Ncert – class 10- science – Chapter 6 – Control and Coordination 2 Welcome to your Ncert - class 10- science - Chapter 6 – Control and Coordination 2 1. In the context of rice diseases, match List-I with List-II using the codes given the lists. List-IList-IIa. Helminthosporium oryzae1. Gibberella fujikuroib. Rhizoctonia solani2. Balanisa oryzaec. Fusarium moniliforme3. Cochliobolus miyabeanusd. Ephelis oryzae4. Corticium sasaki A- 3 , B- 4 , C- 1 , D- 2 A- 3, B- 4, C- 2 , D- 1 A- 2 , B- 3 , C- 4, D- 1 A- 4 , B- 3 , C- 1 , D- 2 None 2. Which among the following hormones is toxic to plants in large concentrations, regulates protein synthesis and causes bud formation and root initiation? Cytokinin Gibberellins Auxin Ethylene None 3. 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 None of these The surface of the myelin sheath carries many receptors for neurotransmitters, allowing the neuron to receive chemical signals The myelin sheath blocks external signals that originate outside the neuron, preventing interference with nervous signal transmission None 4. Choose the correct answer from the alternatives given.Bakane disease of rice plants is due to the effect of: cytokinins ethylene auxins gibberellins None 5. Geotropic response of root is due to Higher growth on upper side of root Lower rate of growth in the stem Higher auxin content of stem Higher rate of growth in the stem None 6. To speed up the malting process in brewing industry the growth hormone used is ____________. kinetin ethylene auxin gibberellin None 7. In plant tissue culture experiments, high auxin to cytokinin ratio favours .............. development and high cytokinin to auxin ratio favours .............. development. Root, shoot Root, root Shoot, shoot Shoot, root None 8. Choose the correct answer from the alternatives given.The mitotically active and hormone producing cells are: cortex, meristem xylem phloem None 9. Match the columns and choose the correct combination. table { border-collapse: collapse; width: 100%; } th, td { border: 1px solid #dddddd; text-align: left; padding: 8px; } th { background-color: #f2f2f2; }III(a) Cytokinin(p) Stress hormone(b) Auxins(q) Ripening of fruits(c) Abscisic acid(r) Apical dominance (d) Ethylene(s) Bolting (t) Richmond-Lang Effect a - t, b - r, c - p, d - s a - r, b - s, c - q, d - p a - q, b - s, c - t, d - r, a - t, b - r, c - p, d - q None 10. Choose the correct answer from the alternatives given.The plant hormone that causes cell elongation is: ethylene abscisic acid citric acid indole 3-acetic acid None 11. Which of the following statements are correct?I. Pars intermedia secretes MSHII. Leydig's cell secretes progesteroneIII. Melatonin is secreted by the pineal glandIV. Myxoedema is a thyroid disorder V. Neurohypophysis secretes ACTH II, IV and V I, III and IV II, III and V I, IV and V None 12. If you see a tiger running towards you and you felt that your respiration and heartbeat has started increasing and then you also started running. Which hormone has been responsible for this? Thyroxine Both A and B Noradrenaline Cortisol None 13. Hormones used to speed up malting in barley, promote flowering in pineapple and delaying leaf senescence in plants are------------------ respectively. Cytokinin, Auxin, Gibberellin Gibberellin, Cytokinin, Auxin Gibberellin, Auxin, Cytokinin Auxin, Gibberellin, Cytokinin None 14. Which of the following is synthesized in a very small amount, sometimes it is strictly polarized or transported in a unidirectional manner from where they are synthesized to other parts? Plant growth regulators Organic compound Water & mineral ions All the above None 15. Tendrils and twiners come in contact with their support by means of Nutation Thigmotropism Anemotropism Thigmonasty None 16. Read the following five statements (i) to (v) regarding left cerebral hemisphere and select the option that correctly states the true (T) and false (F) statements.(i) It receives most modalities of sensory information from the right side of the body.(ii) It is usually larger than the right cerebral hemisphere.(iii) It is the dominant cerebral hemisphere in most individuals.(iv) It is connected to the right cerebral hemisphere by the corpus callosum.(v) It contains the main areas for the understanding and production of speech in most individuals. (i) - T, (ii) - F, (iii) - T, (iv) - T, (v) - T (i) - F, (ii) - F, (iii) - T, (iv) - T, (v) - T (i) - F, (ii) - T, (iii) - T, (iv) - F, (v) - T (i) - T, (ii) - T, (iii) - F, (iv) - F, (v) - F None 17. Match the plant hormones listed in column I with their major role listed in column II and select the corret option from the codes given below. Column IColumn II(A) Auxin(i) Fruit ripening(B) Cytokinin(ii) Phototropism(C) Abscisic acid(iii) Suppression of cell division(D) Ethylene(iv) Stomatal opening and closing (v) Growth of lateral buds A - (ii), B - (iv), C - (v), D - (iii) A - (iii), B - (ii), C - (iv), D - (i) A - (ii), B - (v), C - (iv), D - (i) A - (v), B - (iii), C - (iv), D - (ii) None 18. More concentration of auxin in horizontally placed plants, under the influence of gravity, occurs in Upper side None of the above Both upper and lower side Lower side None 19. Select the correct statement regarding the Schwann cells. Found in Haversian system of bones Form basement membrane of epithelium. Support muscle fibres Surround axon of myelinated nerve fibre None 20. Which of the following hormones is not a growth promoter ? Gibberellin Abscisic acid Auxin Cytokinin 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.
