Question

1. explain why plant cells have a cell wall while animal cells do not have.
2. a group of learners observed onion cells under a microscope and noticed they had a rectangular shape and given structure.

(a) what type of cell were they observing? give a reason for your answer.
(b) why is it important for plant cells to have these structures while animal

Explanation:

Plants are stationary and need structural support and protection against environmental changes, which the cell wall provides. The cell wall also helps in maintaining cell turgor. Animal cells don't need a rigid cell - wall as they are mobile and have other mechanisms for support and protection. The rectangular - shaped cells with a given structure observed in onion are plant cells. Onions are plants, and plant cells typically have a cell wall giving them a more defined, rectangular shape. The structures like the cell wall in plant cells are important for functions such as maintaining shape, providing support against gravity (since plants are upright), and for processes like osmoregulation. Animal cells have a more flexible cell membrane which allows for movement and changes in shape as needed for locomotion and other functions.

Answer:

1. Plant cells have a cell wall because they are stationary and need structural support, protection, and help in maintaining turgor. Animal cells don't have it as they are mobile and have other support mechanisms.
2. They were observing plant cells. Reason: Onions are plants and plant cells have a cell wall giving them a rectangular shape.
3. It is important for plant cells to have these structures for maintaining shape, support against gravity, and osmoregulation. Animal cells have a flexible cell membrane for movement - related functions.