LOKESH DAS

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Asked Questions

Point out differences between evaporation and boiling.

Answer:

Evaporation	Boiling
1. Evaporation takes place spontaneously at all temperature.	1. Boiling takes place only at a definite temperature called boiling point at which vapour pressure of the liquid is equal to the atmospheric pressure.
2. Evaporation takes place only at the surface of the liquid.	2. Boiling involves the formation of bubbles of vapours below the surface of the liquid.

Why do the gases do not settle on the bottom of the container?

Since gaseous molecules have a very little force of attraction, are in a rapid motion in all possible directions continuously and gravity has no effect no gaseous state, the gases do not settle on the bottom of the container.

How does frog meet its water requirement?

Frog doesnot drink water directly, but water requirement is maintained by absorbing water molecules directly from its skin, and als it retains body water by absorbing water present in the faecal matters in the region of rectum by rectal papillae cells.

Which cells in liver are phagocytic?

Specialized hepatic cells called kupffer cells serve as phagocytic cells.

Where, when, how and why peristalsis occur?

Peristalsis occurs in the digestive tract downwards to oesophagus after the ingestion of food by contraction and relaxation of muscular wall of alimemtary canal to push food downwards for digestion and absorption along the alimemtary canal.

Differentiate between cloaca and anus.

Cloaca is a common opening of digestive, excretory and reproductive systems.

Anus is a terminal opening of digestive tract.

Why do frogs need hibernation and aestivation?

Being poikilothermic animal, frogs need to undergo hibernation and aestivation to prevent itself from hazards due to extremely fluctuating body temperature as per the surrounding. The extremely low or high temperature may hamper its biological function leading to death.