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Page No 66: - Chapter 5 The Fundamental Unit Of Life class 9 ncert solutions Science - SaraNextGen [2024-2025]


Updated By SaraNextGen
On April 24, 2024, 11:35 AM

Question 1:

Make a comparison and write down ways in which plant cells are different from animal cells.

Answer:

Animal cell

Plant cell

Animal cells are generally small in size.

Plants cells are usually larger than animal cells.

Cell wall is absent.

Cell wall is present.

Except the protozoan Euglena, no animal cell possesses plastids.

Plastids (chromoplasts and leucoplasts) are present.

Vacuoles are smaller in size.

Vacuoles are larger in size.

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https://img-nm.mnimgs.com/img/study_content/curr/1/9/8/117/490/Chapter%205_html_m4a8b64fc.jpg

Question 2:

How is a prokaryotic cell different from a eukaryotic cell?

Answer:

Prokaryotic cell

Eukaryotic cell

Most prokaryotic cells are unicellular.

Most eukaryotic cells are multicellular.

Size of the cell is generally small (0.5- 5 µm).

Size of the cell is generally large (50- 100 µm).

Nuclear region is poorly defined due to the absence of a nuclear membrane or the cell lacks true nucleus.

Nuclear region is well-defined and is surrounded by a nuclear membrane, or true nucleus bound by a nuclear membrane is present in the cell.

It contains a single chromosome.

It contains more than one chromosome.

Nucleolus is absent.

Nucleolus is present.

Membrane-bound cell organelles such as plastids, mitochondria, endoplasmic reticulum, Golgi apparatus, etc. are absent.

Cell organelles such as mitochondria, plastids, endoplasmic reticulum, Golgi apparatus, lysosomes, etc. are present.

Cell division occurs only by mitosis.

Cell division occurs by mitosis and meiosis.

Prokaryotic cells are found in bacteria and blue-green algae.

Eukaryotic cells are found in fungi, plants, and animal cells.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Question 3:

What would happen if the plasma membrane ruptures or breaks down?

Answer:

If the plasma membrane of a cell is ruptured, then the cell will die. The plasma membrane regulates the movement of substances in and out of the cell by diffusion or osmosis. Thus, if the plasma membrane is ruptured, then the cell might leak out its contents.

Also Read : Page-No-67:-Chapter-5-The-Fundamental-Unit-Of-Life-class-9-ncert-solutions-Science

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