71. A free biradical is almost always produced when
72. The nucellus of ovule is surrounded by one or two cellular coats called
73. When reaction proceeds from one direction to another they have to overcome an energy barrier called the
74. Match List-I with List-II and select the correct answer:
List-I
List-II
a. Nitrogen
1. Structural element
b. Iron
2. Biocatalytical element
c. Molybdenum
3. Indispensable element
d. Iodine
4. Stimulating element
| List-I | List-II |
| a. Nitrogen | 1. Structural element |
| b. Iron | 2. Biocatalytical element |
| c. Molybdenum | 3. Indispensable element |
| d. Iodine | 4. Stimulating element |
75. A grain of maize is infact a dry one-seeded indehiscent fruit of
76. Rhizobia are known to produce the plant hormone
77. Who among the following considered climax vegetation "as a pattern of populations corresponding to the pattern of environmental gradients"?
78. Consider the following statements.
1. Carbon dioxide, chlorophyll and sunlight all are essential for photosynthesis.
2. Rate of photosynthesis is maximum in red light and minimum in green light.
3. Increase in O2 concentration decrease photosynthesis.
Which of the statements given above is/are correct about photosynthesis ?
1. Carbon dioxide, chlorophyll and sunlight all are essential for photosynthesis.
2. Rate of photosynthesis is maximum in red light and minimum in green light.
3. Increase in O2 concentration decrease photosynthesis.
Which of the statements given above is/are correct about photosynthesis ?
79. Which of the following is an example of bound auxin?
80. There is extreme reduction in roots and analogous organs; some are rootless, when roots are present, they are without root hairs because water and nutrient salts may be absorbed by the entire permeable plant surface under water. These adaptations belong to
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- Plant Anatomy and Physiology - Section 8
- Plant Anatomy and Physiology - Section 9
- Plant Anatomy and Physiology - Section 10