how animals grow and develop

An animal performs all its life functions with an aim to be alive till it matures and reproduces. Reproduction is the ability of living organisms to produce new individuals similar to themselves. Reproduction ensures perpetuation and survival of their species. It leads to an increas..

In rats, as in all vertebrates, sexes are separate. Male and female exhibit several differences in their external features. The Male reproductive system consists of a pair of testis that are enclosed in scrotal sacs, a pair of vas deferens, a seminal vesicle, ejaculatory duct and penis. The female ..

This is a very important step in photography. This process can be done only with the exposed film. The exposed film is developed only in dark using some alkaline solutions like quinol or pyrogallol. The alkaline solutions act as developers by reducing silver bromide to silver. ..

The environment in which the man and other organisms live is called the biosphere. The biosphere is made up of different regions that have different types of flora (plants) and fauna (animals). The types of organisms in an area are determined by various factors such as the climate, ..

. The first half of the phase and the changes in these phases are controlled by estrogens and progesterone. The secretion of these hormones occur cyclically because of the cyclic secretions of pituitary gonadotropins in the female. The fertilised ovum in mammals and other higher animals p..

Stamen forms the male reproductive unit and is made up of anther and the filament. The anther is generally bilobed with chamber containing several pollen grains. Pollen grains are produced in the anther . A very young anther comprises a mass of undifferentiated thin - walled cells bounded by an epi..

="left"> Keep growing through out their life and are localized in the apical meristem Growth stops after maturation but body cells are replaced periodically. Growth is uniform and proportionate Manufacture their own food by photosynthesis Cannot make their own food. They depend directly o..

Plants Animals Cellulose cell wall surrounds the cell membrane Cell wall is absent in animal cells Plastids are present-especially a green pigment called chlorophyll. Chlorophyll is absent in animal cells. large vacuoles containing cell sap are presen..

All the events which change a zygote into a fully developed organism is called embryonic development. The entire process of development is called embryogenesis. Von Bear is called the "Father of Modern Embryology..

The importance of maintaining the ecological balance and conservation of the resources has been increasingly becoming clear in the last two decades. It has now become necessary for all countries in the world to recognise this fact and plan what is known as 'sustainable development'. The ..