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

Lymphatic obstruction leading to heart failure?, A 62 year old white male d...

A 62 year old white male develops pitting edema of both feet. Put on Lasix and metoprolol. Develops hallucinations and confusion. Tapered off. Dies 3 weeks later of lymphatic o

Explain the properties of hydrolysed soy proteins, Explain the Properties o...

Explain the Properties of hydrolysed soy proteins Partially hydrolysed soy proteins possess good foam stabilization properties and can be used as whipping agents in combination

Explain about the microcolony deft, Explain about the Microcolony DEFT? ...

Explain about the Microcolony DEFT? It allows determination of viable cells. Food homogenate is filtered through a DEFT membrane and then placed on the surface of appropriate c

What event marks the beginning of the menstrual cycle, What event marks the...

What event marks the beginning of the menstrual cycle? What is the blood concentration of FSH, LH, estrogen and progesterone in this phase of the cycle? By convention the menst

Source of cells for regeneration, Source of Cells for Regeneration It...

Source of Cells for Regeneration It had been considered earlier that interstitial cells constitute a reserve of undifferentiated cells that provide the cellular material for

How the brain influences or controls immune system, How the brain influence...

How the brain influences or controls immune system Scientists are still working to determine to what degree, and how, the brain influences or controls immune system functions,

Cell division., sir i''m not understanding cell division rightly. in ca...

sir i''m not understanding cell division rightly. in case of meiosis both paternal and maternal chromosome goes in two cell separately while in case of mitosis they go alongwit

Describe st segment depression, Q. Describe ST Segment Depression? The ...

Q. Describe ST Segment Depression? The development of ST-segment depression with exercise is probably the most reliable sign if myocardial ischaemia and appears to be the most

Nursing management of myocarditis, Nursing Management Propped up po...

Nursing Management Propped up position.  Monitor signs and symptoms and laboratory test results documenting myocarditis.  Monitor adequacy of cardiac output and hemo

Qualities of a good counsellor, It is important to know about qualities of ...

It is important to know about qualities of a counsellor because you will be counselling a diabetic patient and his family members in clinic/home/hospital and therefore, you shoul

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