In which of the following processes is oxygen used up?

1. burning

2. photosynthesis

3. respiration

Which of these protects us from the harmful rays of the sun?

Which component of air cannot be used directly by the living beings?

The process in which impure dirty water is allowed to stand undisturbed in a container is called _________.

Things like syringe, dropper,drinking straw work on the principle of _________________.

Which among the following are true about air?

After sedimentation, the action of pouring clear water out into another container is called __________.

Presence of oxygen in the air makes

Identify the property of air that can be seen in the picture.

Seawater is not fit for drinking due to the presence of

Air can be found

What percentage % of oxygen is present in the air?

The given picture best describes the process of :

The process which is not used in water treatment plants.

Vidhu investigated the properties of matter X. She noted down the following observations in her notebook.

1. It has mass

2. It occupies space

3. It can be compressed

4. It takes the shape of the container that holds it

Identify X.

Jiya took a glass of water and added a spoonful of sugar and then squeezed the juice of a lemon into it. She stirred it well and then poured this mixture through a strainer. What will remain in the strainer?

What is shown in the given picture?

Which of these gases is present in a very small quantity in air, and is very important to plants?

The process in which steam is converted into water