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

The codon gca specifies which amino acid, Use the genetic code table Assign...

Use the genetic code table Assignment34 The codon GCA specifies which amino acid?

Define the term underweight, Define the term Underweight? Just as overw...

Define the term Underweight? Just as overweight is the result of a positive energy balance irrespective of the etiology, underweight results when the energy balance is negative

Lymph, Why lymph is also called middle man of body

Why lymph is also called middle man of body

Define precautions for acid fast staining, Define Precautions for Acid Fast...

Define Precautions for Acid Fast Staining? 1. Do not allow carbol fuchsin to dry on heating. 2. Maintain aseptic conditions. 3. Decolourization should be done till no red

Drawbacks of lamellar model, Drawbacks of Lamellar model This model ...

Drawbacks of Lamellar model This model does not explain the elasticity of PM. Although this model says that PM is elastic but it also states that head of lipid molecules is

Nucleic acid amplification, Ask Prepare a 2-4 page summary of nucleic aci...

Ask Prepare a 2-4 page summary of nucleic acid amplification techniques that are being explored in the development of nucleic assays for clinical use. Research and identify a mo

What are anticoagulants, Q. What are anticoagulants? What are the practical...

Q. What are anticoagulants? What are the practical applications of anticoagulants, like heparin, in Medicine? Ordinarily there are anticoagulants circulating in the plasma sinc

Objective of the law of contract, The law of contract is that the branch of...

The law of contract is that the branch of law which determines the circumstances in which promises made by the parities to a contract shall be legally binding on them. Its rules de

Types of ecosystem, Ecosystems are so varied in form and structure that wha...

Ecosystems are so varied in form and structure that whatever has a distinct community of its own, can be called an ecosystem eg. A crop field, grass land, barks etc. all the ecosys

Explain the plaque assessment, Plaque Assessment Microbial films have b...

Plaque Assessment Microbial films have been known to form on inert biomaterial surfaces in an aqueous environment. Implants placed in the oral cavity are no exception and repre

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