Question

Define cell. [1]
Why the cell is called the structural and functional unit of life? [1]
Who discovered cells and how?  [2]
State cell theory. [2]
How organisms are classified based on number of cells? Differentiate between them along with an example each. [2]
Name the largest cell found. [1]
“Multicellular organisms show the division of labour”. Justify the statement.
[2]
8. “Cells show variety in shape”. Justify this statement by giving the structure
of any three type of cells. Mention the function of those cells. [3]​

Answer 1

Answer:

1) the smallest structural and functional unit of an organism, which is typically microscopic and consists of cytoplasm and a nucleus enclosed in a membrane.

2) The cell is called the structural and functional unit of life as all living organisms are made up of cells. Cells are also essential for performing various life processes required for sustaining life. Furthermore, cells provide form and structure, process nutrients and convert them into useable energy.

3) Robert Hooke

The cell was first discovered and named by Robert Hooke in 1665. 

4) Cell theory states that living things are composed of one or more cells, that the cell is the basic unit of life, and that cells arise from existing cells

5) Unicellular organisms

Multi-cellular organisms

1 ) unicellular organisms are made up of a single cell. The single cell regulates all the activity of the organism. Most of the unicellular organisms are invisible to the naked eye. Examples include bacteria, protozoa, unicellular algae, and unicellular fungi.

2) multicellular organisms are made up of more than one cell. Most of the multicellular organisms are visible to the naked eye. Organisms like plants, animals and some algae arise from a single cell and they grow up into multicellular organisms

6 ) The largest cell is an ostrich egg, it is about 15cm to 18 cm long and wide.

7 ) Different cells within a single organism can come in a variety of sizes and shapes. They may not be very big, but their shapes can be very different from each other. However, these cells all have common abilities, such as obtaining and using food energy, responding to the external environment, and reproducing.

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Answer 2

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Conservation of momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant.