Question

Q4. Give reasons for the following:
a) Neurons are often long and wire like.
b) Alveoli in lungs have thin membrane.
c) Plasma membrane plays an important role in generating immune responses
d) Nucleus occupies a peripheral position I mature plants cells.​

Answer 1

Answer:

1. neuron present in brain according to structure of brain so that it was called neuron
2. because it help for protection of shock of heard and innner part

c) it was protective membrane and give support and help to recover in ingeris..

d) in centre of chyma cell

Answer 2

(a) Neurons are often long and wire like.

• Neuron cells are the cells which transfers message in electronic form and are present in the brain.
• So for the ease of transfers, they are shaped like that.

(b) Alveoli in lungs have thin membrane.

• Alveoli are thinned as they are present in the lungs  as they are helpful for the exchange of oxygen and carbon dioxide.
• Their thin membrane helps in doing the same.

(c) Plasma membrane plays an important role in generating immune responses.

• These membranes cover the whole cell part.
• So any foreign material entering can be easily detected by them and immediate immune response can be generated.

(d) Nucleus occupies a peripheral position in mature plants cells.​

• Nucleus in the mature plant is present in peripheral position, as they are located inside the chyma cell.
• So they occupy the same.