PostGraduate Chemist

Assertion (A) : Most of the plants close their stomata at night.
Reason (R) : Closing of stomata helps to conserve water as large amount of water evaporates from the leaves.

1 week ago | [YT] | 2

PostGraduate Chemist

Assertion (A) : Xylem tissue moves water and minerals obtained from the soil by the roots.
Reason (R) : Xylem tissue is found only in the roots of a plant.

1 week ago | [YT] | 2

PostGraduate Chemist

Assertion (A) : The peristaltic movements occur all along the gut.
Reason (R) : The lining of the gut has muscles that contract rhythmically to push the food in regulated manner.

2 weeks ago | [YT] | 2

PostGraduate Chemist

Assertion (A) : Arteries have valves as they have to withstand high pressure.
Reason (R) : Arteries are vessels which carry blood away from the heart to various organs.

2 weeks ago | [YT] | 2

PostGraduate Chemist

Assertion (A) : The basic filtration unit in the kidneys, like in the lungs, is a cluster of very thin-walled blood capillaries.
Reason (R) : Each capillary cluster in the kidney is associated with the cup-shaped end of a coiled tube called Bowman’s capsule.

2 weeks ago | [YT] | 1

PostGraduate Chemist

Assertion (A) : In human beings, the respiratory pigment is haemoglobin present in red blood cells.
Reason (R) : Haemoglobin has a very high affinity for carbon dioxide.

2 weeks ago | [YT] | 1

PostGraduate Chemist

Assertion (A) : Blood plasma transports carbon dioxide in dissolved form, while oxygen is transported by respiratory pigments.
Reason (R) : Carbon dioxide is more soluble in water than in oxygen.

2 weeks ago | [YT] | 1

PostGraduate Chemist

Give the ratio in which hydrogen and oxygen are present in water by volume.

2 weeks ago | [YT] | 1

PostGraduate Chemist

Sodium and chlorine are reacted, and as a result, sodium chloride is formed, which is also called table salt. What option gives the reactants and products of the reaction?

2 weeks ago | [YT] | 1

PostGraduate Chemist

Safe TDS Ranges

Under 50 ppm: Too pure; water may taste flat and lack healthy minerals.

50–300 ppm: The optimal and ideal range for a crisp, clean taste and balanced mineral content.

300–500 ppm:

 Acceptable to consume, though the water may start to taste slightly heavy or salty.

Above 500 ppm: Not recommended for regular drinking; water can cause scaling in pipes, taste harsh, or contain excessive salts and contaminants.

Above 1,000 ppm: Considered unsafe for human consumption without specialized treatment.

1 month ago | [YT] | 6