71. Movements due to light are shown by A. flowering plants B. lower plants C. all land plants D. all the plants ✅ The correct answer is option A.
72. Plants that grow in saline water are called A. halophytes B. hydrophytes C. mesophytes D. thallophytes ✅ The correct answer is option A.
73. On which of the following plants did Gregor Mendal perform his classical experiment? A. Gram B. Maize C. Pea D. Wheat ✅ The correct answer is option C.
74. Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false? A. By cyanobacteria B. By electrical discharges in the atmosphere C. By industrially synthesised fertilizer D. By denitrification ✅ The correct answer is option D.
75. Pigmentation of skin is due to A. lymphocytes B. monocytes C. leucocytes D. melanocytes ✅ The correct answer is option D.
76. Photosynthesis is a process A. reductive and exergonic B. reductive and catabolic C. reductive, endergonic and catabolic D. reductive, endergonic and anabolic ✅ The correct answer is option D.
77. Prokaryotic cells lack A. nucleolus B. nuclear membrane C. membrane bound by organelles D. All of these ✅ The correct answer is option D.
78. out of proteins, lipids and carbohydrates present in a cell membrane, what is true? A. Lipids are maximum B. Carbohydrates are minimum C. Carbohydrates are maximum D. All three are in equal proportion ✅ The correct answer is option B.
80. Plants absorb dissolved nitrates from soil and convert them into A. free nitrogen B. urea C. ammonia D. proteins ✅ The correct answer is option A.