Question 8
[Maximum number: 1]
The diagram shows a cell before and during mitosis.
At which stage are the chromosomes copied?
IGCSE Biology Extended 17.2 Mitosis Question Bank
Question 2
Question 2(c)
(a)
All cells develop from stem cells.
Describe what is meant by the term stem cell.
[ 2 ]
Question 3
[Maximum number: 2]
Cells in the lining of the stomach secrete gastric juice, which contains hydrochloric acid and pepsin.
Question 3(c)
(a)
There are stem cells in the epithelial tissue that forms the lining of the stomach.
Explain why these stem cells are necessary.
[ 2 ]
Question 3
Question 3(b)
(a)
Fig. 3.2 shows the life cycle of a fern. The life cycle of a fern has some similarities and some differences compared with the life cycles of other plants.
The letters represent processes that occur during the life cycle.
The haploid stages of the life cycle are represented by (n).
The diploid stages of the life cycle are represented by (2 n).
Fig. 3.2
[ 1 ]
Question 3(b)(iii)
(i)
State the name of process D in Fig. 3.2.
[ 1 ]
Question 3
[Maximum number: 8]
Red blood cells in humans are produced from stem cells.
Fig. 3.1 shows how a red blood cell is produced and becomes specialised.
Fig. 3.1
Question 3(a)
(a)
Use the information in Fig. 3.1 to describe how red blood cells are produced and explain how they are adapted to their function.
[ 6 ]
Question 3(c)
(b)
Stem cells are also found under the outer layer of the skin.
Explain why stem cells are found in the skin.
[ 2 ]
Question 4
Question 4(c)
(a)
Draw an X on Fig. 4.1 on the structure where meiosis occurs.
[ 1 ]
Question 3
Question 3(a)
(a)
Meiosis and mitosis are important processes in the life cycles of organisms.
Fig. 3.1 shows the life cycles of two different organisms.
Organism 1 has a simple life cycle.
Organism 2 has a complex life cycle. It has a stage A that produces spores and a stage B that produces gametes.
In the diagrams, the haploid number of chromosomes is represented by n. The diploid number of chromosomes is represented by 2 n.
organism 1
organism 2
Fig. 3.1
[ 8 ]
Question 3(a)(i)
(i)
Table 3.1 shows the letters P to T in Fig. 3.1 and the type of nuclear division.
Place a tick ( ) in each row to indicate the type of nuclear division that occurs at each of the letters, P to T.
Table 3.1
[ 3 ]
Question 3(a)(iii)
(ii)
An embryo contains stem cells.
Complete the sentences about stem cells and body cells.
Stem cells are cells that divide by to produce daughter cells that can become for a specific function.
Most body cells in an organism contain the same genes, but many genes in a particular cell are not because the cell only makes the specific it needs.
[ 5 ]
Question 27
[Maximum number: 1]
Cell division has the following functions.
1 asexual reproduction
2 growth
3 production of gametes
4 repair of damaged tissue
5 replacement of cells
Which functions are specific to mitosis?
A
1, 2, 3 and 4
B
1, 2, 4 and 5
C
2, 3 and 4 only
D
3,4 and 5 only
Question 4
[Maximum number: 6]
Mitosis and meiosis are both important processes for life.
Question 4(a)
(a)
Complete the sentences about mitosis and meiosis.
Mitosis is a type of nuclear division which produces genetically identical cells. It is important for growth, of tissues and reproduction.
Just before mitosis the chromosomes are replicated and then the chromosomes so that the chromosome number is maintained in each daughter cell.
Meiosis is another type of nuclear division that is involved in the production of gametes. The chromosome number is halved from to haploid resulting in genetically different cells. The fusion of the nuclei of two gametes formed by meiosis forms a This process is known as .
[ 6 ]
Question 30
[Maximum number: 1]
The graph shows how the mass of DNA changes during a mitotic cell division.
Where on the graph are two cells formed?
