Welcome to your Ncert - class 9- science -Chapter 6 – Tissues 1
A man was brought up at sea level while his brother spent all his life at an altitude of 10,000 feet. The latter will have
The wax like substance present in the cell wall of onion skin is
Haversian canal in the bone of mammals are connected by small blood vessel canal called:
A typical neuron has a myelin sheath insulating its axon. It is formed from cells known as Schwann cells. Some nervous system disorders, such as adrenoleukodystrophy result from the deterioration of the myelin sheath.
Which of the following is the characteristic feature of cardiac muscles?
Haemoglobin levels in the blood samples of two persons A and B are found to be 9 gm/dL and 13 gm/dL respectively. Which statement is true with respect to the amount of oxygen supply in their body?
Number of RBC increases if one lives at higher altitude because
The generation of excitation-contraction coupling involves all the following events except
Rhythmical contraction is noticed in
Which of the following statements is incorrect?
Oxygen and carbon dioxide are transported in blood through.
Which is the correct sequence of arrangement of types of WBC in decreasing order in terms of number per mm^3 of human blood?
Which one of the following helps in keeping the body warm?
In voluntary muscle movement, which of the following process occurs only if ATP is present?
In terms of descending order of percentage proportions of leucocytes in human blood, which one is correct?
One of the factors required for the maturation of erythrocytes is
Read the statement regarding myofibril and choose the correct option:
A blood cell is moved from an isotonic solution to a hypertonic solution. Select the correct condition.
Which of these are granulocytes?
In a leaf, vascular bundles are found in:
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