FAQs on Variety in Cell Number, Shape and Size

Question 1

1. What is the significance of variety in cell number, shape, and size?

Accepted Answer

Ans. The variety in cell number, shape, and size is significant as it allows for specialized functions in different cell types. Different shapes and sizes of cells enable them to perform specific tasks efficiently, such as transportation, protection, and communication within the body.

Question 2

2. How does cell size vary in different organisms?

Accepted Answer

Ans. Cell size can vary greatly among different organisms. For example, single-celled organisms like bacteria have smaller cell sizes, typically ranging from 1 to 10 micrometers. On the other hand, larger organisms like plants and animals have cells that can range from a few micrometers to several centimeters in size.

Question 3

3. What factors determine the shape of a cell?

Accepted Answer

Ans. The shape of a cell is determined by various factors, including its function, genetic makeup, and the external environment. For example, red blood cells have a biconcave shape, which increases their surface area for efficient oxygen exchange. Similarly, nerve cells have long, branching extensions called dendrites that allow for better communication.

Question 4

4. How does cell number vary in different tissues?

Accepted Answer

Ans. The number of cells can vary significantly in different tissues. For instance, tissues like the skin and the lining of the digestive tract have a high number of cells due to their constant turnover and regeneration. On the other hand, tissues like cartilage and bone have a lower number of cells as they are more specialized and have a slower turnover rate.

Question 5

5. Can cell number, shape, and size change over time?

Accepted Answer

Ans. Yes, cell number, shape, and size can change over time. During development, cells undergo division and differentiation, leading to an increase in cell number and changes in shape and size. Additionally, certain factors like injury or disease can also cause changes in cell number, shape, and size. For example, muscle cells can increase in size through exercise (hypertrophy) or decrease in size due to inactivity (atrophy).

Variety in Cell Number, Shape and Size Video Lecture - Science Class 8

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