How 2, 4-D helps in preparing weed- free lawns ? from Biology

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Plant Growth and Development

Short Answer Type

41. Name the most widely used commercial compound of ethylene.

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42. Name the stress hormone.

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43. ABA are derivatives of ?

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44. Namethe three phases of the period of growth

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45. Name a phytohormone which has also been isolated from humman urine.

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46. How 2, 4-D helps in preparing weed- free lawns ?

2, 4-D kills the dicotyledonous weeds but does not affect the mature monocotyledonous plants. Thus, it is used to prepare weed-free lawns by gardeners.

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47. What does the foliar spray of NAA and 2, 4-D cause in Litchi and Pineapple ?

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48. Which hormone is sprayed on sugarcane for increasing yield ?

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49. What is chemical name of kinetin ?

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50. Which is most widely used hormone in agriculture and why?

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