IGCSE Biology Paper-4: Specimen Questions with Answers 109 - 111 of 279
Glide to success with Doorsteptutor material for Bank-PO : get questions, notes, tests, video lectures and more- for all subjects of Bank-PO.
Question 109
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 110
Write in Short
Short Answer▾The figure shows mouth structure. Label the part A, B and C?
Explanation
A- Pharyngeal tonsil
B-Palatine Tonsil
C-Lingual tonsil
Question 111
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.