Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Phototropism - Root and Shoot Morphogenesis
Paratonic growth movement of part of a plant in response to light, e.g. bending of stems of indoor plants towards a window, brought about by increased elongation of cells in growth region at tip of stem on shaded side. Coleoptiles of dark grown Avena seedlings bend towards light, when we provide unilateral light. The tip is found to be playing a role. Actually the tip is site of auxin production. If the tip is removed there is no response to unilateral light. But an agar block containing auxins can substitute for the tip and coleoptile would bend towards the light as if it had not been decapitated. The coleoptile bends towards light because of unequal elongation of cells on two sides. The cells on the darker side elongate faster than those cells on two sides exposed to light.
Generally accepted that effect is due to greater concentration of auxin on dark side than on side facing light but some recent evidence suggests asymmetric distribution of some co-factor that influences auxin effect. Shoots always bend and grow towards light. It is an adaptive mechanism, no doubt. Here, also the auxin is agents that mediate light control just as in coleoptile. One question that needs to be asked is whether the extent of phototropism is proportional to the duration of exposure to light. Secondly, whether the magnitude of curvature is proportional to the energy content of the inducing light.
Explain the process of Absorption of Fats? After digestion, only 25% of triglycerides are broken completely to glycerol and fatty acids. Major digestion product is 2-monoacylgl
Examination is begun by placing the transducer in left parasternal region, usually in the third or fourth left intercostal space. From this position, a sector image of the heart
How many carbon dioxide molecules are liberated after each cycle of the Krebs cycle? For a single glucose how many carbon dioxide molecules were already liberated by the aerobic re
discuss chromosomal theory of heredity.
State the changes in society which could contribute to a falling death rate. The changes in society which could contribute to a falling death rate are: (i) improvements in
Explain Cytological Approach in Taxonomy Cytotaxonomy deals with all the aspects of taxonomy at a cellular level. This includes, the structural, genetic and biochemical aspect
Q. How is the skin involved in the regulation of body temperature? Skin is one of various organ systems participating in maintaining a core temperature, meaning the temperature
Explain the term Indirect Calorimetry? This method estimates energy expenditure by determining the oxygen consumption and carbon dioxide production of the body or a cell over a
Describe the appearance of a single E. coli colony. Why can it be considered genetically homogenous?
Explain briefly why 'greenhouse' gases lead to global warming. The greenhouse gases do not interfere with the short-wave radiation reaching the Earth from the sun but take up t
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd