Ncert – class 10- science – Chapter 6 – Control and Coordination 2 Welcome to your Ncert - class 10- science - Chapter 6 – Control and Coordination 2 1. 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 - (iii), B - (ii), C - (iv), D - (i) A - (ii), B - (v), C - (iv), D - (i) A - (v), B - (iii), C - (iv), D - (ii) A - (ii), B - (iv), C - (v), D - (iii) None 2. Which among the following hormones is toxic to plants in large concentrations, regulates protein synthesis and causes bud formation and root initiation? Auxin Gibberellins Cytokinin Ethylene None 3. 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 I, IV and V I, III and IV II, IV and V II, III and V None 4. 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 5. 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 - r, b - s, c - q, d - p a - t, b - r, c - p, d - q a - q, b - s, c - t, d - r, a - t, b - r, c - p, d - s None 6. 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? All the above Plant growth regulators Water & mineral ions Organic compound None 7. Tendrils and twiners come in contact with their support by means of Thigmotropism Nutation Anemotropism Thigmonasty None 8. More concentration of auxin in horizontally placed plants, under the influence of gravity, occurs in Lower side Upper side Both upper and lower side None of the above None 9. Choose the correct answer from the alternatives given.The mitotically active and hormone producing cells are: xylem phloem cortex, meristem None 10. 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- 4 , B- 3 , C- 1 , D- 2 A- 3, B- 4, C- 2 , D- 1 A- 2 , B- 3 , C- 4, D- 1 A- 3 , B- 4 , C- 1 , D- 2 None 11. Choose the correct answer from the alternatives given.Bakane disease of rice plants is due to the effect of: ethylene cytokinins auxins gibberellins None 12. Hormones used to speed up malting in barley, promote flowering in pineapple and delaying leaf senescence in plants are------------------ respectively. Gibberellin, Auxin, Cytokinin Auxin, Gibberellin, Cytokinin Gibberellin, Cytokinin, Auxin Cytokinin, Auxin, Gibberellin None 13. 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? Cortisol Noradrenaline Both A and B Thyroxine None 14. To speed up the malting process in brewing industry the growth hormone used is ____________. gibberellin ethylene auxin kinetin None 15. Which of the following hormones is not a growth promoter ? Abscisic acid Auxin Gibberellin Cytokinin None 16. 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 The surface of the myelin sheath carries many receptors for neurotransmitters, allowing the neuron to receive chemical signals None of these None 17. Choose the correct answer from the alternatives given.The plant hormone that causes cell elongation is: citric acid ethylene indole 3-acetic acid abscisic acid None 18. Select the correct statement regarding the Schwann cells. Surround axon of myelinated nerve fibre Form basement membrane of epithelium. Found in Haversian system of bones Support muscle fibres None 19. Geotropic response of root is due to Higher auxin content of stem Higher rate of growth in the stem Higher growth on upper side of root Lower rate of growth in the stem None 20. 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) - F, (ii) - T, (iii) - T, (iv) - F, (v) - T (i) - F, (ii) - F, (iii) - T, (iv) - T, (v) - T (i) - T, (ii) - F, (iii) - T, (iv) - T, (v) - T (i) - T, (ii) - T, (iii) - F, (iv) - F, (v) - F 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.
