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.
What do you understand by Flagella. A cellular hairlike locomotory structure which comprise an extension of the plasma membrane surrounding a 9+2 organization of microtubules.
Q. What is the commercial importance of algae? Numerous algae have high nutritional value and are commercialized and consumed as human food they are very popular food in the or
????? # 100 ??????????? #Minimum ?????? ?????
Question 1 List the differential staining techniques used in microbiology laboratory. Explain Gram staining technique in detail. Add a note on modifications of Gram staining and a
Describe about the Tertiary Prevention - food allergy? The tertiary allergy prevention, as you already know, focus on patients with symptoms. Hence, the strategies will target
Nine-year-old Alek is admitted to the emergency room with a closed fracture of the right femur. Radiography revels that the fracture crosses the distal epiphyseal plate. What conce
Q. Classification of plants and animals? The first and foremost step in the classification of plants and animals is the. grouping together of individual organisms on the basis
Ask question #Minimuwhat are the similarities between pisces and amphibians
Q. Goals of Dietary Treatment for dyslipidemia? The goals of dietary management (alone or conjunction with exercise or with lipid lowering drugs) are to reduce the total fat, s
Rainfall is high, sometimes higher than tropical rain forests but seasonal. There are pronounced wet and dry periods, and so are winter and summer seasons. The soils are brown in c
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