Gases are diffused in and out of leaves through small openings called stomata. A stomata is surrounded by two cells called:
Guard cells
Epidermis
Leaf surface
Chloroplast
Name the openings in the tracheal system of insects.
Stigma
Spiracles
Tracheae
Alary muscles
Insects have a protective layer that covers their skin called:
Hairs
Chitin
Keratin
Which one of the following is the by-product gas of photosynthesis?
Nitrogen gas
Ammonia
Oxygen
Carbon dioxide
Carbon dioxide and oxygen diffuse in and out of leaves through small openings called:
Cork cells
Cambium
Stomata
Lenticels
Large amount of water vapour are lost from leaves by which of the following process ?
Photosynthesis
Respiration
Transpiration
Osmosis
Which part of the organism across around which the gas exchange takes place ?
Oxygen receive surface
Gas exchange surface
Gas receive surface
Oxygen exchange surface
Percentage of oxygen present in the atmosphere.
55%
35%
20%
25%
Guard cells become turgid by actively transporting which of the following ions ?
Nitrogen
Potassium
The most numerous cells in the epithelium of the bronchus and bronchioles are called:
Ciliated cells
Smooth muscle
Mucus
Epithelium