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!
Mating and Fertilisation
In all animals sperms are motile and have to move and seek the eggs to fertilise them. For this an aqueous environment is necessary. This need of a liquid medium has led to two basic mating patterns.
1. External fertilisation - mating partners come in close proximity in water and concurrently shed their eggs and sperms in water.
2 Internal fertilisation - mating partners come into physical contact and copulate, in which the male transfers the sperms directly into the reproductive ducts of the female. The ova coming down the ducts obtain fertilized. Internal fertilisation is characteristic of terrestrial animals, but as well occurs in several aquatic forms. Internal fertilisation usually leads to development of an intromittent organ or penis in the male partner. A range of such copulatory organs are found in non-chordates, such as like dates there are spermathecae for storing sperms received during mating. As the eggs pass down the ducts sperms are released from the spermathaca to feitilise them. Honey bee queen mates just one time when it receives enough sperms to fertilise the many thousands of eggs she is going to lay in 4-5 years of reproductive life.
Cells are classified into eukaryotic or prokaryotic. Prokaryotic cell is that with no a delimited nucleus. Eukaryotic cells are those with nucleus delimited by membrane.
What is the main evolutionary innovation presented by nematodes? What is the advantage of that innovation? The short evolutionary innovation of nematodes is the complete digest
Rice milling Rice milling involves the following processing steps: rough rice (paddy rice) → hull removal → brown rice → polishing to remove the bran coats (fruits and seed
Ask question #Minimum 100 words adccepted#
Hipot is an abbreviation for high potential. Usually, Hipot is a term given to a class of electrical safety testing instruments used to confirm electrical insulation in finished ap
Determine about the microtubules The microtubules are hollow tubular structures formed by a special arrangement of two proteins called the alpha and beta tubulins. The microtu
Determine People who are at risk from drug-nutrient interactions? People who are at risk from drug-nutrient interactions are the: 1. Persons who have a poor diet or in other
Defective extra-preputial protrusion of the penis This defect is a result of hypoplasia or a defective penile erection due to a congenital mucosal fold – the frenulum - betwee
Ask questionImagine you are studying a group of amphibian species that vary in their habitats, some living in dense murky water, and others living in very clear ponds. What kind of
Explain the Advantages of Double Beam Method? The double beam method has advantage over single beam as it automatically corrects, for the change in light transmission, through
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