1. Which among the following is the most important role played by Ribosome in the cells?
[A] Synthesis of RNA
[B] Synthesis of DNA
[C] Synthesis of Proteins
[D] Metabolism of Carbohydrates
Show Answer
Correct Answer: C [Synthesis of Proteins]
Notes:
The most important role played by Ribosome in the cells is the synthesis of proteins. Ribosomes are composed of special proteins and nucleic acids.
2. Artificial Kidney or blood dailyzer which is used in renal failure or Kidney disorders works on the principles of _________?
[A] Imbibition & Osmosis
[B] Plasmolysis & Osmosis
[C] Diffusion & osmosis
[D] Diffusion only
Show Answer
Correct Answer: C [Diffusion & osmosis]
Notes:
Hemodialysis is a procedure where a dialysis machine and a special filter called an artificial kidney, or a dialyzer, are used to clean your blood. It works on the principles of Diffusion & osmosis.
3. The human musculoskeletal system consists of
[A] human skeleton
[B] bones attached to other bones with joints
[C] skeletal muscle attached to the skeleton by tendons.
[D] All the above
Show Answer
Correct Answer: D [All the above]
Notes:
The human musculoskeletal system consists of human skeleton, bones attached to other bones with joints and skeletal muscle attached to the skeleton by tendons. It permits movement of the body, maintains posture and circulates blood throughout the body.
4. From which part of the Glycyrrhiza glabra plant, also known as Liquorice or Mulethi, is the extract derived?
[A] Leaves
[B] Roots
[C] Fruits
[D] Stem
Show Answer
Correct Answer: B [Roots]
Notes:
Liquorice root, or Mulethi, is a potent expectorant that has been utilized in Ayurvedic medicine since ancient times. The powdered root is used in “Jastimadhu” tooth powder. Many cough syrups incorporate Liquorice as one of their components. It is also used to treat mouth and peptic ulcers, attesting to its versatile medicinal properties. Liquorice root is well-regarded for its numerous health benefits apart from its sweet flavour.
5. How does calcium carbide ripen mangoes?
[A] It reacts with moisture and releases Ethylene
[B] It reacts with moisture and releases Acetaldehyde, which in turn releases ethylene
[C] It reacts with starch and releases Acetylene
[D] It reacts with moisture and releases Ethyne
Show Answer
Correct Answer: A [It reacts with moisture and releases Ethylene]
Notes:
For reasons of safe transportation of fruits, mangoes, bananas etc are picked before they ripen fully. Slightly green harvested mangoes are subjected to small containers of calcium carbide (CaC2) with a plastic covering. CaC2 reacts with the moisture in the air to release acetylene (or ethyne) gas as follows:
CaC2 + 2 H2O – C2H2 + Ca(OH)2
This option may give you slightest confusion if you don’t know the difference between Ethylene and Ethyne (Acetylene). Both are chemical substances produced by fruits to accelerate the normal process of fruit maturation — is a ripening hormone. Ethylene is C2H4 and has a carbon-carbon double bond. Acetylene is C2H2 and has a carbon-carbon triple bind. Acetylene contains more energy and burns hotter than ethylene. Ethylene is a gaseous compound , Acetylene is the chemical compound , which is the simplest alkyne and is also a hydrocarbon while Ethylene is the simplest alkene and classified as an unsaturated hydrocarbon. I hope you will never forget it now.
6. Saffron’ is obtained from which among the following parts of the plant?
[A] Stigma
[B] Anther
[C] Stamen
[D] Pollen
Show Answer
Correct Answer: A [Stigma]
Notes:
Saffron is a spice derived from the flower of Crocus sativus, commonly known as the “saffron crocus”. It is mainly grown in cold regions. Saffron’ is obtained from the stigma of the plant.
7. Which of the following branches of Biology is not associated with snakes ?
[A] Herpetology
[B] Ophiology
[C] Serpentology
[D] Saurology
Show Answer
Correct Answer: D [Saurology]
Notes:
All of the three –Herpetology, Ophiology and Serpentology are associated to the study of snakes.While Saurology is associated to the study of Lizards. Thus Option [D] is correct.
8. Entomology is associated with the study of which of the following?
[A] Behavior of human beings
[B] Insects
[C] The origin and history of technical and scientific terms
[D] The formation of rocks
Show Answer
Correct Answer: B [Insects]
Notes:
Entomology is the scientific study of insects, a branch of zoology. In the past the term “insect” was more vague, and historically the definition of entomology included the study of terrestrial animals in other arthropod groups or other phyla, such as arachnids, myriapods, earthworms, land snails, and slugs.
9. Photosynthesis takes place in the presence of chlorophyll and which other substance?
[A] Water
[B] Nutrients
[C] Sunlight
[D] Carbon-dioxide
Show Answer
Correct Answer: C [Sunlight]
Notes:
Photosynthesis, process by which green plants and certain other organisms use the chlorophyll and energy of sunlight to convert carbon dioxide and water into the simple sugar glucose.
10. Turmeric is obtained from which part of the plant? (UPSC Prelims 1983)
[A] Fruit
[B] Stem
[C] Root
[D] Flower
Show Answer
Correct Answer: B [Stem]
Notes:
Turmeric is the rhizome or underground stem of a ginger-like plant. It is usually available under ground, as a bright yellow, fine powder.