Ovipary, vivipary and ovovivipary, Biology

Assignment Help:

Ovipary, Vivipary and Ovovivipary

In each case of external and in some cases of internal fertilisation, development of the fertilized egg (zygote) occurs outside the mother's body. The egg is laid either in water or in soil, on plants, or in the body of their hosts in case of specific parasites. Ail such animals or called oviparous (laying eggs). A number of exceptional cases of non-chordates showing, vivipary that is giving birth to young ones nourished by the genital tracts of the female, are found in some insects like tsetse fly (Glossina). A third condition is that of Ovovivipary. In this case, after fertilisation the zygote is retained in the female reproductive system with no any direct connection with the maternal tissues for providing nourishment. Here it undergoes development. Finally the eggs hatch still inside the female and the young ones are "born". This happens for instance in certain flies.


Related Discussions:- Ovipary, vivipary and ovovivipary

Briefly explain about the chromium, Briefly Explain about the Chromium? ...

Briefly Explain about the Chromium? As you will go through this section, you will realize that compared to other minerals, the essentiality of chromium was recognized very late

Show endocrine glands involved in the menstrual cycle, Q. What are the endo...

Q. What are the endocrine glands involved in the menstrual cycle? What are the hormones in action? The endocrine glands that secrete hormones involved in the menstrual cycle ar

How are triglycerides made, How are triglycerides made? Triglycerides, ...

How are triglycerides made? Triglycerides, fats or oils, are made of three molecules of fatty acids bound to single molecule of glycerol. Hydroxyls of each one of the three fat

Isolated fibre required for diabetes patient, Q. Isolated fibre required fo...

Q. Isolated fibre required for diabetes patient? Isolated fibre: It is generally recommended that diabetics should substitute whole wheat flour with soya flour, whole Bengal f

Which molecule should be most radioactive, Yeast is cultured in the presenc...

Yeast is cultured in the presence of radioactive phosphate and the following biological molecules are purified. Which molecule should be most radioactive? A. An oligosaccharide B.

Human respiration, Human respiration Human beings are adopted for ter...

Human respiration Human beings are adopted for terrestrial mode of life. They conduct pulmonary respiration. This system consists of external nostrils, nasal cavities, pharyn

Find cellular machinery for the replication of nucleic acids, Which of the ...

Which of the following statements is true? Answer Viruses are distinct from cells by the absence of a lipid membrane around them. Viruses are parasites that require the cell's meta

Bacterial growth, 1. Given a log phase bacterial culture with 1 x 106 cells...

1. Given a log phase bacterial culture with 1 x 106 cells per ml and a generation time of 20 minutes, how long does it take the culture to reach a density of 6.4 ? 107 cells per ml

Define proteins as structural elements and structural units, Define Protein...

Define Proteins as Structural Elements and Structural Units? The liver cell membrane analysis shows that this membrane contains 50-60% protein, 35% lipids and 5% carbohydrates.

Explain fibre and cardiovascular disease (cvd), Explain Fibre and Cardiovas...

Explain Fibre and Cardiovascular Disease (CVD)? The role-of dietary fibre in modulation of blood lipids was demonstrated by Keys and his co-workers in a series of experiments c

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