Chapter 3




A. Fill in the blanks.
B. Match the following column:
C. Tick the correct option.

Answer: vacuole

Answer: a single cell

Answer: nuclear membrane

D. Answer the following questions in brief.

Answer: The (main) factors that determine the shape of a cell are location and function.

Answer: Distinguish between unicellular and multicellular organisms are

Unicellular organisms are made up of a single cell. e.g., Euglena and Amoeba.

Multicellular organisms are made up of many cells. e.g., Humans and Birds.

Answer: Cell wall is present in plant cell. Due to this, plant cells are more rigid than animal cells.

Answer: Mitochondria is known as the Powerhouse of the cell.

Mitochondria are the site of cellular respiration. Energy is produced during this process. Due to this, mitochondria are called the Powerhouse of the cell.

Answer: Chloroplast is responsible for imparting colour to the leaves. Chromoplast is responsible for imparting colour to fruits.

E. Answer the following questions.

Answer: three different cell types found in human beings are:

DAV Solutions for Class 8 Science Chapter 1

These figures clearly show that liver cell is irregular in shape, fat cell is spherical and muscle cell is spindle-shaped. This shows that all cells in an organism do not have the same shape.

Answer: Chromosomes are formed in the nucleus during cell division. When the cell is ready to divide, the chromatin (in nucleus) condenses to form thicker, thread-like chromosomes. Chromosomes are responsible for inheritance of characters from one generation to the next generation.

Answer: When the cell membrane gets damaged, it exposes the cell’s contents to external environment. This results in stoppage of all functions of the cell, and eventually to cell death.

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