Roots are mainly responsible for absorbing ____ and ____ for the plant.
Which of the following statement about ozone is correct?
(a) It is essential for breathing.
(b) It absorbs ultraviolet rays.
(c) Its proportion in air is about 3 %.
(d) It is mainly responsible for global warming.
The small pores which are responsible for the exchange of oxygen and carbon dioxide in plants are mainly present on the ___ of plants.
Suppose you have to determine the percentage of carbon dioxide in a sample of a gas available in a container. Which is the best absorbing material for the carbon dioxide?