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!
Sterility in Angiosperms
Sterility in angiosperms may arise due to several causes. Either the anther may not be formed, or anthers are formed but meiosis may be abnormal.
A. In situations where anthers are not formed, they may take abortive forms and appear like petals or sepals. These conditions are referred to as petaloid and phyllody respectively. There are even cases where anther formation may be suppressed altogether. These cases of pollen sterility have premeiotic determination.
B. There are other examples in which anthers are produced but meiosis is abnormal resulting in the formation of non-viable pollen.
C. Sometimes normal pollen grains are formed but they are not released. This results from failure of anther dehiscence. Such a situation is also described by the term contabiscent anther.
D. Sometimes meiosis is normal but abortion can take place due to premature dissolution of callose. This can occur at any stage during microsporogenesis.
Fungi are a very diverse group of organisms and have a significant impact on the production, spoilage and safety of food. Molds have not only served to synthesize antibiotics but a
I nclusion body hepatitis (IBH) A disease of chickens characterized by acute mortality, often with severe anemia, is caused by an adenovirus. A number of different serotypes h
Tuberculosis Tuberculosis (TB) is an ancient disease of man, animals and birds. It is an infectious disease, characterized by slow development of tubercles in almost any organ
Explain Protein hydrolysates It is valued for their superior nutritional qualities, including increased bioavailability and reduced antigenecity. Several enzymatic modification
Define the Over nutrition obesity of Infant? An infant is never put on a reducing diet. The chances of obesity are least if an infant is exclusively breast-fed till 6 months. I
What is the nucleolus? The nucleolus is a small and optically dense region in the interior of the cell nucleus. It is made of ribosomic RNA (rRNA) and proteins. Single nucleus
Explain why Meat products causes diabetics Diabetics can have meat products in case they eat non-vegetarian food. Baking, roasting or grilling is preferable to frying. Patient
Define Physical activity as a factor for obesity? Sedentary life style with lack of an exercise schedule tends to make one obese. As we approach middle age, our physical activi
What is Chromosomes ? The terminology used to describe DNA replication may sometimes be confusing. Originally, the term "chromosome" referred to the structures seen through the
When the chromosomes are depleted of histones they are seem to have a central fibrous 'protein scaffold' or nuclear matrix to which the DNA is attached in loops. Therefo
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