level of organization in plant and animal

. Deficiency of growth hormone causes dwarfism and over secretion causes gigantism in the young and acromegaly in adults. Pancreatic Islets of langerhans secrete insulin on being stimulated by a rise in blood sugar or blood amino-acid level. Insulin lowers the blood sugar by increasing th..

Animals are different from plants because of their ability of locomotion. This ability probably developed as they have to search for food, unlike the plants that are autotrophic. Since they move from one place to another, the animals have to continuously enco..

In unicellular organisms the cell leads a totally independent life. It does not depend on any other cell for any of its activity, except in cases of sexual reproduction. There is division of labour only at the organelle level since different organelles perform specific functions..

Some plants have an ability to fix nitrogen from the atmosphere through a process called symbiotic nitrogen fixation. The symbiotic bacterium Rhizobium is found in association with the root nodules of the leguminous plants such as beans, peas, gram and groundnut. The association..

One of the indirect evidences for evolution comes from the study of homologous organs in organisms that exist today. Homologous organs are those, which have the same basic structure, but different functions. For example, an examination of the forelimb skeleton in diff..

Some bacteria are known to fix the atmospheric nitrogen for their own biological activity. This natural phenomena is commercially utilized to increase the nutrient supply to crops. There are two types of nitrogen fixing bacteria. They are a) Symbiotic N 2 fixing bacteria - well known example of thi..

. Most of the drugs and pharmaceuticals are also organic compounds. In agriculture too, organic chemistry is well represented. Fertilizers like urea, pesticides like DDT, malathion and gammaxene, and plant growth regulators are all organic chemicals. Among va..

Globally sea levels have risen 4-8 inches over the last century. The high temperatures have already started melting polar ice caps sea icebergs and glaciers. This has released enormous amount of water. Warmer temperatures also heat water and make it expand; thus ocean levels ne..

The space between soil particles on the surface of earth is called pore space. This is of two types, micro pores and macro pores. Most of the water is held in the micro pores. These pores are available for plant roots Surface soil pore spaces are generally filled with air and water. W..

Animal Cell Plant Cell Usually smaller in size. Usually larger in size. Cell wall absent. Cellulose in any form is absent. Cell wall made up of cellulose is present. Cytoplasm is denser, more granular and occupies most of the space in the cell. Cytoplasm is pu..