351: In the cities of our country, which among the following atmospheric gases are normally considered in calculating the value of Air Quality Index?
1. Carbon dioxide
2. Carbon monoxide
3. Nitrogen dioxide
4. Sulfur dioxide
5. Methane
Select the correct answer using the code given below.
(a) 1, 2 and 3 only
(b) 2, 3 and 4 only
(c) 1, 4 and 5 only
(d) 1, 2, 3, 4 and 5
352: Which of the following pairs of substances can be completely separated by sublimation ?
(a) Sand and iodine
(b) Ammonium chloride and iodine
(c) Sand and sulphur
(d) Salt and sulphur
353: A universal donor has the blood group belonging to:
(a) A
(b) B
(c) O
(d) AB
354: Which one of the following processes in the bodies of living organisms is a digestive process ?
(a) Breakdown of proteins into amino acids
(b) Breakdown of glucose into CO2 and H2O
(c) Conversion of glucose into glycogen
(d) Conversion of amino acids into proteins
Explanation:
The process of digestion breaks down complex food molecules (such as the protein in steak) that the body cannot readily use into simpler, smaller molecules (amino acids) which the body can absorb and use to fuel other life processes. The digestive tract performs this mission like a machine. Each organ has a specific job and depends on the other to perform properly. In the mouth, initial physical break-down of protein begins. The stomach continues physical break-down and begins chemical break-down by secreting a substance called pepsinogen. It then converts pepsinogen into an enzyme called pepsin. This enzyme starts to break apart the protein into amino acids.Muscles in the stomach walls then move the food into the duodenum, the first part of the small intestine. The duodenum and pancreas work together to complete the chemical break-down of protein into single amino acid molecules with the help of another enzyme known as trypsin. Finally, the small intestine absorbs the amino acid molecules, allowing them to pass into the bloodstream. The blood then carries th amino acids to the rest of the body to rearrange into human proteins and use in building its structure. Each part of the "machine" of digestion must work properly in order for protein to be broken down into useful amino acids.
355: Consider the following statements :
I. Tapeworm is a hermaphrodite.
II. Round-worm has separate sexes.
III. Filaria is caused by a nematode.
IV. Guinea-worm is an annelid.
Which of these are correct ?
(a) I and II
(b) I, II and III
(c) III and IV
(d) II, III and IV
Explanation:
Tapeworm (Taenia solium) is a hermophrodite causing Taeniasis. It is parasitic in the intestines of humans and other invertebrates and is transmitted through consumption of infected 'pork' called 'measly pork'.
Filarial worm (Wuchraria bancrofti) is a nematode causing filariasis transmitted through cules mosquito leads to enlargement of lymph nodes.
Guinea worm is a nematode. It is parasitic round worm lives in the abdomen or beneath the skin of humans and other invertebrates.
Round worms are nematodes which have separate sexes (unisexual).
Hermaphrodite is an organism with both the sexes in the same body (bisexual).