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.
Question 1 Discuss the Following a) Immune response b) Immunofluorescence test and its applications Question 2 Answer the following ques
Asteroid impacts: The hypothesis which links certain mass extinction events with the impact of the comet or asteroid, most particularly the mass extinction 65 million years which
Q. Explain the Physiologic mechanism of osseointegration It has been suggested that the physiologic mechanism for maintaining osseous integration is a sustained evolution in re
D i s e a s e s of Cardiovascular and Haemopoietic System Cardiovascular system maintains circulation of blood for normal exchange of fluid, electrolytes, oxygen and nut
The first step of the purification of an integral membrane protein is to disrupt its interactions with other integral proteins and the lipids in the membrane. This is commonly ach
Dietary fibre Dietary fibre: Typhoid patient has an inflamed intestinal mucosa, which can be easily perforated and ulcerated leading to internal haemorrhage. Thus foods hig
Explain the drawback of protein hydrolysates The drawback of many protein hydrolysates, is that when hydrolysed, most of the food proteins liberate bitter tasting peptides, wh
Explain the Appearance of the Pupil The pupil should appear round and regular. The normal diameter is 2-4 mm. On stimulation by light, the pupil constricts, so as to redu
Assuming that variability of populations were non-genetic, that is, not controlled by genetic material, once again chance events alone would determine which of the organisms would
Cyclosporine Immunosuppressive agent that is selective for lymphocytes mainly "T" lymphocytes. Route: Oral, parental, dose as prescribed. Side-effects: Ne
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