It is present at the tip of our tongue.

Silk industry began in China and about 100 years later, it was introduced in other countries.

Rhizobium bacteria in the soil cannot make its own food, but can convert atmospheric nitrogen into a soluble form for leguminous plant, which in return provides shelter and food to it.

It is the middle layer which has low level of humus and maximum minerals.

The formula is :  15/500*100=3%

The surface  of villi (small finger like outgrowths ) absorbs the digested food hence due to these projections surface area of small intestine increases.

The cutting of this plant is again buried in the soil to get a new plant of champa.

Yes. In a circuit diagram symbols are used to represent electric components and here positive terminal is shown by a longer line whereas the negative terminal is shown by a short line

This is the function of the pulmonary veins.

It is called blue vitriol or neela thotha.

All of the above show photosynthesis.

Tornado is a dark shaped rotating column of winds from sky to ground whereas all others are different names of cyclones, which is called Hurricane in America and Typhoon in Japan.

Pseudopodia helps both in injestion and movement.

Air is trapped between the fibres of woolen clothes, which is a bad conductor of heat and so keeps us warm.

He was the man who first noticed the magnetic effect in electric current.

The wool obtained from the under fur of Kashmiri goats is woven into Pashmina Shawls.

The pitcher like structure is the modified part of the leaf.

Both are correct

All of the above statements are correct.

Yes, it is made by mixing iron with carbon, chromium, nickel and manganese.

This natural indicator is obtained from lichen and is of purple colour.

Gills in fish help them to breathe.

Salt water of sea makes the process of rusting faster.

Food transportation from leaves to all parts of the plant is done by phloem.

Convex lens converges the light coming from sun and therefore heats it,  which in turn burns the paper after holding it for a few minutes.