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