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.
Process of Regeneration in Planarians Regeneration in planarians has been broadly studied and considerable information regarding this phenomenon is now available. Let us see w
Q. Reduction in left ventricular? Vasodilators improve stroke volume, and reduce degree of regurgitation. This results from decrease in systemic vascular resistance and leads t
a) The West of Scotland Coronary Prevention Study (WOSCOPS): The study randomized healthy men between the ages of 45 and 64 years with TC levels higher that 252 mg/dL and LDL chole
Boiling Point There are certain properties of solutions which are directly connected with vapour pressure and one of it is boiling point. You must have observed that water bo
Q. Explain the use of Benzoates acid? Benzoic acid, sodium benzoate and the parahydroxy esters (parabens) are used as preservatives. Benzoic acid and its sodium salt, sodium be
URETERS From hilum of each kidney emerges out a tube. Wall is thick. Lumen is star shaped. 28 cm. long. Transitional epithelium present in wall. Open in to urinary bla
Explain about the Dietary Calcium Requirements? There are variations in the amount of calcium recommended by different advisory groups. This is mainly due to the different crit
Determination of Nicotinic acid The chemical methods of assay are based on colour reactions of pyridine. Nicotinic acid and nicotinamide are converted by cyanogen bromide into
Define the term- brain circuitry underlying addiction By unraveling brain circuitry underlying addiction, scientists have identified new targets for therapies which might quell
what is the purpose of pyramaids in biology
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