41. Algal bloom results from –

1. Global warming
2. Salination
3. Eutrophication
4. Biomagnification

Option “3” is correct.
Eutrophication is one of the most widespread environmental problems of inland waters, and is their unnatural enrichment with two plant nutrients, phosphorus and nitrogen. One important result of lake and reservoir enrichment is increased growth of microscopic floating plants, algae, and the formation of dense mats of larger floating plants such as water hyacinths and Nile cabbage.
42. If waste materials contaminate the source of drinking water, which of the following diseases will spread?

1. Scurvy
2. Typhoid
3. Malaria
4. Anaemia

Option “2” is correct.
Typhoid fever is an acute infectious illness associated with fever that is most often caused by the Salmonella typhi bacteria.It spread through contaminate the source of drinking water.
43. Symbiotic Bacteria responsible for the fixation of atmospheric nitrogen are present in –

1. Peas
2. Wheat
3. Corn
4. Oats

Option “1” is correct.
Symbiosis is a relationship between two or more organisms that live closely together. Symbiotic Bacteria responsible for the fixation of atmospheric nitrogen are present in Peas.
44. Children especially in western countries who receive very little sunshine suffer from –

1. Rickets
2. Dermatitis
3. Scurvy
4. Measles

Option “1” is correct.
Children especially in western countries who receive very little sunshine suffer from Rickets.
45. Companion cells are unique to?

1. Bryophytes
2. Pteridophytes
3. Angiosperms
4. Gymnosperms

Option “3” is correct.
The thin-walled, elongated, specialised parenchyma cells, which are associated with the sieve elements, are called companion cells. They are present only in angiosperms and are absent in pteridophytes and gymnosperms.
46. Lacrymal glands are situated in the?

1. Palms
2. Buccal cavity
3. Eye orbit
4. Stomach

Option “3” is correct.
Lacrymal glands are situated in the Eye Orbit.
47. Which mosquito is the carrier of Zika virus?

1. Culex
2. Aedes
3. Anopheles
4. Culiseta

Option “2” is correct.
Zika virus disease is caused by a virus transmitted primarily by Aedes mosquitoes.
48. The blotting technique used to identify the isolated protein is ________

1. Northern blotting
2. Western blotting
3. Southern blotting
4. Cloning

Option “2” is correct.
The western blot is a widely used analytical technique used to detect specific proteins in a sample of tissue homogenate or extract. Southern bolting is a method used for detection of a specific DNA sequence in DNA samples.
49. Sphygmomanometer measures the blood pressure in the-

1. Veins
2. Arteries
3. Eyes
4. Synovial

Option “2” is correct.
Blood pressure is measured by instrument called sphygmomanometer also called asblood pressure meter, it is used to measure the pressure of blood in Arteries.
50. The sigmoid colon is a part of-

1. Small Intestine
2. Large Intestine
3. Pharynx
4. Rectum

Option “2” is correct.
Sigmoid colon, a terminal section of the large intestine that connects the descending colon to the rectum and its function is to store fecal wastes until they are ready to leave the body.
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