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(1ai)
- Tadpole - Skin
- Cockroach - trachea
- Domestic fowl - lungs
- Talinum - stomata
- Earthworm - Skin
- Amoeba - cell membrane
(1aii)
- Large surface area
- Thin respiratory surface
- Moist surface
- Efficient transport system
- Permeability
(6ai)
The enormous energy of lightning breaks nitrogen molecules and enables their atoms to combine with oxygen in the air forming nitrogen oxides. These dissolve in rain, forming nitrates, that are carried to the earth.
(6aii)
This organism oxidizes ammonia into nitrite as a metabolic process. Nitrosomonas are useful in bioremediation. They are important in the nitrogen cycle by increasing the availability of nitrogen to plants while limiting carbon dioxide fixation.
(6aiii)
Azotobacter helps to synthesizes some biologically active substances, including some phytohormones such as auxins, thereby stimulating plant growth.
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