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

Define the effect of niacin deficiency on skin, Define the effect of niacin...

Define the effect of niacin deficiency on Skin? Dermatitis is the characteristic feature of the' disease, It is symmetrical in distribution. In early stages, a bright red eryt

Fibroblast, Fibroblast  is the term applied to a cell of connective tissue ...

Fibroblast  is the term applied to a cell of connective tissue which is separated from similar cells by some degree of the matrix material; fibroblasts secrete elastin and collagen

Determine the parathryroid hormone receptors, Which of the following serves...

Which of the following serves as an effector, or part of an effector, that functions in a negative feedback system? A. 1,25-dihydroxyvitamin D Receptors located intracellularly

What is the pigment responsible for this perception, What are the plant org...

What are the plant organs responsible for the perception of light variation? What is the pigment responsible for this perception? Leaves are mostly responsible for perception o

Minerals requirements for dyslipidemia, Q. Minerals requirements for dyslip...

Q. Minerals requirements for dyslipidemia? Minerals: The three most important minerals are chromium, zinc and magnesium. These minerals play a critical role in maintaining p

Father, who is the father of science

who is the father of science

Normal color vision- color blindness, If a color blind man marries a woman ...

If a color blind man marries a woman pure for normal color vision, it's probable that one of the below situations may result. Is it possible that a) All the children would be

How bone density affect osseointegration, Q. How Bone density affect osseoi...

Q. How Bone density affect osseointegration? The most important bone property is density which is influenced by factors such as patient age and genetics. Higher density bones h

Can you explain para-sternal view, Q. Can you explain Para-sternal View? ...

Q. Can you explain Para-sternal View? Various congenital anamolies can be detected in this view are perimembranous VSD (transducer anbled towards right hip), doubly commit

Describe methanogen archaebacteria and thermoacidophile, Q What are halophi...

Q What are halophile, methanogen archaebacteria and thermoacidophile? There are three peculiar types of archaebacteria the halophile archaebacteria only survive in salt-rich en

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