General
Which is responsible for blood clotting?
A) Lymphocytes
B) Monocyte
C) Platelets
D) Red blood cells
Platelets, also known as thrombocytes, are responsible for blood clotting. They are small cell fragments in the blood that play a crucial role in preventing excessive bleeding when a blood vessel is injured.
When damage occurs, platelets gather at the site and form a plug. They also release chemicals that trigger a cascade of reactions, leading to the formation of fibrin, a protein that stabilizes the clot.
Lymphocytes and monocytes are types of white blood cells involved in immunity, while red blood cells transport oxygen.
Thus, platelets are the correct answer. Understanding blood components is essential for studying human biology and medical conditions like hemophilia.
General
A)
17th January
B)
17th May
C)
17th June
D)
17th July
This UN day is observed on 17 June to raise awareness about desertification and drought issues worldwide.
General
A)
Warren Hastings
B)
Lord Canning
C)
Lord Wavell
D)
Lord Mountbatten
Lord Wavell was second last (penultimate) viceroy before Mountbatten.
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General
A)
Stomach
B)
Duodenum
C)
Jejunum
D)
Anus
Pancreatic enzymes are released into the duodenum where they aid digestion of carbohydrates, proteins, and fats.
General
A)
Benjamin Banneker
B)
Thomas Edison
C)
Alessandro Volta
D)
Benjamin Franklin
Benjamin Franklin, a prominent American scientist and statesman, invented both the lightning rod and bifocal spectacles. His lightning rod invention emerged from his experiments with electricity, including the famous kite experiment, which demonstrated that lightning is a form of electrical discharge.
The lightning rod protects buildings by directing electrical energy safely into the ground, preventing fires and structural damage. This invention had immediate practical importance and is still widely used today.
Franklin also invented bifocal spectacles to address his own vision problems. These glasses combine two lenses in one frame, allowing a person to see both near and distant objects clearly without switching glasses. This was a major convenience and innovation in optics.
Other options are notable scientists but unrelated to both inventions: Thomas Edison developed electric devices, Alessandro Volta invented the battery, and Benjamin Banneker was a mathematician and astronomer.
Therefore, Benjamin Franklin is the correct answer, as he contributed significantly to both electrical science and practical inventions improving daily life.
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General
Mars has two natural satellites, Phobos and Deimos. These moons were discovered in 1877 by astronomer Asaph Hall. They are small, irregularly shaped bodies, believed to be captured asteroids or formed from debris.
Phobos is the larger moon and orbits very close to Mars, completing a revolution in about 7 hours. Deimos is smaller and orbits farther away, taking about 30 hours.
Unlike Earth, which has one moon, and Mercury and Venus, which have none, Mars has two moons. This makes option B correct.
These moons are of great scientific interest because they provide clues about the formation and evolution of the solar system. Future missions may explore them further.
Thus, the correct answer is 2.
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