Which hormone is found in the gaseous form?
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Biology GK · all questionsPlant Anatomy and Physiology
Plant Anatomy and Physiology
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In the Tetrameles - Stereospermum - Cedrela formation which of the following associations is recognised?
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Which of the following react with haemoglobin, forming methemoglobin which will not take up oxygen?
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Internally, hydathode shows a group of loosely arranged parenchymatous cells called as
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The hydrogen pairs released in the oxidation steps of Krebs cycle end up ultimately in combination with
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The point at which the respiratory quotient (RQ) value reaches unity at a certain oxygen concentration is called
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Most auxins present in Avena coleoptile sections seem to be there through
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Consider the following statements and choose the correct answer:
1. Depending on the nature of habitats from which they originate, succession may be of several types
2. A succession beginning in a dry area is known as halosere
3. The xere habitat is controlled by climatic factors
4. In climax habitat, generally no fresh invasion takes place
1. Depending on the nature of habitats from which they originate, succession may be of several types
2. A succession beginning in a dry area is known as halosere
3. The xere habitat is controlled by climatic factors
4. In climax habitat, generally no fresh invasion takes place
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The only absolute deserts, where little or no rain ever falls, are those of
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Water soluble pigments found in plant cell vacuoles are
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Alternaria blights of cereals, vegetables and fruit crops are controlled by
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In the microspore, the outer variously sculptured layer, sexine remains attached to the nexine by means of
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A plant hormone used for inducing morphogenesis in plant tissue culture is
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Consider the following statements and choose the correct answer:
1. Average density of soil is 2.65 gms. per ml.
2. The spaces present between soil particles in a given volume of soil are called pore spaces
3. Porosity of the soil decreases with the increase in the percentage of organic matter in the soil
4. Macro-pore spaces have little water holding capacity and allow free movement of moisture and air in the soil under normal condition
1. Average density of soil is 2.65 gms. per ml.
2. The spaces present between soil particles in a given volume of soil are called pore spaces
3. Porosity of the soil decreases with the increase in the percentage of organic matter in the soil
4. Macro-pore spaces have little water holding capacity and allow free movement of moisture and air in the soil under normal condition
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The characteristic features of high altitude environment or alpine biome include
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Match List-I (Phases of Calvin cycle) with List-II (Reactions) and choose the correct answer:
| List-I | List-II |
| a. Phase I | 1. Glycolytic reversal |
| b. Phase II | 2. Regeneration of RUBP |
| c. Phase III | 3. Carboxylation |
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Pfr form of phytochrome below a critical level will
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An increase in the stability of the plants towards high temperature reversal is caused by
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Which of the following enzymes is an example of a transferase?
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The macro-nutrients provided by inorganic fertilisers are
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