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

Why is it advantageous to have weak hydrogen bonds, Why is it advantageous ...

Why is it advantageous to have weak hydrogen bonds among complementary bases and strong covalent bonds among phosphate and Deoxyribose groups in a DNA molecule? The hydrogen bo

How will this increase survival, Why would we evolve so that when we are st...

Why would we evolve so that when we are stressed our immune system is suppressed? How would this increase survival?

Soil pollution, Soil is upper crust of earth which support land plants and ...

Soil is upper crust of earth which support land plants and animals. It is defined as addition of substances to the soil, which adversely affect physical, chemical? And biologica

What is gum ghatti, What is Gum ghatti Gum ghatti, also known as Indian...

What is Gum ghatti Gum ghatti, also known as Indian gum, is amorphous, translucent exudates of the Anogeissus latifolia tree of the Combretaceae  family. Gum Ghatti is composed

Cell culture products, Cell culture products: Animal cell cultures ar...

Cell culture products: Animal cell cultures are used to generate virus vaccines, as well as different kind  of useful biochemical which are mainly high molecular weight prote

Define the prevention of iron deficiency anaemia, Define the Prevention of ...

Define the Prevention of iron deficiency anaemia? As in the case of vitamin A deficiency, correction and prevention of dietary inadequacy of iron are important sustainable meth

What are the indications of implant removal, What are the indications of im...

What are the indications of implant removal? Failed implants need to be removed and the specific indications include: - Severe Perimplant bone loss (> 50 per cent implant le

What is the role of the ozone layer for living beings, What is the role of ...

What is the role of the ozone layer for living beings? Ozone, O3, is a gas of the atmosphere that filters ultraviolet radiation from the sun disallowing most of that radiation

Culturing, ime day 0 day 1 day 3 day 4 day 5 day 7 count ...

ime day 0 day 1 day 3 day 4 day 5 day 7 count blank 7 10 5 14 9 8 low 45&49 64&70 62&69 75&79 80&82 68&72

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