Ncert – class 9- science -Chapter 6 – Tissues 1 Welcome to your Ncert - class 9- science -Chapter 6 – Tissues 1 1. Which one of the following helps in keeping the body warm? Adipose tissue Skin Hair Sweat glands None 2. Which of the following statements is incorrect? Blood in arteries has more oxygen than blood in veins except for the pulmonary arteries and pulmonary veins. Poultry is India's most efficient converter of low fibre food stuff (which is unfit for human consumption) into highly nutritious protein food. Pesticides on entering the food chain accumulate in high amount in the bodies of higher predators which causes damage to the ecosystem. When blood is spinned in a centrifuge to separate plasma from the blood cells (RBCs, WBCs platelets etc.), blood cells constitute the supernatant and plasma constitutes the pellet. None 3. In voluntary muscle movement, which of the following process occurs only if ATP is present? Myosin to bind to actin Myosin becoming separated from actin Tropomyosin to become separated from troponin Tropomyosin to bind to troponin None 4. Which of the following is the characteristic feature of cardiac muscles? Cylindrical, branched and uninucleate Long, pointed and uninucleate Long, cylindrical and unbranched Cylindrical, unbranched and multinucleate None 5. Haversian canal in the bone of mammals are connected by small blood vessel canal called: Schlemm's canal Sinuses Portal capillaries Volkmann's canal None 6. Read the statement regarding myofibril and choose the correct option:1. Each myofibril has alternate dark and light bands.2. In the center of each A band is an elastic fiber called Z-line.3. A and I bands are arranged alternately throughout the length of myofibril.4. The sarcomere is the functional unit of contraction.5. The central part of thick filament not overlapped by a thin filament is the M line. 1, 3 and 5 alone are correct 2 and 5 alone are correct 2 and 3 alone are correct 1, 3 and 4 alone are correct. None 7. 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 More active sweat glands Less subdermal fat More active bone marrow Lower blood pressure None 8. Which is the correct sequence of arrangement of types of WBC in decreasing order in terms of number per mm^3 of human blood? Neutrophils --> Eosinophils --> Basophils Basophils --> Eosinophils --> Neutrophils Eosinophils --> Basophils --> Neutrophils Eosinophils --> Neutrophils --> Basophils None 9. Oxygen and carbon dioxide are transported in blood through. RBCs and plasma WBCs and Serum Platelets and corpuscles RBCs and WBCs None 10. Rhythmical contraction is noticed in Unstriped muscles Striped muscles In all the muscles Cardiac muscles None 11. In terms of descending order of percentage proportions of leucocytes in human blood, which one is correct? Neutrophils → → basophils → → lymphocytes → → acidophils → → monocytes Neutrophils → → monocytes → → lymphocytes → → acidophils → → basophils Neutrophils → → acidophils → → basophils → → lymphocytes → → monocytes Neutrophils → → lymphocytes → → monocytes → → acidophils → → basophils None 12. The wax like substance present in the cell wall of onion skin is Cellulose Lignin Suberin Pectin None 13. 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? More in person B than in person A No correlation between oxygen supply and the level of haemoglobin More in person A than in person B Equal in person A and person B None 14. One of the factors required for the maturation of erythrocytes is Vitamin C Vitamin B12 Vitamin D Vitamin A None 15. 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.Why is the myelin sheath important to the correct functioning of the neuron? Gaps in the myelin sheath allow for saltatory conduction, where electrical impulses jump from one covered area to another The myelin sheath blocks external signals that originate outside the neuron, preventing interference with nervous signal transmission None of these The surface of the myelin sheath carries many receptors for neurotransmitters, allowing the neuron to receive chemical signals None 16. Number of RBC increases if one lives at higher altitude because There are no germs in mountain air. There is more oxygen More heat is required in body for producing body warmth. There is less oxygen None 17. Which of these are granulocytes? Basophils, monocytes, lymphocytes Eosinophils, basophils, monocytes Neutrophils, eosinophils, basophils Neutrophils, basophils, lymphocytes None 18. A blood cell is moved from an isotonic solution to a hypertonic solution. Select the correct condition. The cell would swell. The cell membrane would be reinforced. Nothing, the cell would be in equilibrium. The cell would shrivel up. None 19. The generation of excitation-contraction coupling involves all the following events except Release of calcium from troponin Generation of end-plate potential Hydrolysis of ATP to ADP Formation of cross-linkages between actin and myosin None 20. In a leaf, vascular bundles are found in: Lower epidermis Lamina Palisade tissue Veins None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
