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 the process of nuclear reorganization, Process of nuclear reorganiz...

Process of nuclear reorganization in protozoa in which nucleus divides, each half undergoes a maturation, and two persisting functional nuclei reunite is termed as: a) Autogamy

What are the three main parts of a eukaryotic cell, What are the three main...

What are the three main parts of a eukaryotic cell? The eukaryotic cell can be divided into two major portions: the cell membrane that divides the intracellular space from the

Describe the technique of food processing, Technique of food processing ...

Technique of food processing Freezing is another ancient technique of food processing, which allows the transportation of perishable food items for long distances from producti

Disease occurrence due to climate change in animals, Disease occurrence due...

Disease occurrence due to climate change The movement of animal diseases across physical and political boundaries threatens food security and creates a global public co

Define meal pattern and feeding considerations, Define Meal Pattern and Fee...

Define Meal Pattern and Feeding Considerations? The meal pattern and the feeding considerations include the following: - Meal timings play an important role in ensuring adeq

Describe the significance of micronucleus., Describe the significance of mi...

Describe the significance of micronucleus. One of two types of dimorphic nuclei found in ciliate protozoans. The single micronucleus contains only one copy of the genome and is

Intravenous drug abusers, The risk for IE among IV drug abusers, 2 to 5 per...

The risk for IE among IV drug abusers, 2 to 5 per cent per patient- year, is estimated to be several fold greater than that of patients with rheumatic heart disease or prosthetic v

What is a distilling flask and how is it used, What is a distilling flask a...

What is a distilling flask and how is it used? A distilling flask is a round bottom flask that often has two openings, and some of them have a long neck.

Determine the stabilized forms of natural colourants, Stabilized forms of n...

Stabilized forms of natural colourants The mimicking of the native environment in which a natural colour exists is just one way of producing a stabilized form. In this case, th

Explain amylopectin, Amylopectin Amylopectin forms a branched structure...

Amylopectin Amylopectin forms a branched structure with about 30 glucose units in a chain among branches. There are usually slightly more  'outer' unbranched chains (called A-c

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