GK INFOPEDIA

[1] Generally insects respire through – A. Skin B. Gill C. Lung D. Spiracle Ans: Spiracle Explanation : Air enters the respiratory systems of insects through a series of external openings called spiracles. These external openings, which act as muscular valves in some insects, lead to the internal respiratory system, a densely networked array of […]

[1] Bacterial diseases are found in – A. plants B. animals C. humans D. All of the above Ans: All of the above Explanation : Most bacteria that are associated with plants are actually saprotrophic, and do no harm to the plant itself. However, a small number, around 100 known species, are able to cause […]

[1] The carbon dioxide content in the air that we exhale is about – A. 0.04 B. 0.08 C. 0.12 D. 0.16 Ans: 0.04 Explanation : Carbon dioxide exists in Earth’s atmosphere in this state, as a trace gas at a concentration of 0.039 per cent by volume. The air we breathe in contains about […]

[1] The process of preventing the birds from flying is called – A. brailing B. debeaking C. dubbing D. pecking Ans: brailing Explanation : Brailing is the practice of preventing a bird from flying by tying the wing so that it is impossible for the bird to open it fully. The brail is a clear […]

[1] Transcription means the synthesis of – A. Lipids B. Protein C. DNA D. RNA Ans: DNA Explanation : Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA by the enzyme, RNA polymerase. During transcription, a DNA sequence is read by an RNA polymerase, which […]

[1] Which is the sensory receptor involved in detecting blood pressure? A. Chemoreceptor B. Mechanoreceptor C. Photoreceptor D. Magnetoreceptor Ans: Mechanoreceptor Explanation : Baroreceptors are sensors located in the blood vessels of all vertebrate animals that sense the blood pressure and relay the information to the brain, so that a proper blood pressure can be […]

[1] Kidney disease in man is caused by the pollutant – A. Cadmium B. Iron C. Cobalt D. Carbon Ans: Cadmium Explanation : Cadmium (Cd), a by-product of zinc production, is one of the most toxic elements to which man can be exposed at work or in the environment. Once absorbed, Cd is efficiently retained […]

[1] Which of these fruits develop from an inflorescence? A. Apple B. Guava C. Pineapple D. Grape Ans: Pineapple Explanation : Pineapple is a perennial monocotyledonous plant having a terminal inflorescence and a terminal multiple fruit. The vegetative meristem produces leaves which becomes and inflorescence meristem. The Pineapple inflorescence contains many small flowers. Each flower […]

[1] If waste materials contaminate the source of drinking water, which of the following diseases will spread? A. Scurvy B. Typhoid C. Malaria D. Anaemia Ans: Typhoid Explanation : Typhoid is a systemic infection caused by Salmonella Typhi, usually through ingestion of contaminated food or water. Typhoid is spread by eating or drinking food or […]

[1] The largest cell in the human body is : A. blood cell B. sperm cell C. Ovum D. RBC Ans: Ovum Explanation : The ovum is the largest cell in the human body, typically visible to the naked eye without the aid of a microscope or other magnification device. The smallest is the male […]