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

Changes in chromosome number, Aneuploidy : One or inore chron~osomes of a n...

Aneuploidy : One or inore chron~osomes of a normal set nlay bc lacking or present in excess. The term riullison~y refers to absence of both the chromosomes of a pair. Monosomy, tri

Explain resistance to isoniazid, Resistance to Isoniazid  The most comm...

Resistance to Isoniazid  The most common pattern of resistance is isolated resistance to isoniazid, which can be treated with rifampin, pyrazinamide and ethambutol for 6-9 mont

Define about the mid-day meal programme, Define about the Mid-day Meal Prog...

Define about the Mid-day Meal Programme? The National Programme of Nutritional Support to Primary Education commonly known as the Mid Day Meal (MDM) Scheme (was launched in Aug

Are there differences between the male and female skeletons, Q. Are there d...

Q. Are there differences between the male and female skeletons? Many general differences exist between female and male skeletons. Male skeleton is normally larger and heavier t

The cerebrum, The cerebrum is clearly the most interesting part of the brai...

The cerebrum is clearly the most interesting part of the brain from the point of view of cognitive neuroscience. The cerebrum consists of highly symmetrical left and right hemisphe

#titlemicrobiology.., topics relating research on microorganisms and their ...

topics relating research on microorganisms and their application ?

Bovine ephemeral fever, Bovine ephemeral fever Ephemeral fever is commonly...

Bovine ephemeral fever Ephemeral fever is commonly known as 'three-day sickness'. It affects mainly cattle and occasionally sheep in India. Causative agent is a mosquito-borne vir

Explain concept of normal diet, Normal or General Diet This diet is pl...

Normal or General Diet This diet is planned to be  consistent with the  Recommended Dietary Allowances (RDAs) of  nutrients  and  is based  on  the food groups.  It  is  usuall

Explain the regulation of blood glucose concentration, Explain the Regulati...

Explain the Regulation of Blood Glucose Concentration? A number of mechanisms function to maintain blood glucose at remarkably constant level of 70-100 mg/dl under fasting cond

Heart output, HEAR T OUTPUT The amount of blood pumped by heart per...

HEAR T OUTPUT The amount of blood pumped by heart per minute. Heart beat is 72. Pump out blood is 70 ml. This 72 × 70 = 5040 ml. ( 5 litres) blood is pumped in a minute.

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