Ncert – class 9- science -Chapter 6 – Tissues 1 Welcome to your Ncert - class 9- science -Chapter 6 – Tissues 1 1. Which of the following statements is incorrect? Poultry is India's most efficient converter of low fibre food stuff (which is unfit for human consumption) into highly nutritious protein food. Blood in arteries has more oxygen than blood in veins except for the pulmonary arteries and pulmonary veins. 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. Pesticides on entering the food chain accumulate in high amount in the bodies of higher predators which causes damage to the ecosystem. None 2. The wax like substance present in the cell wall of onion skin is Suberin Lignin Pectin Cellulose None 3. In terms of descending order of percentage proportions of leucocytes in human blood, which one is correct? Neutrophils → → acidophils → → basophils → → lymphocytes → → monocytes Neutrophils → → monocytes → → lymphocytes → → acidophils → → basophils Neutrophils → → basophils → → lymphocytes → → acidophils → → monocytes Neutrophils → → lymphocytes → → monocytes → → acidophils → → basophils None 4. 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? The myelin sheath blocks external signals that originate outside the neuron, preventing interference with nervous signal transmission The surface of the myelin sheath carries many receptors for neurotransmitters, allowing the neuron to receive chemical signals None of these Gaps in the myelin sheath allow for saltatory conduction, where electrical impulses jump from one covered area to another None 5. The generation of excitation-contraction coupling involves all the following events except Release of calcium from troponin Generation of end-plate potential Formation of cross-linkages between actin and myosin Hydrolysis of ATP to ADP None 6. Which of these are granulocytes? Neutrophils, basophils, lymphocytes Eosinophils, basophils, monocytes Neutrophils, eosinophils, basophils Basophils, monocytes, lymphocytes None 7. Which one of the following helps in keeping the body warm? Hair Skin Sweat glands Adipose tissue None 8. Oxygen and carbon dioxide are transported in blood through. RBCs and plasma RBCs and WBCs Platelets and corpuscles WBCs and Serum None 9. Rhythmical contraction is noticed in Cardiac muscles In all the muscles Unstriped muscles Striped muscles None 10. In voluntary muscle movement, which of the following process occurs only if ATP is present? Tropomyosin to bind to troponin Myosin becoming separated from actin Myosin to bind to actin Tropomyosin to become separated from troponin None 11. A blood cell is moved from an isotonic solution to a hypertonic solution. Select the correct condition. The cell membrane would be reinforced. Nothing, the cell would be in equilibrium. The cell would shrivel up. The cell would swell. None 12. Which is the correct sequence of arrangement of types of WBC in decreasing order in terms of number per mm^3 of human blood? Eosinophils --> Basophils --> Neutrophils Basophils --> Eosinophils --> Neutrophils Neutrophils --> Eosinophils --> Basophils Eosinophils --> Neutrophils --> Basophils None 13. Number of RBC increases if one lives at higher altitude because There are no germs in mountain air. More heat is required in body for producing body warmth. There is more oxygen There is less oxygen None 14. Which of the following is the characteristic feature of cardiac muscles? Cylindrical, unbranched and multinucleate Long, pointed and uninucleate Long, cylindrical and unbranched Cylindrical, branched and uninucleate None 15. Haversian canal in the bone of mammals are connected by small blood vessel canal called: Portal capillaries Sinuses Volkmann's canal Schlemm's canal None 16. 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. 2 and 5 alone are correct 2 and 3 alone are correct 1, 3 and 5 alone are correct 1, 3 and 4 alone are correct. None 17. One of the factors required for the maturation of erythrocytes is Vitamin C Vitamin B12 Vitamin A Vitamin D None 18. 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? No correlation between oxygen supply and the level of haemoglobin More in person B than in person A Equal in person A and person B More in person A than in person B None 19. In a leaf, vascular bundles are found in: Lower epidermis Lamina Palisade tissue Veins None 20. 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 bone marrow More active sweat glands Lower blood pressure Less subdermal fat 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.
