Photoperiodism, Biology

Assignment Help:

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.


Related Discussions:- Photoperiodism

Why is water conservation in c3 c4 and cam plants important, Why is water c...

Why is water conservation in c3 c4 and cam plants important? Cam stands for Crassulacean acid metabolism. C3 and C4 conserve less water than Cam plants. Actually, C4 plan

Explain jugular venous pressure and pulsation in details, Explain Jugular...

Explain Jugular venous pressure and pulsation in details? The jugular venous system is in direct continuity to right atrium in systolic extending to right ventricle in diast

Explain regulation of water balance for cells in the kidneys, Explain Regul...

Explain Regulation of Water Balance for Cells in the kidneys? Cells in the kidneys respond to low blood pressure by releasing an enzyme called renin, which in turn causes the k

Define classification of foods based on ph, Define Classification of foods ...

Define Classification of foods based on pH? Of these, the nature of the food, primarily the pH of food, is the most significant determinant of how severely the food will be pro

Explain about the pickling - methods of food processing, Explain about the ...

Explain about the Pickling - methods of food processing? Pickling was widely used to preserve meats, fruits and vegetables in the past, but today it is used almost exclusively

Sources of air pollution, Combustion of fossil fuels and wood in industries...

Combustion of fossil fuels and wood in industries, automobiles, aircrafts, railways, thermal plant kitchens etc., agricultural operations and industrial processing are major source

Determine the estimation of minerals in foods, Estimation of minerals in fo...

Estimation of minerals in foods The minerals in foods are determined by ashing or incineration at temperatures in the region of 500°C following standard procedure. This destroy

Massaging and tumbling techniques in meat products, M a s s a g i n ...

M a s s a g i n g and tumbling techniques To improve the desirable characteristics of meat products massaging and tumbling techniques were developed. Massaging involves

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd