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!
Incompatibility - Pollination and Fertilization
Plants growing under natural conditions have a preference for their mating partners. The stigma of the female parent receives all kinds of pollen. However, the choice of pollen of the desired parent that would accomplish fertilization is finally determined by both, pistil and the pollen. This gametophyte (pollen) and sporophyte (pistil) interaction leads to recognition (acceptance or rejection) of mating partners. In angiosperms, the female gamete is located in the ovule present in the ovary.
Therefore, pollen grains carry male gametes through pollen tubes that travel from stigma to ovary to affect fertilization. The pollen tube has to traverse through the tissues of the stigma and style. A situation in which fertile pollen fails to accomplish fertilization process so that a viable embryo seed is not formed is sexual incompatibility. Self-incompatibility means the inability of the plant producing functional gametes to set seed upon self-pollination. It may operate between the individuals of the same species-intra specific or self-incompatibility or of different species-inter specific incompatibility.
MODIFICATION OF MITOSIS 1 . CRYPTOMITOSIS OR PROMITOSIS : Primitive type of mitosis. In this mitosis nuclear membrane not disappear (remain intact throughout the div
Explain about the Niacin (nicotinic acid) deficiency? Niacin (nicotinic acid) deficiency classically results in pellagva, which is a chronic wasting disease associated with a c
What is transgenic food? Transgenic beings are animals, microorganisms and plants that have recombinant DNA, i.e., genes from other plants, microorganisms or animals artificial
Secondary Induction The two primary inductive events that we have described so far are significant in the patterning of early embryo. But there are another such signaling eve
Explain the neuritic type of infantile beriberi? It is also referred to as Wernicke korsakoff syndrome or cerebral beriberi. It shows typical manifestations of peripheral neuro
Ask question #M1. Discuss why Obelia is considered to be of special interest in Zoology as an animal showing an intermediate grade of organization. inimum 100 words accepted#
Occurrence of Vitamin D Cholecalciferol is synthesized in the skin by the action of ultraviolet light on 7-dehydrocholesterol which is widely distributed in animal fat. Vitami
Based on the simplified two-gene model for eye colour, explain using genotypes how two blue-eyed parents could produce a brown-eyed child. In what ways is genomic imprinting sim
MCNAUGHTON'S CASE AND LAW: In 1843, McNaughton shot and killed Sir Robert Peel's secretary Edward -Drymmond. It was shown that McNaughton suffered from a number of delusi
What is visual accommodation? Visual accommodation is the phenomenon of varying the curvature of the crystalline lens to make possible the variation of its refractivity to adju
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