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!
Bi-Parental Reproduction
In sexually reproducing metazoans, there are separate and distinct male and female individuals. Each has its own reproductive system and produces one kid of sex cell, spermatozoon or egg. Nearly all vertebrates and many invertebrates have separate sexes, and such a condition is celled dioecious and this type of reproduction is called biparental reproduction. However, some animals such as most flatworms, some hydroids, annelids, crustaceans and some fishes have both male and female organs in the same individual. Such a condition is called hermaphroditism. In contrast to the dioecious state of separate sexes, hermaphrodites are monoecious, having both male and female organs in the same organism Most of the hermaphrodites avoid self-fertilization by exchanging germ cells with each other.
For example, although the earthworm bears both male and female organs, its eggs are fertilised by the copulating male and vice versa. Hermaphrodites also prevent self-fertilisation by developing eggs and sperms at different times. If we admit that all living things are mortal, that every living organism is endowed with a life span that must eventually end, then reproduction is indispensable for the continuance of species. During evolution the efficiency of reproduction increased where the parents protect and provide nutrition for the young before or after birth. The adaptations that are found in vertebrates are internal fertilisation, the cleidoic (enclosed in shell) egg, and the foetal membranes. Parallel adaptations are also found in lower animals.
HEAR T - The cells called cardiocytes of atria of the heart secrete peptide hormone called atrial natriuretic factor (ANF) in response of an increased return of the deoxygen
Exterrral and Internal Environment Let us try to understand the concept of environment with some examples. Can you identify the environment of a single carp fish in the pond? It
Q. What are the major significant organic molecules for living beings? Ans. There are many types of organic molecules that are important for the living beings. Particularl
Explain brefiely the chemical equations? Chemical Equations : A chemical equation is a shorthand way of describing a chemical reaction. For example, in the formation of wate
Which are the characteristics and organs of the digestive system of earthworms related to the type of diet of these animals? Earthworms eat decomposing organic material and sma
What is cell biology? Cell biology is the science of studying how cells function like as their reproduction and metabolism, their internal and external anatomy.
Explain the Indole Production Test? Many microorganisms produce an enzyme tryptophanase which oxidizes amino acid tryptophan to produce pyruvic acid, indole and ammonia. We can
Explain about Folic acid Folic acid occurs as a yellow or orange-yellow, microcrystalline powder, almost without odour and taste. Water content of folic acid is up to 8.5%. Fol
Question 1 Discuss eukaryotic replication Question 2 Write an account on eukaryotic transcription factors Question 3 Write a detailed account on eukaryotic translation e
What is Cilia and Flagella? The surfaces of many eukaryotic cells bear cilia or flagella, built from specialized microtubules. Cilia are tiny brushlike hairs, and flagella are
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