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

Types of leaves, Types of leaves Collect leaves from such plants as lil...

Types of leaves Collect leaves from such plants as lilies, bamboo, corn, willow and geraniums. View that the monocots (lily, bamboo, corn, sugar cane) have the veins running pa

Determine the term -stolon, Determine the term -Stolon. In a number of ...

Determine the term -Stolon. In a number of colonial cnidarians, ascidians, and lophophorans, a cord of tissue connects different zooids of colony to each other. Buds on stolon

Methods of evaluation, METHODS OF EVALUATION: The two main areas of ev...

METHODS OF EVALUATION: The two main areas of evaluation include a) evaluation of  job performance of individual b) evaluation  of programme  agency  1)  Evaluation of  the

Diagram, #questioi want clarius diagramn..

#questioi want clarius diagramn..

Osmotic and ionic regulation, Osmotic and Ionic Regulation The  ammono...

Osmotic and Ionic Regulation The  ammonotelism, ureotelism and uricotelism are the adaptations of the animals for the removal of toxic nitrogenous wastes and thereby maintain

Zoology, what are the physical requirements to become a zoologist?

what are the physical requirements to become a zoologist?

What are the uses of wpc, What are the uses of WPC?  Whey protein conce...

What are the uses of WPC?  Whey protein concentrates are used extensively in the manufacture of baked goods, where they enhance the effectiveness of shortening through better d

Define limitations for underwater weighing method, Define Limitations for u...

Define Limitations for underwater weighing method? This method is expensive, time consuming and usually requires a lot of equipment and space. The subject needs to be

Respiration in cockroach, what is the chemical reaction of respiration in c...

what is the chemical reaction of respiration in cockroach?

How two organisms are interdependent, Give an example of how two organisms ...

Give an example of how two organisms are interdependent. Animals generate carbon dioxide and water, which is required by plants. Accept all reasonable answers.

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