Determination of sex in living organisms
Determining male or female form of living organism through sexual reproduction is called as sex determination. Sex determination on a large scale is of two types- environmental, genetic and chromosome based.
sex determination
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Some specific Endocrine Glands and their Hormones
The ductless gland found on kidney is called as adrenal gland. Each kidney has an adrenal gland on it. This gland is also called as “Supra Renal Gland”. It has two parts- the upper- cortex and the lower- medulla.
Nervous System of Animals
Most of the animals have a network of very fine filamentous or threadlike structures which exchanges information. These structures are called as nerves.
Various Important Alternatives to Deforestation
Deforestation contributes up to 20 percent of greenhouse gas emission which is more than the combined emission by all the cars, trucks, planes, boats and, trains of the world. Deforestation threatens our climate. Besides this, it threatens the livelihoods of 1.6 billion people who depend on forests for food and economic activities. They serve as habitats to rare and so far, undiscovered species of plants and animals. They also play a key role in maintaining water cycles and preventing floods and soil erosion. Hence, forests across the world need urgent measure of protection by all possible ways, may it be through alternatives to deforestation.
Ecosystem analysis: Understanding Complex Ecosystems
The biosphere has been composed of a number of highly complex ecosystems such as forests, grasslands, oceans, estuaries, deserts etc. These ecosystems have gone under threat over the years due to intensive human pressure of serious pollutions, habitats destructions, land, water bodies, wetlands and coastal zones reclamations and so on.
Baya, A Bird – Architect
Most of you us have seen the Baya birds – peculiar birds of monsoon season. These beautiful birds are found in many states of India and of course in many other countries of the world. These birds are also found all over Java and Sumatra.
Animal Husbandry and Milch Cattle
We rear and take care of animals to take their support in food production. Their systematic and proper rearing and also the arrangement for their proper reproduction and management are called as Animal Husbandry.
Toucan- a cute and cruel but friendly and smart bird
Toucan is a cute and friendly bird with a small rounded tail and a long, red and amazing bill. It belongs to family Ramphastidae of zoological order Piciformes belonging to the genus Ramphastos.
There are 37 species in Ramphastidae and the largest birds are known as Toco toucan. The bird about which we are going to talk about right now is the Toucan – yes, the Ramphastos aerial. You might have seen some famous TV serials with Toucan as one of the leading characters on the National Geographic; or some famous children’s films with Toucan as here- like Rio-.
Dynamics of Population
A population is a group of individuals (all members of a single species) who live together in the same habitat and are likely to interbreed. Each population has a unique physical distribution in time and space. It may contain individuals of different ages, and its size (density) is likely to change over time. It grows or shrinks according to the reproductive success of its members.
More Earthen Lamps May Light Homes This Diwali
Traders have turned faces against Chinese goods this Diwali season. It has increased the hopes of Soil Workers (Potters) in India.
Games and Sports: Yesterday, Today and Tomorrow
Games are essential for physical and mental development of children.
