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Question 41
A
uriniferous tubules 
B
Bowman's capsule 
C
glomerulus 
D
malpighian capsule 
E
renal artery 
Explanation.

The uriniferous tubules refer to each of the long, fine, convoluted tubules conveying urine from the glomeruli to the renal pelvis in the vertebrate kidney. Water and salts are reabsorbed into the blood along their length.


Correct Option:
A
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Question 42
A
renin 
B
amylase 
C
lipase 
D
lactase 
E
pepsin 
Explanation.

There are two common ways of achieving hydrolysis of milk proteins. You can either boil in a strong acid/ base for a very long time, or use an enzyme like PANCREATIC PROTEASE to simulate hydrolysis naturally. Pepsin is an example of pancreatic proteases.


Correct Option:
E
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Question 43
A
Water 
B
Oil 
C
Drugs 
D
Proteins 
E
Sugars 
Explanation.

Kwashiokoris a nutritional disorder most often seen in regions experiencing famine. It is a form of malnutrition caused by a lack of protein in the diet.


Correct Option:
D
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Question 46
A
Molecules from solution of higher concentration to low concentration 
B
Molecules from solution of low concentration to high concentration 
C
Water from solution of high concentration to low concentration 
D
Water across a semi-permeable membrane from solution of low concentration to high concentration 
E
Water across a semi-permeable membrane from solution of high concentration to low concentration 
Explanation.

Osmosis is a special case of diffusion in which only water molecules move from a region of high concentration to one where they are in low concentration through a semi-permeable membrane.


Correct Option:
E
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Question 47
A
Tannins 
B
Oxygen 
C
Carbondioxide 
D
Sap 
E
Alkaloids 
Explanation.

Plants need to excrete excess carbon dioxide and oxygen. Carbon dioxide is a waste product of aerobic respiration in plant cells. Oxygen is a waste product of photosynthesis. Also,Extracts from plants contains toxic alkaloids.


Correct Option:
D
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Question 48
A
Mucor, Spirogyra and Paramecium 
B
Penicillium, Paramecium and Amoeba 
C
Mucor, Rhizophus and Penicillium 
D
Amoeba, Spyrogyra and Mucor 
E
Rhizophus, Ascaris and Amoeba 
Explanation.

Rhizopus reproduce by forming asexual and sexual spores; only sexual reproduction occurs in Ascaris whileAmoeba reproduces asexually.


Correct Option:
E
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Question 49
A
Cholera 
B
Gonorrhoea 
C
Tuberculosis 
D
Onchoceriasis 
E
Typhoid 
Explanation.

Onchocerciasis is another name for river blindness. It is caused by the NEMATODE, Onchocerca volvulus.


Correct Option:
D
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Question 50
A
the activities of denitrifying bacteria 
B
the breakdown of ammonium salts in the soil 
C
the activities of nitrifying bacteria 
D
the activities of nitrogen-fixing bacteria in root nodules 
E
egestion, death and decay 
Explanation.

The nitrogen in the soil is converted to atmospheric nitrogen by the process of DENITRIFICATION. This is done by the action of denitrifying bacterias eg several species of Pseudomonas.


Correct Option:
A
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