General Science Questions (MCQs) for Competitive Examinations

Notes:
All citrus fruits (orange, grapefruit, lime, and lemon) are excellent sources of vitamin C. Oranges contain the most vitamin C per gram. Lemons are regarded by most nutritionists as containing the second- highest amount of vitamin C per gram of fruit. Lemons contain about 40 milligrams of vitamin C per 100 grams of flesh.

Notes:
Tusks are elongated, continuously growing front teeth, usually but not always in pairs, that protrude well beyond the mouth of certain mammal species. They are most commonly canines, as with warthogs, pig, and walruses, or, in the case of elephants, elongated incisors. The tusks are actually upper incisors, not canines. They are the only incisors the elephant has. Elephants, mastodons, and mammoths all have upper incisor teeth that emerge from the skull as tusks.

Notes:
Lactic acid is a compound produced when glucose is broken down and oxidized. During intense exercise when oxygen levels are lower, more lactic acid is produced. In animals, L-lactate is constantly produced from pyruvate via the enzyme lactate dehydrogenase (LDH) in a process of fermentation during normal metabolism and exercise.

Notes:
Organisms referred to by the term “amoeba” belong to the Domain Eukarya, Kingdom Protista, Subkingdom Protozoa, which almost exclusively includes single-celled eukaryotes that get nutrition from other organisms. Amoebas belong to the class Sarcodina, which has as its principle-distinguishing feature the presence of pseudopodia. The Protista kingdom is made up of single-celled eukaryotic organisms that are neither plant, animal, bacteria, nor fungus.

Notes:
Battery acid is sulphuric acid that has been diluted with water to attain a 37% concentration level. This particular type of acid is used in sealed lead acid batteries, however, concentration levels differentiate with some brands. These batteries use a combination of lead plates and an electrolyte consisting of a diluted sulphuric acid to convert electrical energy into potential chemical energy and back again.

Notes:
Tropism is a growth movement whose direction is determined by the direction from which the stimulus strikes the plant. Most stems are positively phototropic, while most roots are said to be negatively phototropic and positively geotropic.

Notes:
Damping off is a horticultural disease or condition, caused by a number of different pathogens that kill or weaken seeds or seedlings before or after they germinate. Pythium, a genus of parasitic oomycete, are most often responsible for damping-off. Along with Rhizoctonia solani, attacks by Pythium are most associated with producing roughly circular patches of dead seedlings.

Notes:
The liver produces urea and other waste materials and then it pours it all in the right ventricle of the heart for oxygenation. The heart then distributes the blood to various parts of the body. So the impure blood brought by the Hepatic Vein and other blood vessels gets distributed through the aorta. This clearly indicates that hepatic vein from kidneys carries the largest amount of urea, while the renal vein from kidneys carries the least.

Notes:
Bonsai is the art of aesthetic miniaturization of trees and plants in containers. A bonsai plant is not a dwarf plant but equal to the full sized flowering plant. The main objective of bonsai plants is to create a tree or plant, and even landscapes, in miniature at household level.

Notes:
The spleen is not an endocrine gland. This is because the spleen is not capable of aiding in the regulation of the hormone levels in the human body.