Barriers to fertilisation, Biology

Assignment Help:

Barriers to Fertilisation

Incompatibility can occur anywhere from pollination to syngamy and consequently obstructing fertilisation. The pollen fails to germinate or the pollen tube is inhibited to penetrate the stigma.

The progamic barriers to fertilisation may be on the stigma or in the style at any level from pollen germination to the discharge of male gamete in the vicinity of egg.

On the other hand, syngamy barriers include the inhibition of the entry of pollen tube to the ovary, ovule or within embryo sac. At the stage of pollination the barriers to fertilisation are of morphological and ecological types, whereas, at progamic phase and syngamy physiological barriers occur.


Related Discussions:- Barriers to fertilisation

Illustrate about the complex partial seizures, State about the Complex part...

State about the Complex partial seizures Complex partial seizures, another type of focal seizure, originate most commonly in the temporal lobe. Complex partial seizures are cha

Give an example of structural protein, Give an example of each of the follo...

Give an example of each of the following types of proteins: a. Enzyme b. Structural protein c. Motor protein

Where are the adrenal glands located, Where are the adrenal glands located?...

Where are the adrenal glands located? How many are they and what are their portions? Each adrenal gland is located on the top of every kidney (forming a hat-like structure for

Explain nutritive and non-nutritive sweeteners, Q. Explain Nutritive and No...

Q. Explain Nutritive and Non-Nutritive Sweeteners? Nutritive Sweeteners: We know some sweeteners like glucose, honey, molasses, fruit juice, dextrose, maltose, mannitol, sorbit

What is the vector of malaria, Q. What is the vector of malaria? How differ...

Q. What is the vector of malaria? How different is its behavior from the behavior of the vector of dengue fever? The vector of malaria is the mosquito of the genus Anopheles, a

Define epithelial tissue, Epithelial tissue the cells in animals which are...

Epithelial tissue the cells in animals which are closely packed in either single or multiple layers, and which cover internal and external surfaces both of the animal body. It is

Explain alternate photosynthetic pathways, Explain Alternate Photosynthetic...

Explain Alternate Photosynthetic Pathways? An alternate photosynthetic pathway is the C4 pathway, where plants incorporate carbon into four-carbon compounds instead of 3PG. Thi

Explain solubility and physical properties of proteins, Solubility and phys...

Solubility and physical properties of protiens Simple proteins Conjugated proteins Derived proteins

Coagulation - blood collection , Coagulation - Blood Collection : Plasm...

Coagulation - Blood Collection : Plasma is used to minimize the time needed for coagulation so it is used is medical emergencies. There are many types of anticoagulants used

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd