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Photoperiodism
Activity like breeding and migration in animals; flowering, seed germination in plants are regulated by the length of daily period of light and darkness. This behavioural phenomenon is known as photoperiodism. For example, plants such as radish, potatoes and spinach bloom when the light duration is more than 12 hours/day. Such plants are called long day plants. Cereal, tobacco, dahelia and many other plants bloom when light duration is less than 12 hrs/day. These are called short day plants. Such responses show that plants have built-in mechanisms for measuring the duration of illumination and darkness and hence flower in a specific seasons.
Similar photoperiodic responses are observed in animals. These may be diurnal, lunar or annual. Reproduction and migration in birds are such annual photoperiodic responses. From such responses it seems that distribution of some plants and animals may be restricted because the necessary photoperiodic stimulus is available only at certain latitudes.
SIGNIFICANC E OF GASTRULATION - It results in the formation of three germ layers. It also resutls in the formation of different organs & organ systems. Gastrulation is e
Typical Form or Reparative Regeneration - Heteromorphosis Sometimes the part which grows back is not the same as that which was lost. The phenomenon is called Heteromorphosis.
Ratios of the bases in different samples of nucleic acid yielded the following results: a. A + C = 0.6 b. A + C = 1 c. A + G = 1.2
Habits of patients- Implants Smoking has been shown to predispose to poor bone quality by reduced vascularity. Therefore it is prudent not to accept heavy smokers as implant pa
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An incubation combination is set up having the single-stranded DNA template, DNA polymerase I, the primer and all 4 deoxyribonucleoside triphosphates (dTTP, dGTP, dCTP, dATP),
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Q. Living beings are made of inorganic and organic substances. According to the molecular complexity how can each of those substances be classified? Inorganic substances, mole
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