Question

Short Answer Type Questions

1 What is dialysis ?

ans

2 How does absorption of water and nutrients take place in the root ?

ans

3 explain the excretion in fishes birds lizards and snakes ?

ans

4. how are water and minerals transported in the plants ?

ans

5 Write the differences between arteries and veins ?

ans

6 What is heart beat ? write its importance

ans

7 explain the structure and use of stethoscope ?

ans

8 how does the heart avoid the avoid the mixing of oxygen, blood and carbon dioxide rich blood ?

ans


Class 7​

Answer 1

Answer:

1. ans=In medicine, dialysis is the process of removing excess water, solutes, and toxins from the blood in people whose kidneys can no longer perform these functions naturally. This is referred to as renal replacement therapy. The first successful dialysis was performed in 1943.

Answer 2

Answer:

1. dialysis is the process of removing excess water, solutes, and toxins from the blood in people whose kidneys can no longer perform these functions naturally.
2. Actually, most water and nutrients are absorbed by 'roots hairs',a hair-forming cell on the epidermis of a plant root. They are found only in the region of maturation of the root, and the structures allow a plant to get water and nutrients from the soil.
3. Aquatic animals like fishes, excrete cell waste as ammonia which directly dissolves in water. Some land animals like birds, lizards, snakes excrete a semi-solid, white coloured compound (uric acid). ... This is because the water evaporates from the pores of the pot, which causes cooling.
4. In plants, minerals and water are transported through the xylem cells from soil to the leaves. The xylem cells of the stem, roots, and leaves are interconnected forming a conducting channel reaching all plant parts.
5. Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body. Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation.
6. Heart rate is important because the heart's function is so important. The heart circulates oxygen and nutrient-rich blood throughout the body. ... The rhythmic beating of various chambers of heart maintains circulation of blood to transport oxygen and other substances to the different parts of the body.
7. The stethoscope is an acoustic medical device for auscultation, or listening to internal sounds of an animal or human body. It typically has a small disc-shaped resonator that is placed against the skin, and one or two tubes connected to two earpieces.
8. The heart is a unidirectional pump. Valves are present to prevent the backflow of blood. The right side pumps deoxygenated blood (low in oxygen and high in carbon dioxide) to the lungs. The left side pumps oxygenated blood (high in oxygen and low in carbon dioxide) to the organs of the body.

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