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.
Minerals : Bromine Food Source Brominated flour Nutritional Functional role Not known to be essential to humans. Dough improver: KBrO 3 impr
how trematodes/nematodes adapt to their parasitic mode of feeding
Q. What are the respective functions of phospholipids, carbohydrates and proteins of the cell membrane? Membrane phospholipids have a structural function they form the bilipid
SE X DIFFERENTIATION MECHANISM - Primitive gonads are identical in both sexes upto 6 weeks of gestation pressure. This gonad is known as bipotential primordial gonad. It
The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy? 1. Fourth month 2. Fifth month 3. Sixth month
Erythema migrans Oral antibiotic therapy shortens the duration of the rash and generally prevents development of late sequelae. Among the 3 drugs used for this indication, onl
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4 Determine the Yersin
What is the hydrogen ion concentration of stomach acid pH=1.6?
Q. Can you explain Lane and Eynon method? Reducing sugars are those, which have free sugar groups (e.g. glucose, fructose etc.) and hence may be estimated directly by titrat
Vitamin- D deficiency Animals obtain vitamin D either through the diet or when skin is exposed to solar radiation. The deficiency of vitamin D is associated with reduced absor
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