1. Which of the following correctly defines “Mother-of-pearl”?
[A] An oyster which yields the pearl
[B] A special large sized pearl found in Japan
[C] A hard iridescent substance forming the inner layer of certain shells
[D] Female individuals of certain species of shelled mollusk
Show Answer
Correct Answer: C [ A hard iridescent substance forming the inner layer of certain shells ]
Notes:
Nacre also known as mother of pearl, is an organic-inorganic composite material produced by some mollusks as an inner shell layer; it is also what makes up the outer coating of pearls. It is strong, resilient, and iridescent.
2. Which among the following is correct ?
[A] Caffeine which is a diuretic is a constituent of coffee but not found in tea
[B] Vitamin C which is also called ascorbic acid can be replaced with citric acid in our food
[C] Citric acid is used in Cola drinks
[D] All are wrong statements
Show Answer
Correct Answer: B [Vitamin C which is also called ascorbic acid can be replaced with citric acid in our food]
Notes:
Vitamin C which is also called ascorbic acid can be replaced with citric acid. Vitamin C is a water-soluble vitamin which is found in many foods, particularly fruits and vegetables. It is a potent antioxidant, and has a positive effects on skin health and immune function.
3. Which among the following is essential gene material ?
[A] Protein
[B] Fat
[C] DNA
[D] RNA
Show Answer
Correct Answer: C [DNA]
Notes:
The correct answer is DNA. DNA (deoxyribonucleic acid) is the essential genetic material in most living organisms, encoding the instructions for development, functioning, growth, and reproduction. It is composed of nucleotides and forms a double helix structure. RNA (ribonucleic acid) plays a crucial role in protein synthesis and can also serve as genetic material in some viruses, but DNA is the primary carrier of genetic information in cells.
4. What is the number of the Chromosomes affected by Turner syndrome?
[A] 44
[B] 45
[C] 46
[D] 47
Show Answer
Correct Answer: B [45]
Notes:
Chromosomes number 45 is affected by Turner syndrome. Turner syndrome is a condition which affects only females. It results when one of the X chromosomes (sex chromosomes) is missing or partially missing.
5. Late Hargobind Khorana had received Nobel Prize in physiology in 1968, for work on which among the following?
[A] Mechanisms of the action of hormones
[B] Chemical Structure of antibodies
[C] Interpretation of the genetic code
[D] Structural and functional organization of the cell
Show Answer
Correct Answer: C [Interpretation of the genetic code]
Notes:
Late Hargobind Khorana had received Nobel Prize in physiology in 1968, for work on interpretation of the genetic code. Har Gobind Khorana was an Indian American biochemist.
6. The ancestors of land plants were most likely similar to modern__:
[A] Conifers
[B] Ferns
[C] Green Algae
[D] Flowering Plants
Show Answer
Correct Answer: C [ Green Algae]
Notes:
The ancestor of the modern multicellular plant is the green algae, Chlorophyta.
7. Which one of the following is responsible for maintenance of osmotic pressure in blood?
[A] Fibrinogen
[B] Red Blood Cells
[C] Albumin
[D] Platelets
Show Answer
Correct Answer: C [ Albumin]
Notes:Albumin is a protein found in the blood plasma, and it plays a crucial role in regulating osmotic pressure. It helps to maintain the balance of fluids between the blood vessels and the surrounding tissues. Albumin exerts an osmotic pressure that prevents the excessive loss of fluid from the blood vessels into the tissues.
Fibrinogen, Red Blood Cells, and Platelets have different functions in the blood, but they are not primarily responsible for maintaining osmotic pressure. Fibrinogen is involved in blood clotting, Red Blood Cells are responsible for carrying oxygen, and Platelets play a role in blood clotting as well.
8. Which of the following type of Kidneys is found in an adult frog?
[A] Pronephric
[B] Metanephric
[C] Mesonephric
[D] None of these
Show Answer
Correct Answer: C [ Mesonephric ]
Notes:
Mesonephros is permanent kidney of frog and most fish, developing posterior to and replacing the pronephros of the embryonic and larval stages. It is a paired organ consisting of a set of nephrons having capsules that filter blood from the glomerulus and tubules whose cells reabsorb water and nutrients and secrete nitrogenous wastes.
9. In how many parts is the human brain divided?
[A] 2
[B] 4
[C] 3
[D] 5
Show Answer
Correct Answer: C [3]
Notes:
The brain has three main parts: the cerebrum, cerebellum and brainstem. Cerebrum: is the largest part of the brain and is composed of right and left hemispheres.
10. Which of the following is the main constituent of the Gobar gas?
[A] Carbon dioxide
[B] Methane
[C] Ethylene
[D] Carbon monoxide
Show Answer
Correct Answer: B [Methane]
Notes:
Biogas or Gobar gas is produced by the breakdown of organic matter in the absence of oxygen. It can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. It is a renewable energy source. It comprises primarily methane (CH4) and carbon dioxide (CO2) and may have small amounts of hydrogen sulphide (H2S), moisture and siloxanes. It is produced by anaerobic digestion.
