Biology MCQs

Notes:
Blood Pressure is expressed in two numbers. The higher number is known as Systolic Pressure, or the amount of force (as measured in millimetres of mercury) that is exerted against the artery walls during a heartbeat (contraction). The lower number in the Diastolic pressure, which does the force exist while the heart is resting between beats.

Notes:
A gene is a functional unit of chromosomes. They are made up of DNA. Some genes also act as instructions to make molecules called proteins. However, not all genes code for proteins.

Notes:
Malaria (It is a disease caused by Protozoa Plasmodium family)

Notes:
Cloves are aromatic dried flower buds of a tree. Cloves are native to Indonesia and used as a spice in cuisines all over the world. Cloves are now harvested primarily in Indonesia, Madagascar, Zanzibar, Pakistan, and Sri Lanka; they are also grown in India under the name Lavang.

Notes:
When red blood cells are placed in distilled water, the water molecules move into the cells by osmosis because the cells have a higher solute concentration than the distilled water. This influx of water causes the red blood cells to swell and eventually burst in a process known as hemolysis. This demonstrates how osmosis, a vital biological process, can result in cell damage when the external conditions are not balanced.

Notes:
Archosaurs (crocodilians and birds) and mammals show complete separation of the heart into two pumps, for a total of four heart chambers;

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The term “Halitosis” denotes bad breath. It is the persistent, unpleasant odour in exhaled breath, usually not serious, commonly referred to as bad breath.

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.

Notes:
Chlorophylla-a is the primary pigment for photosynthesis in plants. Chlorophyll a is a specific form of chlorophyll used in oxygenic photosynthesis. It absorbs most energy from wavelengths of violet-blue and orange-red light.

Notes:
In the nucleus, the DNA code is transcribed or copied, into a messenger RNA (mRNA) molecule. In the cytoplasm, the mRNA code is translated into amino acids. Translation is orchestrated at the ribosome and it itself partly composed of RNA with transfer RNA playing the role of adaptor.