General Science Questions (MCQs) for Competitive Examinations
General Science Multiple choice questions for GK paper in SSC, NDA, CDS, UPSC, UPPSC and State PSC Examinations. These questions are part of GKToday’s 35000+ MCQs Bank Course in GKToday Android App
31. Yellow spots on citrus leaves is due to the deficiency of _____:
[A] Zinc
[B] Iron
[C] Boron
[D] Magnesium
Show Answer
Correct Answer: D [Magnesium]
Notes:
The deficiency of magnesium leads to yellowish green blotch near the base of the leaf between the midrib and the outer edge (chlorosis). The yellow area enlarges until the only green remaining is at the tip and base of the leaf as an inverted V-shaped area on the midrib.
32. The name of the longest muscle in human body is _____:
[A] Sartorius muscle
[B] Massete muscle
[C] Stapedius muscle
[D] Gluteus Maximus muscle
Show Answer
Correct Answer: A [Sartorius muscle]
Notes:
The Sartorius muscle is the longest muscle in the human body. It is a long, thin, superficial muscle that runs down the length of the thigh in the anterior compartment. Its upper portion forms the lateral border of the femoral triangle.
33. Which organ is the alternate term for womb?
[A] Uterus
[B] Ureter
[C] Vagina
[D] Vulva
Show Answer
Correct Answer: A [Uterus]
Notes:
The uterus or womb is a major female hormone responsive reproductive sex organ of most mammals including humans. It is within the uterus that the fetus develops during gestation, usually developing completely in placental mammals such as humans and partially in marsupials such as kangaroos and opossums.
34. Opium is a plant product obtained from _____:
[A] Dried leaves
[B] Dried latex
[C] Stem bark
[D] Roots
Show Answer
Correct Answer: B [Dried latex]
Notes:
Opium is the dried latex obtained from the opium poppy. Opium contains approximately 12% morphine, an alkaloid, which is frequently processed chemically to produce heroin for the illegal drug trade. The latex also includes codeine and non-narcotic alkaloids such as papaverine, thebaine and noscapine.
35. According to World Wide Fund, which of the following river of India is one of the ten most endangered rivers in the world?
[A] River Jamuna
[B] River Ganges
[C] River Brahamputra
[D] River Godavari
Show Answer
Correct Answer: B [River Ganges]
Notes:
As per the report of WWF the ten most endangered rivers emerge as: the Salween, La Plata, Danube, Rio Grande, Ganges, Murray-Darling, Indus, Nile, Yangtze and Mekong.
36. Yeast is an important source of _____:
[A] Invertase
[B] Vitamin B
[C] Vitamin C
[D] Protein
Show Answer
Correct Answer: B [Vitamin B]
Notes:
Yeast is an important source of most B vitamins (except B12) and folate and contains potassium and magnesium. It is used in the preparation of vitamin B complex tablets. Therefore, seeds have been classified as endospermic with endosperm and nonendospermis without endosperm.
37. Pollination by birds is called ______:
[A] Anemophily
[B] Ornithophily
[C] Entomophily
[D] Autogamy
Show Answer
Correct Answer: B [Ornithophily]
Notes:
Ornithophily refers to the pollination of flowering plants by birds. Birds involved in ornithophily tend to be specialist nectarivores with brushy tongues and long bills, that are either capable of hovering flight or light enough to perch on the flower structures.
38. Which vitamin is made at a higher rate in our body?
[A] Vitamin A
[B] Vitamin B
[C] Vitamin C
[D] Vitamin D
Show Answer
Correct Answer: D [Vitamin D]
Notes:
Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and multiple other biological effects. It is usually produced in the skin of human and animals under the influence of solar or ultraviolet radiation. In plants it can be produced from provitamin ergosterol.
39. Inhibition of photosynthesis in the presence of O2 in C3 plants is called ____:
[A] Hexose monophosphate shunt
[B] Pasteur effect
[C] Decker effect
[D] Warburg effect
Show Answer
Correct Answer: D [Warburg effect]
Notes:
An increase in the oxygen concentration in many plants results in a decrease in the rate of photosynthesis. This phenomenon of the inhibition of photosynthesis by O2 was first discovered by a German biochemist Warburg in 1920 in Chorella (a green alga) and is called Warburg effect. O2 causes greatest inhibition of photosynthesis when CO2 levels are low and light levels are saturating. This effect is known to occur in C3 plants (Soybean) and C4 plants (Sorghum, Maize, Sugarcane), etc.
40. Some of the ingredients required for bread making are _____:
[A] Maida and Baking Powder
[B] Maida and Ghee
[C] Maida and Baking Soda
[D] Maida and Yeast
Show Answer
Correct Answer: D [Maida and Yeast]
Notes:
Salt, fat and leavening agents such as yeast and baking soda are common ingredients, though bread may contain other ingredients also. Yeast plays an important role in bread-making. It ferments and grows when combined with “food” such as flour and/ or sugar, and warmed. Carbon dioxide is produced and trapped in the dough as tiny air bubbles which make the bread rise during cooking and give it its characteristic texture.
