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With reference to Eutrophication, which of the following statements is/are correct?
Eutrophication:Eutrophication is a process when a body of water becomes overly enriched with minerals and nutrients that cause excessive growth of plants and algae. Hence, statement 1 is correct.The process results in oxygen depletion of the water body. Hence, the statement is 2 correct. EutrophicatRead more
Eutrophication:
Eutrophication is a process when a body of water becomes overly enriched with minerals and nutrients that cause excessive growth of plants and algae.
Hence, statement 1 is correct.
The process results in oxygen depletion of the water body.
Hence, the statement is 2 correct.
Eutrophication leads to algal bloom
The eutrophic water body is a body of water rich in nutrients and so supporting a dense plant population, the decomposition of which kills animal life by depriving it of oxygen.
Phytoplankton which contains algae and blue-green bacteria thrive on the excess nutrients and their population explosion covers almost the entire surface layer such a condition is known as an algal bloom.
Effects of Eutrophication:
- Loss of freshwater lakes.
- New species invasion
- Loss of coral reefs
- Toxicity
See lessWith reference to Eutrophication, which of the following statements is/are correct?
(c) Both 1 and 2
(c) Both 1 and 2
See lessThe environment modified by human activities is called :
[UPPSC 2019]
The environment modified by human activities is called an Anthropogenic environment.
The environment modified by human activities is called an Anthropogenic environment.
See lessTulsi plant has medicinal values due to the presence of the following:
[UPPSC 2019]
The correct answer is Phenols and Flavonoids. Tulsi plant has medicinal values due to the presence of the following Phenols and Flavonoids. Key Points The scientific name of Tulsi is Ocimum sanctum. It belongs to the family of Lamiaceae. Due to the presence of compounds like camphene, eugenol, and cRead more
The correct answer is Phenols and Flavonoids.
Tulsi plant has medicinal values due to the presence of the following Phenols and Flavonoids.
Key Points
The scientific name of Tulsi is Ocimum sanctum.
It belongs to the family of Lamiaceae.
Due to the presence of compounds like camphene, eugenol, and cineole, tulsi cures viral, bacterial, and fungal infections of the respiratory system.
It can cure various respiratory disorders like bronchitis & tuberculosis.
Tulsi’s active ingredients show anti-inflammatory properties and also play a role in the modulation of both cellular and humoral immunity.
See lessWhich one of the following is NOT correctly matched?
[UPPSC 2019]
The correct answer is Silver bromide - artificial photosynthesis. Silver bromide is used in the manufacture of photographic emulsions. Key Points AgBr is the chemical formula for Silver bromide. It is extremely sensitive to light. When exposed to light, silver bromide decomposesRead more
The correct answer is Silver bromide – artificial photosynthesis.
Silver bromide is used in the manufacture of photographic emulsions.
Key Points
AgBr is the chemical formula for Silver bromide. It is extremely sensitive to light.
When exposed to light, silver bromide decomposes and later it preserves a photographic image.
Additional Information
Artificial photosynthesis is also known as Photocatalysis.
This process replicates natural photosynthesis to reduce anthropogenic carbon dioxide (CO2), increase fuel security, and provide a sustainable global economy.
Silver iodide is used to create artificial rain.
Lithium bicarbonate is used in the treatment of rheumatism.
Its formula is LiHCO3.
Rheumatism might increase the incidence of bipolar disorder development.
Milk of magnesia is used as an antacid.
Its formula is Mg(OH)2.
See lessWhich one of the following materials contains calcium ?
[UPPSC 2019]
The correct answer is Gypsum. Gypsum contains calcium. Key Points Gypsum is chemically known as calcium sulfate dihydrate is a compound of calcium. Its formula is CaSO4. 2H2O. It has about 29.4 percent calcium in the anhydrite form and 23.3 percent in the hydrous form. Uses of Gypsum: It is used asRead more
The correct answer is Gypsum.
Gypsum contains calcium.
Key Points
Gypsum is chemically known as calcium sulfate dihydrate is a compound of calcium.
Its formula is CaSO4. 2H2O.
It has about 29.4 percent calcium in the anhydrite form and 23.3 percent in the hydrous form.
Uses of Gypsum:
It is used as a fertilizer in the soils for plant growth.
it is also used in making chalks, plasters boards, etc.
Additional Information
China Clay:
Kaolinite is also known as China clay.
Kaolin is named after a hill in China (Kao-ling).
It’s chemical composition Al₂Si₂O₅(OH)₄.
It is used in the making of paper, paint, rubber.
