Draw a sectional view of the human heart and label on it: Aorta, Pulmonary arteries, Vena cava, Left ventricle.
Why is double circulation of blood necessary in human beings?
CBSE OUTSIDE DELHI - SET 1 2009
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To transport oxygen to each and every tissue and cell of the body along with circulation of the blood.
Maximum amount of oxygen is supplied to the cells and tissues as oxy-genated blood does not mix with the deoxygenated blood.
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During the respiration of an organism A, 1 molecule of glucose produces 2 ATP molecules whereas in the respiration of another organism B, 1 molecule of glucose produces 38 ATP molecules.
Which organism is undergoing aerobic respiration?
Which organism is undergoing anaerobic respiration?
Which type of organism, A or B, can convert glucose into alcohol?
When a person eats sugary food, then organisms A present in his mouth act on sugar to produce a substance B. The substance B first dissolves the calcium salts from the top part C of the tooth and then from its middle part D forming holes E. These holes ultimately reach the part F in the lower part of tooth which contains nerves and blood vessels. The substance B irritates the nerve endings inside the tooth causing toothache.
What are (i) organisms A, and (ii) substance B?
What are (i) part C, and (ii) part D, of tooth known as?
By what name are the holes E in the tooth known?
Name the part F of the tooth.
What will happen if organisms A reach part F of the tooth known?
The transport system in plants consists of two kinds of tissues X and Y. The tissue X is made up of living cells and consists of two components A and B. The component A has tiny pores in its end walls and contains only cytoplasm but no nucleus. On the other hand, component B has cytoplasm as well as nucleus. The tissue Y is made up of dead cells and consists of two components C and D. The component C has open ends whereas component D does not have open ends. In flowering plants, either only C or both C and D transport water but D is the only water conducting tissue in non - flowering plants.
What is (i) tissue X, (ii) component A and (iii) component B?
What is (i) tissue Y, (ii) component C and (iii) component D?