Types of development of animals, Biology

Types of Development of Animals

Different animals have evolved various methods of development. These methods can be broadly categorized into two categories

(i) Direct development

(ii) Indirect development.

Direct development

In a number of animals whose eggs have little or no yolk, such as the placental mammals, the embryos develop and grow in the womb of the mother from that they also obtain nourishment. Once, the offspring has developed to a stage in which it looks like a miniature adult, the mother gives birth to it. This young one acquires its adult size and sexual maturity after birth over a period of time via gradual growth. In animals whose eggs have a large amount of yolk such as those of the birds and reptiles, the eggs grow oviparously outside the mother's body. Young ones resembling the miniature adults hatch out. The young individual then attains adult size and sexual maturity by gradual growth over a length of time.

Indirect development

In many animals like frog Amphioxus, Herdmania, insects and several other invertebrates and vertebrates, the offspring which hatches out from the egg looks extremely different from the adult form, and is called a larva. The larva leads an independent presence for some time that varies from species to species, and then transforms into a miniature adult by the process of metamorphosis.

Posted Date: 1/30/2013 5:45:48 AM | Location : United States







Related Discussions:- Types of development of animals, Assignment Help, Ask Question on Types of development of animals, Get Answer, Expert's Help, Types of development of animals Discussions

Write discussion on Types of development of animals
Your posts are moderated
Related Questions
Classification of the Phylum Protozoa up to orders

Explain the Sources of Microorganisms? Microorganisms are virtually present everywhere in nature including air, water and soil. The microbial flora is also associated with the

Define Protein Requirements during Sepsis? Adequate amount of protein is required by these patients to improve immunity against infections, promote recovery, spare lean body ma

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Q. What is ascaris? What is the disease caused by this worm? Ascaris lumbricoides or Ascaris is an animal of the nematode phylum that is a roundworm. Ascaris causes ascariasis,

#qwhy is it necessary to grind the foo sample before testing uestion..

Q. What are the organs that are part of the male genital system? The organs that comprise the male genital system are the testicles, the vas deferens, the seminal vesicles, the

Q. What are the dietary goals for diabetes? Well here they are. These are to: 1. Supply optimum nutrition to maintain good health, 2. Provide calories for maintaining ide

Glanders The disease, also known as equine nasal phithisis, farcy or malleus, is highly infectious anthropozoonosis and is caused by Burkholderia (earlier Pseudomonas) mallei.

Define Assessment of Chromium Status? No specific tests are currently available, which could help us to determine chromium status. Another reason being the chromium content of