Author Archives: I am hassan

Nastic Movement

Nastic Movements A growth or turgor movement of a plant organ in response to an external stimulus, mostly light intensity and temperature, in which the direction of the response is not determined by the direction of the stimulus. The direction of the movement is determined by the structure of the responding organ. The nasties are brought about by growth resembling ...

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Geotropism

Geotropism When plants are placed horizontally they exhibit growth response to the stimulus of one-sided gravity. It is called geotropism or gravitropism. The tip of the stem grows away from the pull of the gravity (negative geotropism) and the root tips grow towards it (positive geotropism). The plant responses to unilateral gravity are growth movements because the resulting curvatures occurs ...

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Plant Movement

Plant Movement It is a characteristics of plants, except for few unicellular plants such as Chlaymydomonas, that they do not exhibit movement of entire organism (locomotion). However, individual plant organs (stems, roots and leaves) exhibit movements. These movements are triggered in response to external environmental stimuli or by an internal timing mechanism, the biological clock. Therefore, these movements are also ...

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Nature of Vernalization Stimulus

Nature of Vernalization Stimulus – Vernalin or Gibberellin Many attempts were made to isolate vernalin but all failed. However, Anton Lang in 1957 showed that application of gibberellins to certain vernalization requiring biennials like henbane induce flowering in them without cold temperature treatment. Purvis in 1961 induced winter annuals to flowers induced by treating their seeds with gibberellins. It was ...

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Vernalization

Vernalization Vernalization is a process that promotes flowering by cold temperature treatment given to a seed that has imbibed water or to a growing a plant. Like photoperiodism, vernalization is also an inductive effect leading to flowering sometime after the cold temperature treatment. If cold temperature treatment is not provided to cold requiring plants they may either show delayed flowering ...

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Anatomy And Physiology Quiz

Extensive Questions Q.1. Describe the role of auxins in various developmental phenomenon in plants? Q.2. Write a note on gibberellins? Q.3. Write a note on application of plant growth hormones in agriculture? Q.4. (I) Classify plant hormones? (II) Discuss the synergetic role of hormones in controlling growth? Q.5. Describe the distribution and functions of gibberellins in plant growth? Q.6. (I) ...

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Plant Tissue Culture Applications

Applications of Plant Tissue Culture Application in Research Work Tissue culture techniques have helped in research work variously: By culturing different tissues on artificial media, knowledge about requirements of various chemical substances (minerals) necessary for the growth of those tissues is found. Organogenesis has been studied by inducing formation of roots, shoot tips, etc. From callus on nutrient mediums. Tissue ...

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Plant Tissue Culture Techniques and Applications

The term plant tissue culture is commonly used to describe in vitro (in glassware) and aseptic cultivation of any plant part on a nutrient medium. Tissue culture technique has provided an efficient tool for modern plant breeding. Plant tissue culture technology is based on three fundamental principles. 1. The plant part (ex-plant) must be isolated from the rest of the ...

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Abscisic Acid- ABA

Abscissic Acid (ABA) Abscissic acid (ABA) is a ubiquitous plant hormone that inhibits growth of vascular plants. It has been detected in mosses but appears to be absent in liverworts. Several fungal genera make abscissic acid as a secondary metabolite. In algae and liverworts, a compound similar to abscissic acid called lunularic acid appears to play physiologic role similar to ...

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Ethylene

A Volatile Growth Inhibitor Ethylene, a growth inhibitor, is the simplest known olefin. It is lighter than air under physiological conditions. It is flammable and readily undergoes oxidation to ethylene oxide, and can be hydrolyzed to ethylene glycol. In most plant tissues ethylene can be completely oxidized to CO2. Ethylene is released easily from the tissue and diffuses in gas ...

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