BIOLOGY

GILLS

Fish and tadpoles are aquatic vertebrates. They possess gills for gaseous exchange. Gills of fish Fish has four gills on each side of the head. Each gill has two rows ...
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ALIMENTARY CANAL OF PLANARIA

Planaria is a free-living, flat, slender and small worm. The digestive tract consists of a ventrally placed mouth, muscular pharynx and intestine. The pharynx can be protruded from the mouth ...
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GEOTROPISM

This is the response of plant parts to the stimulus of gravity. Plant shoots grow away from gravity of the earth and are said to be negatively geotropic. Roots grow ...
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ORGAN OF SIGHT

The eyes are the organs of sight in the higher invertebrates and all vertebrates. They (eyes) are equipped with photo receptors (rods and cones) to detect light. Most of these ...
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EXCRETION IN PLANTS

There are no special excretory organs or systems in plants. The plants as living things do carry out excretion. Elimination of certain waste takes place through the stomata and lenticels ...
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OXYGEN DEBT

The oxygen needed to oxidize lactic acid to pyruvic acid and from pyruvic acid to carbon oxide, water and chemical energy is called Oxygen debt. The quick heavy breathing to ...
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TRANSLOCATION

Translocation is the transport of manufactured food substances from the leaves to all parts of the plant. The movement is usually described as downwards from the leaves to the roots ...
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EXPERIMENTS ON PHOTOSYNTHESIS

The occurrence of photosynthesis in plants can be shown by experiments. The easiest proof that photosynthesis has taken place is to test for the presence of starch in the green ...
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PLANT NUTRITION

Photosynthesisis the process by which carbohydrates or sugars are manufactured in the green parts of the plants containing chlorophyll by combination of carbon (IV) oxide and water with the aid ...
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PARASITIC NUTRITION

This is a type of nutrition in which one organism obtains food from another organism and during the feeding process one organism is harmed and does not benefit. The organism ...
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