CIE Biology Paper-4: Specimen Questions 109 - 111 of 120

Question number: 109

Short Answer Question▾

Write in Short

What do you mean by sedimentary cycle.

Explanation

Sedimentary cycle involves the transportation of nutrients through the ground to water or we can say from the lithosphere to hydrosphere. Examples are –phosphorous cycle

Question number: 110

Short Answer Question▾

Write in Short

The figure shows mouth structure. Label the part A, B and C?

The figure shows mouth structure with labelling

The figure shows mouth structure with labelling

The figure shows mouth structure Label the part A, B and C

Explanation

A- Pharyngeal tonsil

B-Palatine Tonsil

C-Lingual tonsil

Question number: 111

Essay Question▾

Describe in Detail

What control methods are used to control particulate air pollutants?

Explanation

Two types of devices are used to control particulate air pollutants from the environment. 1- arresters 2. Scrubbers

1- Arresters- These devices are used to separate particulate pollutants. These separators may be of many types. For example- Cyclone separator, Trajectory separator, Gravity settling chamber, Filters and electrostatic precipitator.

2- Scrubber-Dust can be separate by scrubber. Scrubbers can be of two types (a) Wet scrubber (b) Dry scrubber

Wet scrubber describes a variety of devices that remove pollutants from a furnace flue gas streams and dry or semi-dry scrubbing system does not saturate the flue gas stream that is being treated with moisture.

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