Chapter 2 - Cell Division

Question 1

Meiosis

Answer 1

A cell divides to form gametes and the chromosomes are copied so there are four sets. The cell then quickly divides twice in succession to form for gametes each with single set of chromosomes.

Question 2

Tumour

Answer 2

A mass of abnormally growing cells which invade surrounding tissue.

Question 3

Benign tumour

Answer 3

Grow in one place but can grow very large and cause pressure or damage to an organ.

Question 4

Malignant tumour

Answer 4

Spread and invade healthy tissue and otherwise known as cancer. Splits up and releases clumps of cells into bloodstream which are carried round and can launch into organs of the body. Continue uncontrolled division and form secondary tumours which live longer than normal cells and divide more rapidly.

Question 5

Radiotherapy

Answer 5

Cancer cells are destroyed by targeted doses of radiation.

Question 6

Chemotherapy

Answer 6

Chemicals are used to stop cancer cells dividing or make them self destruct.

Question 7

Tissue

Answer 7

Group of cells with similar structure and function working together.

Question 8

Muscular tissue

Answer 8

Contract to bring about movement.

Question 9

Glandula tissue

Answer 9

Contain cells which produce and release enzymes and hormones.

Question 10

Epithelial tissue

Answer 10

Covers the outside of the body and internal organs.

Question 11

Epidermal tissue

Answer 11

Cover and protect surfaces in plants.

Question 12

Palisade mesophyll

Answer 12

Contain many chloroplasts and carry out photosynthesis.

Question 13

Spongy mesophyll

Answer 13

Have large airspaces to make gas diffusion easier.

Question 14

Mitosis

Answer 14

Asexual cell division were two identical cells are formed. This produces more identical cells for growth and repair and replacement.