The full form of UV rays is  _______________________

Which of the following plant have no stomata ?

The respiratory organ in fish are______________.

Ozone layer presents between which of the following two layers of oxygen ?

Which of the following is correct :

(a) Air is required for respiration.

(b) Air helps in the dispersal of seeds.

Plant produce oxygen during _____________ and utilize oxygen during _______________.

The holes in the ozonosphere is due to the attack of a pollutant that is released from  __________________

Which of the following are correct :

(a) Troposphere, stratosphere, mesosphere, thermosphere and  exosphere are the layers of atmosphere.

(b) An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body. 

Which of the following are correct :

(a) Oxygen gets removed from the air during respiration and burning.

(b) The balance of oxygen and carbon dioxide in the atmosphere is maintained through respiration in plants and animals and by photosynthesis in plants.

Ozone hole means