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Answer:
66. Methane (CH 4start subscript, 4, end subscript), the simplest hydrocarbon molecule, consists of a central carbon atom bonded to four hydrogen atoms.
67. The opening and closing of stomata are controlled by Guard cells.
68. The class of Aves and mammals have a four-chambered heart.
69. Blood carries oxygen and other important nutrients that all body organs need to stay healthy and to work properly. Your heart is a muscle, and its job is to pump blood throughout your circulatory system.
70. A cerebellum is related with skillful voluntary movement and involuntary activity, like body balance, equilibrium etc.
71. Auxins hormone controls a plant response to light and gravity.
72. Watermelon - self pollination
73. A zygote undergoes rapid cell divisions (cleavage) to form a spherical ball of cells: the blastula; this will further develop into a blastocyst.
74. Intake of contraceptive pils
75. Two phenotypes (Tall and Dwarf) are seen in F2 generation of monohybrid cross. The ratio of phenotype is 3:1
76. Wings evolved from arms used to capture small prey. (This seems rational, so we can ask whether the ancestral forms were actually doing this.) Wings evolved because bipedal animals were leaping into the air; large wings assisted leaping. (This is possible; any amount of wing could assist leaping.
77.
78. CFCs
79. katta are the most common traditional rainwater harvesting structures used mainly in Karnataka .
80. Forests are called biodiversity hotspots.
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