Available Answers

1. 1.

   Name the following:

   1. The nitrogen cycle step involving nitrobacter bacteria.
   2. The industrial manufacturing process of ammonia.
   3. A nitrogen explosive.
   4. A relationship in which plant and bacteria both are mutually benefited
   5. A refrigerant for freezing food.
2. 2.

   Write T for True and F for False. Correct the false statement(s).

   1. Nitrogen is used in manufacturing of nitrogenous fertilizers such as trinitrotoluene.
   2. Nitrogen fixation is the process by which combined nitrogen in the atmosphere is converted into soluble nitrogen compounds.
   3. In ammonification, bacteria decompose the remains of dead plants and animals and break down protein to release nitrate.
   4. Pseudomonas bacteria convert soluble nitrate to free nitrogen by denitrification.
   5. Nitrobacter bacteria converts nitrates to nitrites.
3. 3.

   Observe the figure and answer the questions.

   

   1. Which of the figure shows slow oxidation?
   2. Give another example of slow oxidation.
   3. What are the products of rapid oxidation?
   4. What is the other name of rapid oxidation?
   5. Which of the figure depicts rapid oxidation?
4. 4.

   Write T for true and F for false. Correct the false statement(s).

   1. Green plants, through respiration, form glucose with the help of carbon dioxide and water in the presence of sunlight.
   2. The accumulation of greenhouse gases has heated up the atmosphere. leading to global warming.
   3. Carbon dioxide is combustible nor supports combustion. hence is used in photosynthesis.
   4. The sharp and sour taste in the soda water is due to the formation of sulphuric acid.
   5. Dry ice is a solid form of carbon dioxide that acts as a good refrigerant.
5. 5.

   Choose the correct option to fill in the blanks.

   1. Undesirable gases and particles present in the air that can have harmful effects on plants and animals are called _______________ (air pollutants/catalysts).
   2. Natural processes, like volcanic eruptions and forest fires are the sources of _______________ (air/water) pollution.
   3. Wetlands. water logged and flooded areas. and rice farming release _______________ (ozone/methane) gas.
   4. Carbon dioxide, water vapour. nitrous oxide, and _______________ (methane/oxygen) are greenhouse gases.
   5. _______________ (Wet scrubbers/VOC) should be used in factories to absorb sulphur dioxide from the exhaust.
6. 6.

   Name the following.

   1. The catalyst used in laboratory preparation of oxygen from potassium chlorate.
   2. The bacteria which fixes the free atmospheric nitrogen into soluble nitrates
   3. Discoverer of nitrogen.
   4. The gas manufactured by the Haber-Bosch process.
   5. The phenomenon caused by the greenhouse gases.