11. Which of the following is the largest gland in human body?
[A] Thyroid
[B] Kidney
[C] Liver
[D] Pancreas
Show Answer
Correct Answer: C [Liver]
Notes:
Liver is both the heaviest internal organ and the largest gland in the human body. Located in the right upper quadrant of the abdominal cavity, it rests just below the diaphragm, to the right of the stomach and overlies the gallbladder.
12. Nereis, Pheretima (Earthworm) and Hirudinaria (blood sucking leech) are examples of which Phylum?
[A] Aschelminthes
[B] Coelenterata
[C] Arthropoda
[D] Annelida
Show Answer
Correct Answer: D [Annelida]
Notes:
The annelids (Annelida, from Latin anellus, “little ring”), also known as the ringed worms or segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches.
13. RBCs are formed in which of the following in the adults?
[A] black bone marrow
[B] white bone marrow
[C] red bone marrow
[D] blue bone marrow
Show Answer
Correct Answer: C [red bone marrow]
Notes:
There are two types of bone marrow: red marrow (also known as myeloid tissue) and yellow marrow. Red blood cells, platelets and most white blood cells arise in red marrow; some white blood cells develop in yellow marrow.
14. How many vocal cords are there in the human voice box?
[A] one
[B] Three
[C] Two
[D] Four
Show Answer
Correct Answer: C [Two]
Notes:
The vocal cords (also called vocal folds) are 2 bands of smooth muscle tissue found in the voice box (larynx). The larynx is set in the neck at the top of the windpipe (trachea). The vocal cords vibrate and air passes through the cords from the lungs to make the sound of your voice.
15. Which among the following is more required by the Growing children?
[A] Proteins
[B] Carbohydrates
[C] Vitamins
[D] All of these
Show Answer
Correct Answer: A [Proteins]
Notes:
Growing kids need protein to help them build and repair cells, enzymes, and hormones, and, as a last resort, to provide energy. Protein foods also help form new blood cells and body tissues, and they help the nervous system function properly.
16. Why do the tropical deciduous trees shed their leaves in summer? (UPSC Prelims 1983)
[A] Leaves get dried up due to the excessive heat
[B] To prevent excessive loss of water through transpiration
[C] Because rainfall is inadequate
[D] Days are longer
Show Answer
Correct Answer: B [To prevent excessive loss of water through transpiration]
Notes:
Tropical deciduous forests shed their leaves for about six to eight weeks in summer. As this is a hot-dry season, the leaves get dry due to high temperature and deficiency of moisture causing these trees to shed their leaves.
17. The bats are able to fly in dark since their wings produce which of the following waves? (UPSC Prelims 1992)
[A] Infrared rays
[B] Ultrasonic waves
[C] Sound waves
[D] Ultraviolet rays
Show Answer
Correct Answer: B [Ultrasonic waves]
Notes:
Bats can fly in dark because they. Bat echolocation is very much similar to a SONAR and is a perceptual system where ultrasonic sounds are emitted specifically to produce echoes.
18. Which one of the following is not an essential micronutrient for plants? (UPSC Prelims 1996)
[A] Boron
[B] Zinc
[C] Sodium
[D] Copper
Show Answer
Correct Answer: C [Sodium]
Notes:
There are 13 essential nutrients required by plants for its healthy and proper growth. Now these nutrients are divided into two categories:
Macronutrients (nitrogen, phosphorus, potassium, calcium, magnesium and sulphur)
Micronutrients (iron, copper, manganese, zinc, boron, molybdenum and chlorine)
Additional mineral nutrient elements which are beneficial but not necessary are sodium, cobalt, vanadium, nickel, solenium, aluminium and silicon. Thus boron, zinc and copper falls into category of essential micronutrients while sodium does not.
19. Which among the following is not a part of Vitamin B complex?
[A] Vitamin B2
[B] Vitamin B4
[C] Vitamin B6
[D] Vitamin B12
Show Answer
Correct Answer: B [Vitamin B4]
Notes:
Vitamin B complex consists of 8 vitamins namely B1(Thiamine), B2(Riboflavin), B3(Niacin), B5(Pantothenic acid), B6(Pyridoxine), B7(Biotin), B9(Folate/Folic acid) and B12(Cobalamin).
20. What are the major types of cytoskeleton filaments?
[A] Actin filaments
[B] microtubules
[C] Intermediate filaments
[D] All of them
Show Answer
Correct Answer: D [All of them]
Notes:
Three major types of filaments make up the cytoskeleton: actin filaments, microtubules, and intermediate filaments.
