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.
The bases in DNA have carbon-nitrogen ring structures; due to the nitrogen atoms they are known as nitrogenous bases. There are two parts of ring structure. Adenine and guanine are
keel is the characteristic feature of flower of 1.tomato 2. tulip 3.ubdugifera 4.aloe
Question 1 Describe in detail the immunoprophylaxis Question 2 Give a detailed account on autoimmune diseases Question 3 Describe the classification and properties of an
Assume that your yard has many tall trees that result in about fifty percent of the yard being shaded and fifty percent of the yard being exposed to full sun. The shaded areas and
Conclusions drawn from the Monohybrid Crosses From the results of his monohybrid crosses, following conclusions were obtained :- 1 . Law of Unit or Paired Factors (Po
#question. what is cloning.
Prepared Assignments on glycolysis
Variety of Locomotion A number of animals are sendentary, remaining attached to some substratum. These animals may move parts of their body but this does not result in the mov
Determine the Food Sources of Iodine? Please note that unlike other minerals studied so far, like selenium, the iodine concentration in foods is highly variable and also depend
P a r a s i t i c Diseases F a s cioliasis It is a liverfluke infestation characterized by hepatic insufficiency, bile duct obstruction, and poor production per
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd