31. Which of the following are erythrocytes?
[A] White blood cells
[B] Red blood cells
[C] Platelets
[D] All of the above
Show Answer
Correct Answer: B [Red blood cells]
Notes:
Red blood cells are erythrocytes. RBCs are hermaphrodite cells and in humans without a nucleus. RBCs contain an iron-rich protein called haemoglobin.
32. The elastic tissue which connects the cauda epididymis to the scrotal sac is called __.
[A] Caput epididymis
[B] Scrotal ligament
[C] Gubernaculum
[D] Tendinous cord
Show Answer
Correct Answer: C [Gubernaculum]
Notes:
Connects the lower pole of the gonad and epididymis to the future inguinal canal is called the Gubernaculum.
33. What contagious skin condition leaves small circular patches of bare skin?
[A] Ringworm
[B] Thrush
[C] Round worm
[D] Psoriasis
Show Answer
Correct Answer: A [Ringworm]
Notes:
Ringworm of the body is a fungal infection that can cause an itchy, circular rash.
34. What is Cystic Fibrosis?
[A] Sex-linked recessive disorder
[B] Autosomal dominant disorder
[C] Autosomal recessive disorder
[D] Sex-linked dominant disorder
Show Answer
Correct Answer: C [Autosomal recessive disorder]
Notes:
Cystic Fibrosis is an Autosomal recessive disorder that causes severe damage to the lungs, digestive system, and other organs in the body
35. A process where new combinations of alleles are formed is called?
[A] Genetic Drift
[B] Mutation
[C] Genetic Recombination
[D] Natural selection
Show Answer
Correct Answer: C [Genetic Recombination]
Notes:
A process where new combinations of alleles are formed is called Genetic Recombination.
36. The biofertilizer present in the roots of legumes is __
[A] Anabaena
[B] Rhizobium
[C] Azospirillum
[D] All of the above
Show Answer
Correct Answer: B [Rhizobium]
Notes:
Rhizobium leguminocerium bacteria live symbiotically in the root nodules of legumes and some non-legumes. They fix atmospheric N2 and hence increase soil fertility.
37. Which of the following plants are used as green manure in crop fields and sandy soils?
[A] Dicanthium annulatum and Azolla pinnata
[B] Crotalaria junecea and Alhagi camelorum
[C] Calotropis procera and Pitylanthus niruri
[D] Saccharum munja and Lantana camara
Show Answer
Correct Answer: B [Crotalaria junecea and Alhagi camelorum]
Notes:
Crotalaria junecea and Alhagi camelorum plants are used as green manure in crop fields and sandy soils. The specific plant or crop varieties that are grown and turned into the soil, thereby improving its overall quality, is called green manure.
38. Which of the following can use molecular nitrogen as a nutrient?
[A] Methanomonas
[B] Mucor
[C] Rhizobium
[D] Spirogyra
Show Answer
Correct Answer: C [Rhizobium]
Notes:
Rhizobium is used molecular nitrogen as a nutrient. It is one of the vital symbiotic nitrogen-fixing bacteria.
39. What is Southern blotting?
[A] Attachment of probes to DNA fragments
[B] Transfer of DNA fragments from electrophoretic gel to a nitrocellulose sheet
[C] Comparison of DNA fragments to two sources
[D] Transfer of DNA fragments to electrophoretic gel from cellulose membrane
Show Answer
Correct Answer: B [Transfer of DNA fragments from electrophoretic gel to a nitrocellulose sheet]
Notes:
Southern blotting is the transfer of DNA fragments from electrophoretic gel to a nitrocellulose sheet.
40. Blood pressure is measured by ____:
[A] Hydrometer
[B] Thermometer
[C] Sphygmanometer
[D] Barometer
Show Answer
Correct Answer: C [Sphygmanometer]
Notes:
Sphygmomanometer an instrument for measuring blood pressure. It typically consists of an inflatable rubber cuff which is applied to the arm and connected to a column of mercury next to a graduated scale, enabling the determination of systolic and diastolic blood pressure by increasing and gradually releasing the pressure in the cuff. The sphygmomanometer was invented by Samuel Siegfried Karl Ritter von Basch in 1881.
