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
What is vernalisation? How is the process of vernalisation benefits to plants?

What do you determine by Mantle? A thin sheetlike membranous extension of visceral mass of molluscs which forms two flaps of skin. Mantle secretes the shell on the dorsal side

Define Criteria for Assessment of Riboflavin Status? Riboflavin status can be assessed by measuring urinary excretion of the vitamin in fasting, random, and 24-hour specimens o

Agreed-upon Procedures - Non-assurance Engagements Within an engagement to present agreed-upon procedures, the auditor is engaged to carry out those procedures of an audit nat

S p ir ochetosis (tick fever) This is disease of young birds under poor management mostly reared as backyard poultry caused by a spiral bacterium, Borrelia anserina and tr

Of the following, which mechanisms are significant in the death of erythrocytes (pron: eh-rith-reh-sites) in human blood? Is it a) Phagocytosis (pron: fag-eh-seh-toe-sis) b)

Explain Supravalvular aortic stenosis murmur? Supravalvular Aortic Stenosis Murmur : Characteristic: Murmur may be loudest in 1st Right ICS. It isn't associated with systolic

Biodiversity is multiple resource based offering us a range of products, materials and services. Our survival and well being of man-kind is directly dependent on biodiversity. Biod

What is Radiographic Template Radiographic Template : You should always use it while taking a panoramic radiograph of the patient. It is done to counter the effect of magnific

Ask question #Minimum 100 hhejejhjehjwords accepted#