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.
Sickle cell anaemia in man is caused by a defective chain of haemoglobin. The abnormal haemoglobin known as MbS differs from natural haemoglobin (HhA) in one amino acid. A substitu
What is Deuterostome. Explain in brief. Phyla, including the Chordata and Echinodermata which share common characteristics of blastopore-not forming the mouth, radial indetermi
Why is it important for chromosomes to be condensed during mitosis and decondensed during interphase? During mitosis the major problem to be solved is the correct separation of
Q. Carbohydrate distribution in insulin? The carbohydrate distribution varies with the type of insulin prescribed. For example, in case of regular insulin 1/3rd each carbohydra
what is the tolerance range of man
Measuring ecosystem diversity is not easy, and ther e is no definite index for its measurement. It is generally assessed by the measure of species diversity in an ecosystem, often
discuss the importance of protozoa to humans
Do moulds grow better where it is warm or cold? This time put single culture dish in a warm dark place and the other in a cold dark place. Study the dishes after a some days.
MUTATION THEORY (Hugo de Vries 1901) - New species are not formed by continuous variations but sudden appearance of variations i.e., mutation. Mutation are heritable and per
These are found in about 3-6 per cent of cases of ARF. These nodules are typically subcutaneous, firm, painless, freely movable (0.5-2 cm size) and their presence indicates that t
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