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.
Q. What are persistent organic pollutants (POPs)? The POPs, or persistent organic pollutants, are toxic substances formed from organic compounds. The POPs are made in several i
Canine distemper Canine distemper, a highly contagious disease of dogs, is caused primarily by air- borne virus which belongs to the genus Morbillivirus in family Paramyxoviri
Q. Define Neural and Neurotransmitter Control? Coronary arteries are richly innervated by adrenergic and parasympathetic nerves. Both alpha 1 and alpha 2 adrenergic receptors a
Animals - Rapidly Flowing Waters In the exposed rock surface habitats only those organisms are found which have efficient mechanisms for staying in one place. In fact despite
Q. What is the prothallus of pteridophytes? The gametophyte develops by mitosis from a spore and Prothallus is the pteridophyte gametophyte (the haploid individual that forms g
Defines the tenants of Pangenesis Theory Which of the following best defines the tenants of Pangenesis Theory? A. The hereditary material is composed in every organ/tissue a
Partial Pericardiectomy : The approach can be either by a left anterolateral thoracotomy or median sternotomy. For pyogenic pericarditis with adhesions and loculations a par
Define Gonads and Reproductive System? With aging, there is decrease in pituitary hormone secretion causing decrease in gonadal hormone production, which causes number of chang
Define measuring body composition- Multiple isotope Dilution? Multiple isotope dilution (Total and extracellular body water): It is based on the principle that certain substanc
Mesophytes These plants grow in moist habitats and well-aerated soils. They prefer soil and air of moderate humidity but fail to swive in areas with water-logged soils or oveta
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