91. As a rule, which of the following is/are destroyed by the impact of the pollen tube and the others remain intact until some time afterward?
92. Consider the following statements and choose the correct answer:
1. The waters of estuaries are among most naturally fertile in the world
2. The high productivity in estuaries is brought about by the action of tides, which promote a rapid circulation of nutrients and aid in the removal of waste products
3. "Mariculture" is done in the oyster farms of Japan where oysters are grown suspended on rafts hanging from floats
4. Estuaries and marshes are among the ecologic regions of the world that are most seriously threatened by human activities
1. The waters of estuaries are among most naturally fertile in the world
2. The high productivity in estuaries is brought about by the action of tides, which promote a rapid circulation of nutrients and aid in the removal of waste products
3. "Mariculture" is done in the oyster farms of Japan where oysters are grown suspended on rafts hanging from floats
4. Estuaries and marshes are among the ecologic regions of the world that are most seriously threatened by human activities
93. On receiving the required light energy, a chlorophyll molecule gets changed from ground state to excited state. This activated state is called
94. Oxidised from of nicotinamide adenine dinucleotide is commonly abbreviated as
95. The plants growing only in alkaline soil are known as
96. Old name for NADP was
97. How is the nitrogen taken up by the plants?
1. In the form of inorganic nitrates of nitrites.
2. In the form of organic compounds.
3. Directly taken up from the atmosphere.
1. In the form of inorganic nitrates of nitrites.
2. In the form of organic compounds.
3. Directly taken up from the atmosphere.
98. Which law of thermodynamics states that whenever energy is transformed from one kind to another, there is an increase in entropy and a decrease in the amount of useful energy?
99. Generally a plant community is determined by
100. Plants get water through the roots because of
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- Plant Anatomy and Physiology - Section 8
- Plant Anatomy and Physiology - Section 9
- Plant Anatomy and Physiology - Section 10