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

Explain xylose isomeras, Explain xylose isomeras A mixture of glucose ...

Explain xylose isomeras A mixture of glucose and fructose, is produced from sucrose by the action of yeast invertase (β-fructofuranosidase), an enzyme which can only be extrac

Deficiency diseases, DEFICIENCY DISEASES Animals may suffer from diseases...

DEFICIENCY DISEASES Animals may suffer from diseases caused by deficiencies of energy and proteins, mineral nutrients and vitamins, which generally occur either due to deficiency

Explain thetechnique of total anomalous surgery, Explain theTechnique of to...

Explain theTechnique of total anomalous Surgery ? Corrective surgery is undertaken as an emergency procedure after diagnosis has been confirmed by two-dimensional echocardiogra

Reproduction, What is the difference between asexual and sexual reproductio...

What is the difference between asexual and sexual reproduction

Echinoderms, What is the classification scheme for echinoderms?

What is the classification scheme for echinoderms?

Explain about phytopinax written by caspar bauhin, Explain about Phytopinax...

Explain about Phytopinax written by Caspar Bauhin? A significant contribution to taxonomy was made at this time by Caspar Bauhin. His 'Phytopinax' (1596) described 2700 species

What is diatoms, What is Diatoms? Bacillariophyta are commonly known as ...

What is Diatoms? Bacillariophyta are commonly known as diatoms because of their unique structure. These unicellular photosynthetic organisms are composed of two overlapping glas

Explain identification of cancer cells from normal cells, Explain Identific...

Explain Identification of Cancer Cells from Normal Cells? Cancer cells can be distinguished from normal cells by examining them under a microscope. In a specific tissue cancer

What is probing depth, What is Probing depth Probing depths can be infl...

What is Probing depth Probing depths can be influenced by the tissue type- shallow depths are associated with a keratinized collar, whereas deeper depths are associated with mo

Why is drosophila a convenient animal study of linked genes, Why is drosoph...

Why is drosophila a convenient animal for the study of linked genes? The fruit fly drosophila is appropriate for the study of Genetics because it presents many distinct traits

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