11. Who among the following devised the Technique IVF(In vitro Fertilization)?
[A] Robert Edwards
[B] Dr. Martin Cooper
[C] Edward Jenner
[D] Sir Frank Whittle
Show Answer
Correct Answer: A [Robert Edwards]
Notes:
The early influences on Robert Edwards’ approach to the scientific research that led to human IVF are described. He founded the first IVF programme for infertile patients and trained other scientists in their techniques.
12. Which of the following is the reason behind bleeding through nose in high mountain regions?
[A] The pressure of the blood capillaries is higher than the outside pressure
[B] The pressure at high altitudes is greater than that in the plains
[C] The blood pressure increases at high altitudes
[D] The blood pressure decreases at high altitudes
Show Answer
Correct Answer: A [The pressure of the blood capillaries is higher than the outside pressure]
Notes:
As altitude increases, the availability of oxygen decreases, making the air thinner and drier. Dry climates can cause drying and cracking inside the nose, which can lead to a nosebleed. The climate inside nose gets drier. This makes the blood vessels exposed inside your nose more likely to burst there than at lower altitudes.
13. At which of the following stages the sex of the offspring is determined?
[A] The conception takes place
[B] The sperm fertilises the ovum
[C] The embryo is partially developed
[D] The end of gestation period is near
Show Answer
Correct Answer: A [The conception takes place]
Notes:
Biological sex is determined by a pair of sex chromosomes: XY in males and XX in females. Genes on the X chromosome are said to be X-linked. X-linked genes have distinctive inheritance patterns because they are present in different numbers in females (XX) and males (XY).Thus usually occurs as soon as conception takes place.
14. Which of the following is the ready source of energy available for athletes?
[A] Vitamins
[B] Fats
[C] Proteins
[D] Carbohydrates
Show Answer
Correct Answer: D [Carbohydrates]
Notes:
Carbohydrates are the ready source fo energy for the athletes. Carbohydrates improve athletic performance by delaying fatigue and allowing an athlete to compete at higher levels longer nutrients such as fat or muscle protein are utilized to make energy.
15. Genetic code is made up by the four-letter alphabet forming the pairs?
[A] A—C, C—A, T—G, G—T
[B] A—G, G—A, C—A, T—C
[C] T—G, G—T, A—C, C—A
[D] A—T, T—A, C—G, G—C
Show Answer
Correct Answer: D [A—T, T—A, C—G, G—C]
Notes:
The four letters designating these bases (A, G, C, and T) are the alphabet of the genetic code. Each rung of the DNA molecule is contains a combination of two of these letters, one jutting out from each side. In this genetic code, A always combines with T, and C with G to make what is called a base pair.
16. Which vitamin is also called as retinol?
[A] Vitamin A
[B] Vitamin C
[C] Vitamin D
[D] Vitamin K
Show Answer
Correct Answer: A [Vitamin A]
Notes:
Vitamin A is also called as retinol deficiency of which results in xeropthalmia. Chemical formula for Vitamin A is C20H30O.
17. Germplasm theory was given by which of the following biologists?
[A] August Weismann
[B] Georges Cuvier
[C] Arthur Tansley
[D] None of these
Show Answer
Correct Answer: A [August Weismann]
Notes:
Germ-plasm theory, the concept of the physical basis of heredity, articulated by the 19th century biologist August Weismann.
18. What is another name for Koshland’s theory of enzyme action?
[A] Reduced fit theory
[B] Induced fit theory
[C] Enzyme coenzyme theory
[D] Lock and key theory
Show Answer
Correct Answer: B [Induced fit theory]
Notes:
Induced fit theory is also known as Koshland’s theory of enzyme action. It describes the enzyme-substrate interaction.
19. __ tissues upsurge the length of the plant.
[A] Lateral meristem
[B] Apical meristem
[C] Intercalary meristem
[D] All of the above
Show Answer
Correct Answer: B [Apical meristem]
Notes:
Apical meristem tissues upsurge the length of the plant. It is existent at the growing tips or apical of stems and roots.
20. On which of the following factor rates of photosynthesis depends?
[A] pH
[B] Pressure
[C] Intensity of Light
[D] Amount of reactance
Show Answer
Correct Answer: C [Intensity of Light]
Notes:
The rate of photosynthesis mainly depends on the Intensity of Light, carbon dioxide concentration, and temperature.
