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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.
Isomerases These enzymes (code EC 5) catalyze geometric or structural changes within a molecule. According to the type of isomerism, they may be called racemases
(a) What effect does alcohol have on reaction time? (b) What other short-term effects does alcohol have? (c) What long-term effects can result from an exce
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What is Waist-to-Hip Ratio? Waist-to-Hip Ratio (WHR) is defined as the measurement of waist circumference divided by hip circumference. For example, if a person's waist measure
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Why is carbon monoxide toxic for humans? Hemoglobin "likes" carbon monoxide (CO) much more than it likes oxygen. When there is carbon monoxide in the inhaled air it binds to he
Local Needs, Choices and Circumstances Beyond obvious choice for private sector, the best public-private balance for a country depends on its local culture and circumstances.
Q. What is the chorioallantois membrane present in the embryonic development of birds and reptiles? How does this membrane participate in the energetic metabolism of the embryo?
Explain exotic species? Describe with the help of two examples how the exotic species disturb the native species of an ecosystem ?
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