41. The type of apomixis, where the embryo sac develops from any cell of the archesporium is known as
42. The age of trees is determined by its
43. Soon after fertilization, the fertilized egg or oospore greatly enlarges in size and divides transversely to form a
44. Consider the following statements and choose the correct answer:
1. Hygroscopicity may be defined as the power of solids to adsorb water upon their surface
2. A finely divided soil holds less amount of water drawn from below than a soil with larger particles
3. Water held by capillary action is influenced by gravity
4. The gravitational water is that surplus of water which, after rain, gradually sinks downward, under the influence of gravity
1. Hygroscopicity may be defined as the power of solids to adsorb water upon their surface
2. A finely divided soil holds less amount of water drawn from below than a soil with larger particles
3. Water held by capillary action is influenced by gravity
4. The gravitational water is that surplus of water which, after rain, gradually sinks downward, under the influence of gravity
45. The portion of the axis between radicle and the point of attachment of the cotyledons to the axis is called the
46. Common air pollutants that affect man and vegetation include
47. The extremities of organism like tail, ears and legs of mammals often appear to be shorter in colder climate, according to
48. Which of the following is a common example of biodegradable pollutants?
49. A mutant of com, called dwarf-5, which due to a single gene mutation, appears to be expressed phenotypically because of a deficiency of
50. Consider the following statements regarding the importance of diffusion and choose the correct answer:
1. The exchange of gases takes place by the principle of dependent diffusion
2. The process of diffusion is involved in transpiration of water vapours
3. The ions are absorbed by the simple diffusion during passive salt uptake
4. Diffusion is an effective means of transport of substances over a very short distance and helps in the translocation of food materials
1. The exchange of gases takes place by the principle of dependent diffusion
2. The process of diffusion is involved in transpiration of water vapours
3. The ions are absorbed by the simple diffusion during passive salt uptake
4. Diffusion is an effective means of transport of substances over a very short distance and helps in the translocation of food materials
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- Plant Anatomy and Physiology - Section 2
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- Plant Anatomy and Physiology - Section 5
- Plant Anatomy and Physiology - Section 6
- Plant Anatomy and Physiology - Section 7
- Plant Anatomy and Physiology - Section 8
- Plant Anatomy and Physiology - Section 9
- Plant Anatomy and Physiology - Section 10