31. The main function of the cornea present in the human eye is__:
[A] structural support to the eye
[B] bends light before it reaches the lens
[C] changes the shape of the lens enabling image to be focused on the retina
[D] contains a concentrated amount of cone cells on the correct orientation
Show Answer
Correct Answer: B [bends light before it reaches the lens]
Notes:
The main function of the cornea present in the human eye is to bend light before it reaches the lens.
32. What is the purpose of the rib cage?
[A] protect the stomach
[B] protect the spinal cord
[C] protect the heart and lungs
[D] provide an object to which the lungs can attach
Show Answer
Correct Answer: C [protect the heart and lungs]
Notes:
Ribs perform two functions in the body. They protect the heart and lungs. It controls the movement of air in and out of the lungs. When the ribs move up, the chest cavity expands and air moves into the lungs. When they go down, the air is forced out of the lungs.
33. Approximately how many liters of blood does the heart pump throughout the body in a day?
[A] 9.7 litres
[B] 7.7 litres
[C] 5.7 litres
[D] 3.7 litres
Show Answer
Correct Answer: C [5.7 litres]
Notes:
The heart pumps about 5.7 liters of blood throughout the body in a day.
34. Which of the following is used to absorb fluids and salts remaining after the completion of intestinal digestion and absorption and to mix its contents with a lubricating substance, mucus?
[A] Cecum
[B] Colon
[C] Rectum
[D] None of these
Show Answer
Correct Answer: A [Cecum]
Notes:
The cecum is used to absorb fluids and salts remaining after the completion of intestinal digestion and absorption and to mix its contents with a lubricating substance, mucus.
35. A renewable, biodegradable fuel that is manufactured from vegetable oils and animal fats are called __
[A] Bioethanol
[B] Biomethane
[C] Biodiesel
[D] None of these
Show Answer
Correct Answer: C [Biodiesel ]
Notes:
A renewable, biodegradable fuel that is manufactured from vegetable oils and animal fats are called Biodiesel
36. What is an autonomously repeating circular extra-chromosomal DNA?
[A] Bacteria
[B] Nitrogenous base
[C] RNA
[D] Plasmid
Show Answer
Correct Answer: D [Plasmid]
Notes:
A plasmid is an autonomously repeating circular extra-chromosomal DNA. They naturally exist in bacterial cells, and they also occur in some eukaryotes.
37. What is another name of rDNA technology?
[A] chimeric DNA
[B] information technology
[C] information DNA
[D] chimeric technology
Show Answer
Correct Answer: A [chimeric DNA]
Notes:
chimeric DNA is another name of rDNA technology because it can be made of material from two different species, like mythological imagery. R-DNA technology uses palindromic sequences and leads to the production of sticky and blunt ends.
38. Epidermal cells of which part of plant often secrete a waxy water resistant layer on their outer surface?
[A] Aerial parts only
[B] Roots only
[C] Both aerial parts and roots
[D] Neither aerial parts nor roots
Show Answer
Correct Answer: A [Aerial parts only]
Notes:
The major role of epidermis is to protect all the parts of the plant. Epidermal cells on the aerial parts of the plant often secrete a waxy, water-resistant layer on their outer surface. This aids in protection against loss of water, mechanical injury and invasion by parasitic fungi.
39. Which one of the following features is absent in a virus?
[A] Presence of cell wall
[B] Reproduce within host cell
[C] Fully parasitic in nature
[D] Presence of either DNA or RNA
Show Answer
Correct Answer: A [Presence of cell wall]
Notes:
A virus has a simple structure. It has no internal cellular structure, no cell wall or cell membrane, just the protein coat that holds the string of nucleic acid. It is made only of a nucleic acid + a protein coat. A cell wall is a layer located outside the cell membrane found in plants, fungi, bacteria, algae, and archaea.
40. In male sharks, Claspers are found attached to
____:
[A] Anal fin
[B] Ventral fin
[C] Pectoral fin
[D] Pelvic fin
Show Answer
Correct Answer: D [Pelvic fin]
Notes:
Claspers are organs found in male elasmobranchs. Each male has two claspers. They are located along the inner side of the shark or ray’s pelvic fin and are used in reproduction. During mating, the male deposits his sperm into the female’s cloaca (the opening that serves as the entrance to the uterus, intestine and urinary tract) via grooves that lie in the upper side of the claspers.
