Give reson for the following- a ) Nucleus Occupies a peripheral position in mature plant . b) Alveoli in lungs have thin membranes
Answers
Answer:
) Neurons transmit electrical signals from the brain to different ‘parts of the body’ and vice versa. The longest neurons are those that connect the brain and the legs and these are wire like and thin to endure reduction of surface area for fast transmission of signals.
b) Alveoli in the ‘lungs’ are sites of gas exchange. The deoxygenated blood exchanges oxygen at the surface of the alveoli. The thin membrane is required for easy and fast gaseous exchange.
c) The plasma membrane is the main site for initiation of immune responses. The B and T cells of humoral and cellular immune system have receptors on its surface to identify immunogens and initiate the immune activity.
d) Plant cells contain large vacuole filled with cell sap that occupies most of the space inside the cell. Hence the nucleus is pushed to the periphery.
Answer:
a- due to presence of large sized vacuoles in plant cell , it pushes the nucleus to periphery
b- alveoli in lungs have thin membrane , it helps in fast and easy diffusion of gases .
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