is suitable for filtration of biological waste
from blood in man?​

Answer 1

Explanation:

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Answer 2

Answer:

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Explanation:

7). Sweat glands are used to regulate temperature and remove waste by secreting water, sodium salts, and nitrogenous waste (such as urea) onto the skin surface. ... Because both apocrine glands and sebaceous glands open into the hair follicle, apocrine sweat is mixed with sebum.

8). In the open circulation, the blood is not enclosed in the blood vessels and is pumped into a cavity called hemocoel. On the contrary, in the closed circulation, the blood is pumped through the vessels separate from the interstitial fluid of the body.

9)In higher plants, water is absorbed through root hairs from the soil water. The walls of root hairs are permeable to water and are hydrophilic in nature. They contain vacuoles filled with cell sap. Absorption of water by roots takes place by two mechanism namely, active absorption and passive absorption. During active absorption, the root cells absorb water using metabolic energy released through respi­ration. Active absorption could be either osmotic absorption or non-osmotic absorption. In osmotic absorption, water is absorbed from the soil into the xylem of the roots in the osmotic gradient. In non-osmotic absorption, water is absorbed against the osmotic gradient. In passive absorption, water absorption is due to transpiration. In this, absorption of water into the root is due to conditions originate in the top of the plant and the root cells play a passive role. Osmotic concentration of the root cells is due to the presence of soluble metabolic products synthesized in the aerial parts of the plants and later translocated downwards to the root cells.

10)Each of your kidneys is made up of about a million filtering units called nephrons. Each nephron includes a filter, called the glomerulus, and a tubule. The nephrons work through a two-step process: the glomerulus filters your blood, and the tubule returns needed substances to your blood and removes wastes.First, blood is carried into the kidneys by the renal artery (anything in the body related to the kidneys is called "renal"). The average person has 1 to 1½ gallons of blood circulating through his or her body. The kidneys filter that blood about 40 times a day!