PATHWAY OF AIR IN THE RESPIRATORY TRACT


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Mohl's half leaf experiment

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Experiment to demonstrate Moll’s half-leaf experiment for showing that CO 2 , light, chlorophyll and water are necessary requirements for photosynthesis: Requirements: A potted plant, caustic potash, wide- mouthed bottle, iodine, split cork, water Method: 1. De-starch a potted plant by putting it in complete darkness for two days. 2. Fill partly a wide-mouthed bottle with strong solution of caustic potash and fit a split cork on its mouth. 3. Insert about half of the portion of a leaf of the de-starched plant into the bottle through the split cork (Fig. 36). 4. Place the whole apparatus in light after applying grease on the upper portion of split cork, and test the leaf for stach after about 10 hours. Observations: Portions of the leaf inside the bottle as well as in between the split cork show negative test for starch indicating the absence of photosynthesis while the portions outside the split cork show positive test for starch indicating the presence of process of photosynthesis in ...
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NATURAL RESOURCES

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Anything obtained from the natural environment to meet our needs or is important for our survival is a natural resource. Thus, air,water,and soil are necessary for survival; whereas metals,other minerals (including fuels),and forests serve to meet our needs. These are all examples of natural resources. Technological advancements has enabled us to keep adding to  this of resources to support our changing lifestyles. These can be called as human made resources. Plastics, optic fibres and synthetic fibres are examples of such resources. AIR Air is a mixture of gases constituting mainly of nitrogen and oxygen and to a smaller extent carbon dioxide,noble gases,a small percentage of water vapour and traces of other gases. Their respective composition are: Nitrogen: 78.084% Oxygen: 20.947% Carbon dioxide: 0.033% Argon: 0.934%  Air is very essential for our survival. When we say this, we often refer to oxygen but even other gases are also of equal importance. About 75% of the earth's ...
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Plant Parts and Their Functions –

The Root The main functions of the root system are absorption of water and minerals from the soil, providing a proper anchorage to the plant parts, storing reserve food material and synthesis of plant growth regulator.  The Stem. Some stems perform the function of storage of food, support, protection and of vegetative propagation.   The Leaf Leaves perform the function of photosynthesis and transportation.They make the food ,helps in release of extra water from plants and exchange of gases. They are called "food factory of plant " and also as " Nose of the plant" .  Leaf Venation The arrangement of veins and the veinlets in the lamina of leaf is termed as venation. When the veinlets form a network, the venation is termed as  reticulate . When the veins run parallel to each other within a lamina, the venation is termed as parallel. Leaves of  dicotyledonous  plants generally possess reticulate venation, while parallel venation is the characteristic of most...
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