Growth in Organisms Practice Questions

Which process occurs during the growth of a plant but does not occur during the growth of an animal?

Put a cross ( ☒ ) in the box next to your answer.

☐ A Cell division

☐ B Cell elongation

☐ C Differentiation

☐ D Protein synthesis

In a young cress leaf, some cells develop into guard cells.

Name the process by which these cells develop into guard cells.

One cress seedling had a height of $18$ mm on day 2 and a height of $45$ mm on day 6.

Calculate the mean increase in height per day between day 2 and day 6.

Give your answer in mm per day.

Calculate the increase in the boy's mass between the ages of 1 year and 4 years.

At the age of 2 years the boy's mass was on the 50th percentile.

State what this tells you about his mass compared with other boys of the same age.

Explain why the doctor measures the boy's mass at regular intervals over several years, rather than measuring it only once.

Calculate the mean rate of growth of the seedlings between day 2 and day 6.

Give your answer in mm per day.

Calculate the percentage increase in the mean height of the seedlings between day 0 and day 8.

State what is meant by the term differentiation.

Explain why differentiation is important in the development of the embryo.

Describe how growth occurs in an animal such as a kitten.

An adult cat has stopped growing, but cell division still takes place in its body.

Suggest why cell division is still needed in an adult cat.

Give the letter of the region in which the cells are elongating.

In region C the cells become different types of root cell.

Name the process taking place in region C.

Explain how the processes taking place in regions A and B cause the root to increase in length.

A garden centre sells three brands of plant food, P, Q and R. Each brand is dissolved in water before use.

A student has been asked to find out which brand of plant food produces the greatest growth in sunflower seedlings.

Devise a plan the student could use to investigate this.

Your plan should include how the growth of the seedlings will be measured and how the student will make sure the investigation is a fair test.