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Nastic and Epinastic Responses
Paratonic variation movements of plant parts in which direction of movement is independent of the direction of stimulus. Nastic responses are like closing of leaflets by touch (E.g. Mimosa pudica) and Epinastic responses are like bending downward of the petiole bringing the leaf to a hanging position. Ethylene causes epinasty of leaves by promoting elongation of cells on the upper side. If one half of a leaf of plant like xanthium is shaded, then the corresponding site of the petiole elongation so that the petiole bends displacing the leaf blade towards irradiated side. Secondly upward bending of the shaded side of the leaf (hyponasty) this mechanism helps the plant in avoiding overlapping of leaves and maximum exposure to Light. The canoppy forms leaf mosaics.
Why does bark often break and die naturally? Bark is the mature periderm of the branches, stem and roots. It breaks and dies when these structures grow and thus the peridermal
Define Food Components Other Than Essential Nutrients? In the previous units so far, we have read about the six major nutrients, which are essential for us. Though these vary i
what is the warmest and coldest parts of the boy
Anticoagulation in Prosthetic Valves The usual anticoagulants used are: (I) Warfarin sodium, and (2) Acitrorn (coumarin derivative). In patients who had thromboembolism
Photoorganoheterotrophs and Chemoorganoheterotrophs - Nutritional Types (1) Photoorganoheterotrophs - These microorganisms use light as a source of energy and organic compound
Haemocyanin - Respiratory Pigments This pigment is found in several arthropods and molluscs. Haemocyanins do not consist of haee groups. The metal they consist of is copper, w
Where are blood cells made in the body? Blood cells are made in the red bone marrow, e.g. in the ribs, sternum or vertebrae.
DONO R SELECTION & KIDNEY PRESERVATION - A kidney donor should be free of hypertension, diabetes & melignancy. Cardaveric kidney is obtained from brain death person. Kidney
Which enzyme acts on pyruvate in mitochondria and converts it to acetyl CoA?Name its components and cofactors associated with it. Pyruvate dehydrogenase complex acts on pyruvate
Q. What is the concept of universality of the genetic code? What are the exceptions to this universality? The genetic code is universal because the rules of protein codificatio
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