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The maintenance functions of all living organisms must go on even when they are not doing anything particular. Even when we are just sitting in a class or even asleep, this maintenance job has to go on. These maintenance processes require energy to prevent damage and break-down of cells and tissues, which is obtained by the individual organism from the food prepared by the autotrophs, called producers.
Draw the diagram of an open stomatal pore and label (I) Guard cells, and (II) Chloroplast on it. Mention two functions performed by stomata.
In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be :
What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
How are the lungs designed in human beings to maximise the area for exchange of gases?
which of the following is the correct path of oxygen in the respiratory system.
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