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.
Functionality of cellulose Cellulose has many uses as an anticaking agent, emulsifier, stabilizer, dispersing agent, thickener and gelling agent, but these are generally subsid
cutaneous respiration
Osmotic pressure is the pressure formed in a aqueous solution by a region of lower solute concentration upon a region of superior solute concentration forcing the passage of water
a soil surface of 10cm2 may contain what type of hyphae?
Q. What are sarcomeres? Sarcomeres are the contractile units of the muscle tissue formed of alternating myosin blocks (thick filaments) and actin blocks (thin filaments). Sever
Explain Congenital Heart Disease (CHD)? Congenital heart disease is an abnormality at birth in cardiac circulatory structure or function. Optimal management of CHD aims not mer
Q. What is the function of the flagellum of the sperm cell? How is it formed? The flagellum of the sperm cell is made by the centrioles that migrate to the region posterior to
Ecological isolation is based on the fact that population shows preference to one habitat over the other. This extensive forests become barriers to the dispersal of organims living
do you think the social and cultural environment of the 18th and 19th centuries helped or hindered the study of microbiology in particular and science in general
Define The Names of Some Immemorial Plants? From the time immemorial plants have been known by some name, they are common, vernacular or local names given by different persons.
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