Corundum:
Corundum is an aluminum oxide with a chemical composition of Al2O3 and a hexagonal crystal structure.
It is widely known for its extreme hardness.
Corundum is used to make industrial bearings, scratch-resistant windows for electronic instruments, circuit boards.
Talc:
Talc is a clay mineral formed with hydrated magnesium silicate.
The chemical formula is Mg₃Si₄O₁₀(OH)₂.
A form of talc is also known as “soapstone”.
See lessWhich of the following glands in human body acts both as a endocrine gland as well as an exocrine gland?
[UPPSC 2019]
The correct answer is Pancreas. The pancreas acts both as an endocrine gland as well as an exocrine gland. Key Points This is the second-largest gland of the human body. Exocrine glands:Glands which have duct are called exocrine glands. Secretion of enzymes passes through it. Example: Lactic gland,Read more
The correct answer is Pancreas.
The pancreas acts both as an endocrine gland as well as an exocrine gland.
Key Points
This is the second-largest gland of the human body.
Exocrine glands:
Glands which have duct are called exocrine glands.
Secretion of enzymes passes through it.
Example: Lactic gland, Sweat gland.
Endocrine glands:
These are ductless glands. Hormones are secreted by these glands.
Hormones are sent to the different parts of the body through blood plasma.
Example: Pituitary gland, Thyroid gland.
Additional Information
Pancreatic juice from the pancreas combines with food.
It contains three types of enzymes:
Trypsin: It converts the protein and peptone into polypeptides and amino acids.
Amylase: It converts the starch into soluble sugar.
Lipase: It converts the emulsified fats into glycerol and fatty acids.
See lessA liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by :
[UPPSC 2019]
The correct answer is Both (a) and (b). A liquid remains hot or cold for a long time in a thermos flask because there is no loss or gain of heat by Conduction, Convection and radiation. Key Points The thermos flask consists of a double-walled glass vessel resting on a cork inside a metal or plasticRead more
The correct answer is Both (a) and (b).
A liquid remains hot or cold for a long time in a thermos flask because there is no loss or gain of heat by Conduction, Convection and radiation.
Key Points
The thermos flask consists of a double-walled glass vessel resting on a cork inside a metal or plastic case.
The insulating stopper or cork at the top minimizes heat loss by convection.
The outer surface of its inner wall and the inner surface of its outer wall are silvered which prevents heat transfer due to radiation.
The double-walled glass vessel and vacuum prevents heat loss by conduction.
The thermos flask was invented by Sir James Dewar in 1892.
Additional Information
Conduction:
In this process, heat is transferred from one place to another place by the successive vibrations of the particles of the medium without bodily movement of the particles of the medium.
In solids, heat transfer takes place by conduction.
Convection:
In this process, heat is transferred by the actual movement of particles from one place to another place.
Due to the movement of particles, a current of particles sets up, which is called a convection current.
Radiation:
See lessIn this method, the transfer of heat takes place with the speed of light without affecting the intervening medium.
Which of the following pairs is NOT correctly matched?
[UPPSC 2019]
Rayon is a modified fiber. Rayon is an artificial textile material composed of regenerated and purified cellulose which is derived from plant sources. It was developed in the late 19th century as a substitute for silk.Rayon is the first man-made fiber. Additional Information Oxytocin is a hormone thRead more
Rayon is a modified fiber.
Rayon is an artificial textile material composed of regenerated and purified cellulose which is derived from plant sources.
It was developed in the late 19th century as a substitute for silk.
Rayon is the first man-made fiber.
Additional Information
Oxytocin is a hormone that acts as a neurotransmitter.
In females, it triggers labor and the release of breastmilk.
In males, oxytocin helps move sperm.
Aspartame is an artificial non-saccharide sweetener that is 200 times sweeter than sucrose.
It is commonly used as a sugar substitute in foods and beverages.
Neoprene is produced by the polymerization of chloroprene.
It was the first successful synthetic rubber created in 1930.
See lessWhat happens when some charge is placed on a soap bubble ?
[UPPSC 2019]
What happens when some charge is placed on a soap bubble its radius increases. Key Points The radius of the bubble will expand because the charged particles uniformly distributed on it causes them to repel each other due to the electrostatic force. The phenomenon takes place in both positive and negRead more
What happens when some charge is placed on a soap bubble its radius increases.
Key Points
The radius of the bubble will expand because the charged particles uniformly distributed on it causes them to repel each other due to the electrostatic force.
The phenomenon takes place in both positive and negatively charged bubbles because of the charge on it.
See less