Cell & Scientific method Structured Question II

Give one difference between the structure of the bacterial cell and an animal cell.

Answer explanation

Bacterium cell has cell wall/no nucleus/no mitochondria

State two similarities and two differences between animals and plants.

Answer explanation

Similarities : both of them contain cytoplasm, cell membrane, vacuole.

Differences: Animal cells do not have cell wall/chloroplast but plant cell have

The diagrams show an animal cell and a plant cell.

Write the name of each part from (a) to (e)

Answer explanation

(a) cell membrane

(b) vacuoles

(c) cell wall

(d) vacuole

(e) cytoplasm

Nerve tissue can be found in the ___________ & _______________________

Answer explanation

brain and spinal cord

Identify the type of cells and state their function.

Answer explanation

Nerve cells, to carry nerve impulses /messages from one part of the body to another/around the body

Identify the type of cells and state their function.

Answer explanation

Red blood cells, to transport oxygen around the body

Why do you understand by the following two terms in plants?

(i) tissue

(ii) organ

Answer explanation

(i) tissue : a group of similar cells that have the same origin and carry out the same function/ many cells of the same type working together to do the same job.

(ii) organ : formed from many different tissues that are joined together to serve a common function/ organ is made up of different tissues which work together to do a particular job.

Name five systems in the human body.

Answer explanation

respiratory system

digestive system

nervous system

circulatory system

reproductive system

Define Dependent Variable & Independent variable.

Answer explanation

Independent variable : This is the one variable that is changed/doesn't depend on that of another/investigator manipulates it.

Dependent variable : This is the variable that gets measured/the value depends on that of another

Write at least 3 steps of scientific method.

Answer explanation

Question/Problem

Research/Background

Hypothesis

Experiment

Analysis

Conclusion