NCERT Class-9 Science Solutions: Chapter 5-The Fundamental Unit Of Life Part 9

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Question 54:

Illustrate only a plant cell as seen under electron microscope. How is it different from animal cell?

Answer:

Result for Plant cell

Plant Cell

Result for Plant cell

Plant Cell and Animal Cell
Plant Cell and Animal Cell

Plant Cell

Animal Cell

Cell wall present

Cell wall absent

Plastids are present

Plastids are absent

It has a large vacuole

It has a small vacuole

Centriole absent

Centriole present

Question 55:

Draw a neat labelled diagram of an animal cell.

Answer:

Result for Animal cell

Animal Cell

Result for Animal cell

Question 56:

Draw a well labelled diagram of a eukaryotic nucleus. How is it different from nucleoid?

Answer:

Any electron microscopic diagram of Nucleus can be drawn. It is a membrane bound organelle.

Image of eukaryotic nucleus

Image of Eukaryotic Nucleus

Image of eukaryotic nucleus

Question 57:

Differentiate between rough and smooth endoplasmic reticulum. How is endoplasmic reticulum important for membrane biogenesis?

Answer:

The ribosomes, which are present in all active cells, are the sites of protein synthesis. Endoplasmic reticulum helps in transporting these proteins to various places. The smooth endoplasmic reticulum help in manufacture of fat and lipids which along with proteins help in building the cell membrane.

Smooth and Rough Endoplasmic Reticulum
Smooth and Rough Endoplasmic Reticulum

Smooth Endoplasmic Reticulum

Rough Endoplasmic Reticulum

(SER)

(RER)

SER has no ribosomal particles on the surface, hence look smooth SER helps in the manufacture of lipids and fat molecules

RER has particles of ribosome on the surface. Ribosomes are the sites of protein synthesis.

Image of Smooth Er and Rough Er

Image of Smooth Er and Rough Er

Image of Smooth Er and Rough Er