Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
If an enzyme-controlled reaction normally takes place at 10ºC, in general terms how will the reaction be affected by (a) a fall in temperature to 2°C , (b) a rise in temperature t
S e l e n i u m Selenium toxicity due to pollution of environment has been reported in animals. Contamination of pasture from industries emitting fly ash particularly fo
How the Oxidation-reduction potential influence the spoilage of meat? You learnt earlier that the presence or absence of oxygen and the 0-R potential of the food itself has a b
Define How to Prevent the Cancer? A continuing and urgent need is there to take all steps to prevent cancer. Cancer rates are set to increase another 50 percent by the year 202
Which of the following statements concerning enzymes is false? a. They function as catalysts b. The active site of an enzyme has a shape that is specific for its c. Many e
Will the plant-incorporated protectants rules affect the Bt reassessment? No. To make sure that our biotechnology assessments reflect the latest data on health and ecological e
What is Demographic Transition? The whole process of change with regard to population size and characteristics is called demographic transition. In order to understand this ter
Explain Canal Obstruction - Non-surgical Endodontic Retreatment File work shorter than the normal apical and feel a great resistance to reach the true length a. A retain
What are Herbicide tolerant crops in ecological Herbicide tolerant crops (HTC) Ecological a) Increased use of the herbicides that plant is tolerant to (describes ecologi
Define Dietary Management of Sepsis with or without MODS? Before we begin with the dietary management of patients suffering from sepsis with or without MODS let us read a case
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd