Sug Ans Ch02e
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Certificate Biology - New Mastering Basic Concepts
Suggested answers Ch 2
Suggested answers The University of Cambridge Local Examinations Syndicate/Midland Examining Group bears no responsibility for the example answers to questions taken from its past question papers which are contained in the textbooks.
Chapter 2
The cell as a basic unit of life
Reinforce and test your learning (p.34) 1
a b
Organic and inorganic Organic: carbohydrates, fats, proteins and nucleic acids (any 2) Inorganic: water and minerals
2m 0.5m x 2 0.5m x 2
2
The development of microscope helps biologists discover cell as the basic unit of structure of organism and establish the cell theory. 1m It helps biologists in studying the structures of microscopic organisms and cells. 1m
3
light microscope, scanning electron microscope, electron microscope
4
There are many misunderstandings:
3m
•
No chloroplasts in animal cells.
1m
•
No large vacuoles in animal cells.
1m
•
Only one cell membrane instead of two.
1m
•
Only one nucleus instead of two.
1m
5
a b c d e f
Onion epidermal cells, xylem cells Onion epidermal cells, cheek cells Cheek cells, onion epidermal cells, red blood cells None of them Cheek cells, onion epidermal cells Onion epidermal cells, xylem cells (2m for all correct answers in each part or no marks)
6
C
1m
7
C
1m
8
B
1m
9
Plant cells are larger than animal cells. 1m Plant cells are usually regular in shape while the shape of animal cells varies. 1m Both types of cells generally contain a nucleus, cytoplasm, a cell membrane and mitochondria. Plant cells have a cellulose cell wall and sometimes a large vacuole. If they are in the light they often have chloroplasts. 1m
10
a b
This is because bubbles are introduced when the student lowers the cover slip onto the slide. 1m One side of the cover slip should be placed on the slide first. 1m Then the other side is slowly lowered by a dissecting needle or a pair of forceps, so that the drops of iodine on the slide will completely fill the gap between the cover slip and the slide gradually without introducing bubbles. 1m
Oxford University Press 2003
Page 1 / 2
Certificate Biology - New Mastering Basic Concepts
11
a
b
c
A is cell membrane. It controls the movement of materials into and out of the cell. B is cytoplasm. It provides a place for cellular chemical reactions to take place. Cell X is a green leaf cell and cell Y is a chicken blood cell. Reasons: (any 2, 1m each) Cell X is rectangular. Cell X contains oval structures which are most likely chloroplasts. Cell X is covered by a cell wall. i Scale = 4.5 : 0.01 Therefore magnification = 4.5 / 0.01 = 450 ii Magnification of eyepiece = 450 / 30 = 15
Suggested answers Ch 2
1m 1m 1m 1m 1m
2m 2m 1m
Examination papers Multiple-choice questions (p.35) 1
D
2
D
3
C
Oxford University Press 2003
Page 2 / 2
Suggested answers Ch 2
Suggested answers The University of Cambridge Local Examinations Syndicate/Midland Examining Group bears no responsibility for the example answers to questions taken from its past question papers which are contained in the textbooks.
Chapter 2
The cell as a basic unit of life
Reinforce and test your learning (p.34) 1
a b
Organic and inorganic Organic: carbohydrates, fats, proteins and nucleic acids (any 2) Inorganic: water and minerals
2m 0.5m x 2 0.5m x 2
2
The development of microscope helps biologists discover cell as the basic unit of structure of organism and establish the cell theory. 1m It helps biologists in studying the structures of microscopic organisms and cells. 1m
3
light microscope, scanning electron microscope, electron microscope
4
There are many misunderstandings:
3m
•
No chloroplasts in animal cells.
1m
•
No large vacuoles in animal cells.
1m
•
Only one cell membrane instead of two.
1m
•
Only one nucleus instead of two.
1m
5
a b c d e f
Onion epidermal cells, xylem cells Onion epidermal cells, cheek cells Cheek cells, onion epidermal cells, red blood cells None of them Cheek cells, onion epidermal cells Onion epidermal cells, xylem cells (2m for all correct answers in each part or no marks)
6
C
1m
7
C
1m
8
B
1m
9
Plant cells are larger than animal cells. 1m Plant cells are usually regular in shape while the shape of animal cells varies. 1m Both types of cells generally contain a nucleus, cytoplasm, a cell membrane and mitochondria. Plant cells have a cellulose cell wall and sometimes a large vacuole. If they are in the light they often have chloroplasts. 1m
10
a b
This is because bubbles are introduced when the student lowers the cover slip onto the slide. 1m One side of the cover slip should be placed on the slide first. 1m Then the other side is slowly lowered by a dissecting needle or a pair of forceps, so that the drops of iodine on the slide will completely fill the gap between the cover slip and the slide gradually without introducing bubbles. 1m
Oxford University Press 2003
Page 1 / 2
Certificate Biology - New Mastering Basic Concepts
11
a
b
c
A is cell membrane. It controls the movement of materials into and out of the cell. B is cytoplasm. It provides a place for cellular chemical reactions to take place. Cell X is a green leaf cell and cell Y is a chicken blood cell. Reasons: (any 2, 1m each) Cell X is rectangular. Cell X contains oval structures which are most likely chloroplasts. Cell X is covered by a cell wall. i Scale = 4.5 : 0.01 Therefore magnification = 4.5 / 0.01 = 450 ii Magnification of eyepiece = 450 / 30 = 15
Suggested answers Ch 2
1m 1m 1m 1m 1m
2m 2m 1m
Examination papers Multiple-choice questions (p.35) 1
D
2
D
3
C
Oxford University Press 2003
Page 2 / 2
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