The penumatophores have numerous air spaces and small pores in periphery for exchange of gases are lenticels.Why pneumatophores are called as breathing roots

Read the following paragraph and answer the questions based on it. Rhizobium living in root nodules supply nitrates, nitrites and amino acids to that plant and in exchange get energy in the form of carbohydrates from it. Such a mutually beneficial relationship is called symbiosis. Rhizobium produce nitrogenous compounds from atmospheric nitrogen. However, for this process of nitrogen fixation, they need leguminous plants like beans, sweet pea, soyabean, etc. as ‘host’. Beans and pulses are rich in proteins due to the nitrogenous compounds made available by Rhizobium. After harvesting a leguminous crop, the left-over roots and other plant parts are deliberately dumped in farm soil to maintain its bacterial population. The use of Rhizobium has helped to reduce the use of chemical fertilizers and thereby their adverse effects. It has also helped to reduce expenses on fertilizers and thus works to the benefit of farmers. Why does left over roots and other plant parts are deliberately dumped in farm soil after harvesting a leguminous crop?

The exchange of gases between tissue and tissue fluid in animals and intercellular spaces in plants is called as

complete the paragraph by choosing the appropriate words given in the brackets : (external, inhalation, alveolar, breathing, resptration, exhalation) Release of energy from the assimilated food is called .......... Inhalation and exhalation is called ................. When.............. is done, air enters the lungs. The oxygen from this air enters the blood while carbon dioxide from the blood exits from the blood, Through .................. CO_2 is given out. This gaseous exchange occurs through ......... membrane. This is called................ respiration. The RBCs carry oxygen to every cell.