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 do you understand by Flagella. A cellular hairlike locomotory structure which comprise an extension of the plasma membrane surrounding a 9+2 organization of microtubules.
(a) Give two examples of diseases which can be spread by contaminated drinking water. (b) How can the spread of such diseases be prevented? (a) Typhoid and cho
A recently married man and woman discover that each had an uncle with alkaptonuria, otherwise known as "black urine disease," a rare disease caused by an auto somal recessive allel
Structure of Blastula The structure of blastula turns into modified in several animal groups. The changes are related to the amount of yolk deposited in the egg, as you will s
This problem refers to the MN and ABO loci mentioned in class. It also refers to the Rh locus, which is responsible for the positive/negative part of the blood type. The Rh+ allele
Q. Can you explain Yersinia Enterocolitica Gastroenteritis? Yersiniosis is an infectious disease caused by a bacterium of the genus Yersinia. Most human illness is caus
What are the uses of formycin B? Formycin B is a drug used to demolish of intestinal parasites.
CONJUNCTI V A - Ectodermal in origin. Formed by epidermis. It is thin, transparent covers cornea. Made up of stratified epithelium. It has 2 parts - (i) Ocular conjunct
To study whether bacteria grow best where it is moist or dry Use 2 sterile dishes. Inoculate each one by touching a sterile transmit needle to a bacteria colony rowing in anoth
Define Health and Feeding Problems among Elderly? Malnutrition, both obesity and under nutrition, are common problems linked with elderly. Some of the common disorders such as
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