In eukaryotic (with nucleus) cells, the vast majority of DNA is found in the nucleus as discrete bodies called chromosomes. The exception to this being the small amount of DNA found in organdies outside the nucleus (mitochondria and chloroplasts). In human cells, more than 99% of the total DNA is nuclear genomic DNA and the remainder mitochondrial.

Correct Option: B

In eukaryotic (with nucleus) cells, the vast majority of DNA is found in the nucleus as discrete bodies called chromosomes. The exception to this being the small amount of DNA found in organdies outside the nucleus (mitochondria and chloroplasts). In human cells, more than 99% of the total DNA is nuclear genomic DNA and the remainder mitochondrial.

Sea hares are molluscs. They belong to Phylum Mollusca and Class Gastropoda like snails. Like many other sea slugs (Subclass Opistobranchia), sea hares lack external shells as adults. Sea hares belong to Order Anaspidea.

Correct Option: B

Sea hares are molluscs. They belong to Phylum Mollusca and Class Gastropoda like snails. Like many other sea slugs (Subclass Opistobranchia), sea hares lack external shells as adults. Sea hares belong to Order Anaspidea.

The allantois is the sac-like extra-embryonic membrane that removes waste from the embryo. As the embryo grows, so does the allantois, eventually pressing against the chorion. This allows the allantois to exchange oxygen and carbon dioxide with the air outside the eggshell. In addition, the allantois also serves as a disposal site for uric acid.

Correct Option: C

The allantois is the sac-like extra-embryonic membrane that removes waste from the embryo. As the embryo grows, so does the allantois, eventually pressing against the chorion. This allows the allantois to exchange oxygen and carbon dioxide with the air outside the eggshell. In addition, the allantois also serves as a disposal site for uric acid.

The maximum 20% of the input of solar energy falling on leaves is converted into chemical energy by green plants. Green plants utilize solar energy and synthesize sugar from CO₂ and water through the process of photosynthesis. However, they are able to utilize only 3% of the light energy that strikes on their green parts; the rest is dissipated as heat.

Correct Option: D

The maximum 20% of the input of solar energy falling on leaves is converted into chemical energy by green plants. Green plants utilize solar energy and synthesize sugar from CO₂ and water through the process of photosynthesis. However, they are able to utilize only 3% of the light energy that strikes on their green parts; the rest is dissipated as heat.

Newton’s Law of Cooling states that the rate of temperature of the body is proportional to the difference between the temperature of the body and that of the surrounding medium. When a body cools by radiation, then rate of cooling depends upon the following factors: l Nature of the radiating surface, that is, emissivity; l Area of the radiating surface; l Mass of the radiating surface; l Specific heat of the radiating body; l Temperature of radiating body and l Temperature of the surrounding.

Correct Option: D

Newton’s Law of Cooling states that the rate of temperature of the body is proportional to the difference between the temperature of the body and that of the surrounding medium. When a body cools by radiation, then rate of cooling depends upon the following factors: l Nature of the radiating surface, that is, emissivity; l Area of the radiating surface; l Mass of the radiating surface; l Specific heat of the radiating body; l Temperature of radiating body and l Temperature of the surrounding.