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प्रश्न
Paheli noticed water being pulled up by a motor pump to an overhead tank of a five-storeyed building. She wondered how water moves up to great heights in the tall trees standing next to the building. Can you tell me why?
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उत्तर
The root cells absorb water and mineral salts from the soil. A continuous upward flow of water from the roots to the top of the plant is maintained due to the suction pull (transpiration pull). This suction pull is created due to the continuous loss of water from the leaf surface by the process of transpiration.
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संबंधित प्रश्न
What are the components of blood?
Which is the correct sequence of blood flow?
Match the following.
| 1. Leukaemia | (a) Thrombocytes |
| 2. Platelets | (b) Phagocyte |
| 3. Monocytes | (c) Decrease in leucocytes |
| 4. Leucopenia | (d) Blood Cancer |
| 5. AB blood group | (e) Allergic condition |
| 6. O blood group | (f) Inflammation |
| 7. Eosinophil | (g) Absence of antigen |
| 8. Neutrophils | (h) Absence of antibody |
What is the shape of RBC in human blood?
Who discovered the Rh factor? Why was it named so?
Direction: In each of the following questions a statement of assertion (A) is given and a corresponding statement of Reason (R) is given just below it. Mark the correct statement as.
Assertion: RBC plays an important role in the transport of respiratory gases.
Reason: RBC does not have cell organelles and a nucleus.
Blood is a fluid connective tissue.
Veins have valves that allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?
When a red blood corpuscle containing both A and B antigens are mixed with your blood serum, they agglutinate. Hence your blood group is ______.
Find out about blood groups and their importance.
