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. The plants, which grow under water stress conditions of deserts are _____:
[A] Sciophytes
[B] Heliophytes
[C] Epiphytes
[D] Xerophytes
Show Answer
Correct Answer: D [Xerophytes]
Notes:
The term xerophyte refers to a plant species that has evolved over time to adapt to dry and arid regions like deserts. Xerophytes have adapted to be able to keep extremely large amounts of water for a long period of time. Without this capability, the plant would die, as the desert region itself does not provide enough water to sustain life. They have thick cuticle, sunken stomata and leaves modified in form of spines such as in opuntia.
32. Liver is a rich source of _____:
[A] Minerals
[B] Fat soluble vitamins
[C] Proteins
[D] Sugars
Show Answer
Correct Answer: C [Proteins ]
Notes:
In general, liver is a good source of vitamin A, iron, zinc, copper and manganese, and a very good source of protein. There are twenty grams of protein in a single slice of liver.
33. The upper part of the respiratory tract is provided with small hair-l ike structures called ____:
[A] Bronchi
[B] Cilia
[C] Villi
[D] Alveoli
Show Answer
Correct Answer: B [Cilia]
Notes:
The majority of the upper respiratory epithelium is lined with cilia, small hair-like structures that move together like oars to push the mucus and its trapped contents to the throat, where it is swallowed. Each cell has about 300 cilia.
34. Which of the following trees shed their leaves once in a year?
[A] Deciduous trees
[B] Coniferous trees
[C] Evergreen trees
[D] Both deciduous and coniferous trees
Show Answer
Correct Answer: A [Deciduous trees]
Notes:
Deciduous trees and shrubs are plants that annually lose their leaves at the end of each growing season; usually during the winter, but can also occur during a dry season in warm climates. Common examples of deciduous trees include oak, maple, and hickory trees. Oak trees are characteristic deciduous trees that lose their leaves in the fall and regrow them in the spring.
35. Which of the following is the third stage in the metamorphosis of a butterfly?
[A] Egg
[B] Pupa
[C] Larva
[D] Adult
Show Answer
Correct Answer: B [Pupa]
Notes:
The butterfly and moth develop through a process called metamorphosis. All butterflies have “complete metamorphosis.” To grow into an adult they go through 4 stages: egg, larva, pupa and adult.
36. In male reproductive system, the testes are situated outside the abdominal cavity within a pouch called ____:
[A] Testicular Lobules
[B] Glands
[C] Scrotum
[D] Seminiferous Tubules
Show Answer
Correct Answer: C [Scrotum]
Notes:
A pair of testes is situated outside the abdominal cavity within a pouch called scrotum. The scrotum helps in maintaining the low temperature of the testes (2-2.5o C lower than the normal internal body temperature) necessary for spermatogenesis.
37. The gametophyte is called prothallus in _____:
[A] Pteridophyta
[B] Spermatophyta
[C] Bryophyta
[D] Thallophyta
Show Answer
Correct Answer: A [Pteridophyta]
Notes:
Prothallus is usually the gametophytic stage in the life of a fern or other pteridophyte. The prothallium develops from a germinating spore. It is a shortlived and inconspicuous heart-shaped structure.
38. Molybdenum deficiency affects the activity of _____:
[A] Nitrogenase
[B] Nitrate reductase
[C] Chlorate reductase
[D] All of the above
Show Answer
Correct Answer: B [Nitrate reductase]
Notes:
In molybdenum-deficient plants grown in the presence of nitrate, molybdenum is required for the synthesis of nitrate reductase. Molybdenum deficiency results in the decrease of free amino acids in the plants in comparison to normal plants.
39. Which type of epithelial tissue allows transportation of substances through a selective permeable surface in the lining of food vessels or lung alveoli?
[A] Simple squamous epithelium
[B] Stratified squamous epithelium
[C] Ciliated columnar epithelium
[D] Cuboidal epithelium
Show Answer
Correct Answer: A [Simple squamous epithelium]
Notes:
There are two types of squamous epithelium— simple squamous epithelium and stratified squamous epithelium. Simple squamous epithelium lines the blood vessels or alveoli in lungs. where transportation of substances occurs through selectively permeable membrane. It is made up of extremely thin and simple flat cells that form a delicate lining.
40. Scurvy is a disease which is caused due to the deficiency of vitamin _____:
[A] A
[B] B12
[C] C
[D] K
Show Answer
Correct Answer: C [C]
Notes:
Scurvy also once called ‘Sailor’s disease’ is a condition where an individual has a vitamin C (ascorbic acid) deficiency. Scurvy often presents itself initially as symptoms of malaise and lethargy, followed by formation of spots on the skin, spongy gums, and bleeding from the mucous membranes. Spots are most abundant on the thighs and legs, and a person with the ailment looks pale, feels depressed, and is partially immobilized. As scurvy advances, there can be open, suppurating wounds, loss of teeth, jaundice, fever, neuropathy and death.
