SB2b+c: Growth In Animals And Plants Keywords

Question 1

Differentiation

Answer 1

When a group of similar things, such as cells, become different in form from each other.

Question 2

Growth

Answer 2

A permanent increase in the number or size of cells in an organism.

Question 3

Percentile

Answer 3

A tth division of a group. For example, 10 per cent of the data items are below the 10th percentile and 50 per cent are below the 50th percentile.

Question 4

Differentiate

Answer 4

To change into different types, for example when meristem cells differentiate into specialised cells such as xylem or root hair cells.

Question 5

Elongation

Answer 5

When something gets longer (such as a cell in a plant root or shoot before it differentiates into a specialised cell).

Question 6

Meristem

Answer 6

A small area of undifferentiated cells in a plant, such as near the shoot tips and root tips, where cells are dividing rapidly by mitosis.

Question 7

Root hair cell

Answer 7

Cell found on the surface of plant roots that has a large surface area to absorb water and dissolved mineral salts quickly from the soil.

Question 8

Xylem

Answer 8

Cell that joins with other xylem cells to form long, thick-walled vessels after they die. The vessels carry water and dissolved mineral salts through the plant.