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.
What are the complementary base-pairing rules for biology? In DNA, Adenine bonds with Thymine, Cytosine bonds with Guanine. In RNA, Thymine is changed with Uracil (bases capita
Q. Abolition of Arrhythmias by Exercise? The induction of arrhythmias by exercise is well recognized, but the abolition of ectopic activity is less commonly appreciated. The me
Is the interphase of meiosis different from the interphase of mitosis? The interphase that precedes meiosis is same to the interphase that precedes mitosis. In them the major e
Q. Explain Pulmonary Capillary Wedge Pressure? The PCW waveform is similar to LA pressure waveform except that it is damped and delayed due to transmission through the lungs. T
Q. Describe about Cardiomyopathy due to Persistent Tachycardia? In occasional cases, particularly in children recurrent or incessant episodes of supraventricular or ventricular
Define Dietary and Non Dietary Factors - Causation of Cancer? Several dietary and non-dietary factors (including genetics) can increase the risk in the causation of cancer. Som
Achondroplasia is an autosomal dominant disorder associated with a gene on chromosome 4. Sickle cell anemia is due to a gene on chromosome 11. A man and a woman with achondroplasia
Determine the importance of Educational History- assessment A complete school history includes information regarding a child's current grade placement, any grade repetitions o
Occurrence of Vitamin D Cholecalciferol is synthesized in the skin by the action of ultraviolet light on 7-dehydrocholesterol which is widely distributed in animal fat. Vitami
Dinitrophenol, DNP, was prescribed in low doses in the 1940's to help obese patients lose weight. It's use for this purpose was discontinued when several users died. DNP makes the
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