1. Calcitriol is the biologically active form of which among the following Vitamins?
[A] Vitamin B
[B] Vitamin C
[C] Vitamin D
[D] Vitamin E
Show Answer
Correct Answer: C [Vitamin D]
Notes:
Calcitriol is the biologically active form of Vitamin D. It is normally made in the kidney. It is used to treat diseases like hypoparathyroidism, osteoporosis, osteomalacia, and familial hypophosphatemia.
2. Which of the following bacteria forms an endosymbiotic nitrogen fixing association with roots of legumes that helps in Nitrogen Fixation?
[A] Clostridium
[B] Rhizobium
[C] Salmonella
[D] Staphylococcus
Show Answer
Correct Answer: B [Rhizobium]
Notes:
Rhizobium Found in roots of legumes, like Peas, grams, Pulses etc, where it fixes atmospheric nitrogen as ammonia, which is then converted into useful amino acid.
3. For which of the following diseases first successful vaccination was devloped (it is caused by Variola virus)?
[A] Cow pox
[B] Chicken pox
[C] Small pox
[D] Polio
Show Answer
Correct Answer: C [Small pox]
Notes:
Smallpox was an infectious disease caused by one of two virus variants, Variola major and Variola minor. the World Health Organization (WHO) certified the global eradication of the disease in 1980.
4. Why do birds not experience respiratory issues while flying at high altitudes?
[A] Their lungs are larger relative to body size
[B] They fly inactively at high altitudes
[C] None of the above is correct
[D] Birds possess additional air sacs
Show Answer
Correct Answer: D [Birds possess additional air sacs]
Notes:
Birds have unique respiratory systems with extra air sacs that provide continuous airflow and efficient oxygen exchange, even at high altitudes where air is thinner. These adaptations help birds avoid respiratory trouble during flight.
5. Which plant’s roots yield valuable medicinal alkaloids?
[A] Emblica officinalis
[B] Asparagus officinalis
[C] Helianthus annuus
[D] Rauwolfia serpentina
Show Answer
Correct Answer: D [Rauwolfia serpentina]
Notes:
Rauwolfia serpentina, also called Sarpagandha, yields reserpine, an antihypertensive alkaloid. Its roots have significant medicinal use in treating hypertension and mental disorders. The other species—Amla, Shatavari, and Sunflower—are not known for similar alkaloid content in their roots.
6. Who put forward the “Theory of Evolution”?
[A] Aristotle
[B] Charles Darwin
[C] Louis Pasteur
[D] Isaac Newton
Show Answer
Correct Answer: B [Charles Darwin]
Notes:
“Theory of Evolution” which is also referred to as the theory of “survival of the fittest”, was proposed by Charles Darwin in On the Origin of Species in 1859 and, independently, by Alfred Wallace in 1858—although Wallace, unlike Darwin, said the human soul is not the product of evolution.
7. Which of the following gave green colour to plants?
[A] Chlorophyll
[B] Sugar
[C] Mitochondria
[D] Xylem
Show Answer
Correct Answer: A [Chlorophyll]
Notes:
Chlorophyll is the primary pigment in plants. It absorbs yellow and blue wavelengths of light while reflecting green. It is the presence and relative abundance of chlorophyll that gives plants their green color.
8. Which of the following is the thermoregulatory centre of the man body?
[A] Pituitary
[B] Skin
[C] Hypothalamus
[D] Thyroid
Show Answer
Correct Answer: C [Hypothalamus]
Notes:
The thermoregulatory center in the hypothalamus controls the temperature at which the human body operates. There are two sets of thermoreceptors involved in the controlling of the body temperature.
9. Consumption of fish is considered to be healthy when compared to flesh of other animals because fish contains which of the following minerals?
[A] Polyunsaturated fatty acids
[B] saturated fatty acids
[C] essential vitamins
[D] more carbohydrates and proteins
Show Answer
Correct Answer: A [Polyunsaturated fatty acids]
Notes:
Consumption of fish is considered to be healthy when compared to flesh of other animals because fish contains polyunsaturated fatty acids. Polyunsaturated fatty acid is an anti oxidant, which helps in building of tissues.
10. Which of the following features of DNA makes in uniquely suited to store and transmit genetic information from generation to generation?
[A] Complementarity of the two stands
[B] Double helix
[C] Number of base-pairs per turn
[D] Sugar-phosphate backbone
Show Answer
Correct Answer: A [Complementarity of the two stands]
Notes:
Complementary base pairing in the DNA double helix (with its complementary DNA strands) describes the manner in which deoxyribose- nucleotides bind to each other. Essentially it means that the bases are arranged along the molecule such that the chains fit together snugly so as to be lightly secured by hydrogen bonds.
