The type of apomixis, where the embryo sac develops from any cell of the archesporium is known as
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The age of trees is determined by its
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Soon after fertilization, the fertilized egg or oospore greatly enlarges in size and divides transversely to form a
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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
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The portion of the axis between radicle and the point of attachment of the cotyledons to the axis is called the
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Common air pollutants that affect man and vegetation include
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The extremities of organism like tail, ears and legs of mammals often appear to be shorter in colder climate, according to
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Which of the following is a common example of biodegradable pollutants?
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A mutant of com, called dwarf-5, which due to a single gene mutation, appears to be expressed phenotypically because of a deficiency of
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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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The complete regular metabolic cycle of reactions of taking place in the dark reaction of photosynthesis is called as
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The structural adaptations of hydrophytes are correlated with
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Which of the following wall layers is the last to attain maturity?
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During photokinesis when only a part of the body of an animal deviates always from the source of light, the reaction is termed
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Abscisic acid is also known as stress hormone because
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The points regarding the structure of the mature embryo sac that have proved of special signification in taxonomic considerations include
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Which of the following plants belongs to "semi-mangrove" group?
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Organic substances which are synthesized in minute quantities in one part of the plant body and transported to another part where they influence specific physiological processes are known as
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The germination of lettuce seeds is
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The structural organisation of an ecosystem presented in terms of weight of organisms at each trophic level is known as
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