1. Which among the following cell organelles is essential for Cellular respiration?
[A] Endoplasmic Reticulum
[B] Golgi Body
[C] Mitochondrion
[D] Lysosomes
Show Answer
Correct Answer: C [Mitochondrion]
Notes:
Mitochondrion is essential for Cellular respiration. Mitochondria are also responsible for generating clusters of iron and sulphur. Iron and Sulphur are important cofactors of many enzymes.
2. Gargling with a solution of table salt is known to provide relief for a sore throat because ____ ?
[A] It kills bacteria
[B] It works as analgesic
[C] It dehydrates water from inflammatory tissues by Osmosis
[D] Placebo effect
Show Answer
Correct Answer: C [It dehydrates water from inflammatory tissues by Osmosis]
Notes:
Gargling with salt water provides relief for a sore throat primarily because it dehydrates water from inflammatory tissues through osmosis. This process reduces swelling and discomfort. Saltwater creates a hypertonic solution, drawing excess fluid out of swollen tissues, which can alleviate pain and irritation. Additionally, salt has mild antibacterial properties, but its primary benefit in this context is osmotic dehydration.
3. Human Papilloma Virus is related to which of the following diseases?
[A] Prostate Cancer
[B] Cervical Cancer
[C] Lymphatic Filariasis
[D] Leukemia
Show Answer
Correct Answer: B [Cervical Cancer]
Notes:
Human papilloma virus (HPV) is a viral infection that’s passed between people through skin-to-skin contact. There are over 100 varieties of HPV. Human Papilloma Virus is 0related to Cervical cancer.
4. Which movements of “Touch me not plant” lead to closing of its leaves when touched?
[A] Nyctinastic movements
[B] Seismonastic movements
[C] Chemonastric movements
[D] Photonastic movements
Show Answer
Correct Answer: B [Seismonastic movements]
Notes:
Seismonastic Movement is caused by the mechanical stimuli like shock, touch, fast moving wind, etc. Mimosa pudica is a perennial herb which is also known as the touch me not plant or the sensitive plant, is well-known for closing its leaves (or folding its leaves inwards) when touched.
5. Which part of the plant is used in making saffron spice?
[A] Stigma
[B] Sepal
[C] Petal
[D] Leaf
Show Answer
Correct Answer: A [Stigma]
Notes:
Stigma of the plant is used in making the saffron spices. In making the saffron spice, stigma of the plant is used. Stigma is the top of the centre part of a flower. It receives the pollen that allows it to form new seeds.
6. Which of the following is the largest invertebrate?
[A] Arthropod
[B] Echinoderm
[C] Mollusc
[D] Sponge
Show Answer
Correct Answer: C [Mollusc]
Notes:
Molluscs, such as squid, cuttlefish and octopus, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species.
7. Which of the following is the main constituent of the Gobar gas?
[A] Carbon dioxide
[B] Methane
[C] Ethylene
[D] Carbon monoxide
Show Answer
Correct Answer: B [Methane]
Notes:
Biogas or Gobar gas is produced by the breakdown of organic matter in the absence of oxygen. It can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. It is a renewable energy source. It comprises primarily methane (CH4) and carbon dioxide (CO2) and may have small amounts of hydrogen sulphide (H2S), moisture and siloxanes. It is produced by anaerobic digestion.
8. Which among the following acts as a resistance against disease in the body? (UPSC Prelims 1982)
[A] Vitamins
[B] Carbohydrates
[C] Red Corpuscles
[D] White Corpuscles
Show Answer
Correct Answer: D [White Corpuscles]
Notes:
White blood cells help you fight infection. When one gets sick, white blood cell count is higher than normal. This is because your body is releasing more of these cells to fight the infection.
9. Which of the following clearly defines Chlorophyll? (UPSC Prelims 1982)
[A] Halogen acid
[B] A green pigment found in the plants
[C] A chloro-organic compound
[D] Element
Show Answer
Correct Answer: B [A green pigment found in the plants]
Notes:
Chlorophyll is a green photosynthetic pigment found in plants, algae, and cyanobacteria. Chlorophyll absorbs mostly in the blue and to a lesser extent red portions of the electromagnetic spectrum, hence its intense green color.
10. Endoscopy, a technique used to explore the stomach or other inner parts of the body is based on the which of the following phenomenon? (UPSC Prelims 1999)
[A] Total internal reflection
[B] interference
[C] diffraction
[D] polarisation
Show Answer
Correct Answer: A [Total internal reflection]
Notes:
Endoscopy, a technique used to explore the stomach or other inner parts of the body is based on total internal reflection. The endoscopy procedure uses an endoscope to examine the interior of a hollow organ or cavity of the body. Unlike many other medical imaging techniques, endoscopes are inserted directly into the organ. There are many types of endoscopes.
