Reproduction in Animals — Science STD 8 — Question

Which of the following occurs during lightning?

A wooden block is floating in water contained in a beaker. If the beaker is placed in a free falling elevator, during the free fall, the up thrust on the block will be:

Read the following sentences carefully, and choose the incorrect one:

Name the process undertaken by plants for preparing their own food.

Assertion (A) In drip irrigation system, water is not wasted at all .
Reason (R) In drip irrigation system, water is escaped from rotating nozzles and get sprinkled on the crop as if it is raining .

When the hammer strikes the gong of an electric bell, which of the following force is responsible for the movement of hammer?

The various compounds present in coal tar are separated by the process of:

Manure is a natural substance obtained from the animal and plant waste, like cow dung, human waste and plant residue. It supplies essential elements to the soil and makes it more fertile. But, it is not much helpful when a particular nutrient is required in the soil for. particular crop. Which one of the following reason given below is the possible reason for this?

Microorganisms are also known as: