61. The spring wood and the summer wood which form a cylindrical layer of secondary xylem during one season's growth constitute a/an
62. The first link in the food chain is the
63. Which of the following elements is obtained from the sea algae?
64. The Arteether medicine which is used to cure malaria is obtained from a
65. The part of root involved in water absorption is zone of
66. Which of the following antibiotics blocks protein synthesis by acting as an analogue to the adenosine terminal of phenylalanyl tRNA, and thus displacing aminoacyl tRNA?
67. In Phlox, the vascular cylinder is continuous and consists of a single layered pericycle, a complete ring of phloem, a complete ring of cambium and a complete cylinder of xylem with a pith in the centre. This arrangement of the vascular tissue is called
68. In Clostridium aceticum, the final electron acceptor during respiration is
69. Desert plants are generally
70. During classification, only those characters are taken into consideration which
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