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National 5 Biology

Unit 2 – Multicellular Organisms

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Teacher: ___________________________________

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National 5

Unit 2: Multicellular Organisms

Homework Booklet

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TOPIC MARK % COMMENT

1 Cells, tissues, and

organs

9

2 Stem cells and

meristems

12

3 Control and Com-

munication

17

4 Reproduction

9

5 Variation

14

6a Transport in

Plants

20

6b Transport in Animals

20

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1—Cells, tissues and organs

1.

4

2.

5

2

6

2—Stem Cells and Meristems

1

2

a.

b.

7

3. (a) Name the type of cells which are undifferentiated and have the potential to turn into other cell types in plants and animals. __________________________ (1) (b) (i) One source of these cells are from embryos. Describe one advantage and one disadvantage from using these undifferentiated cells from embryos. Advantage _____________________________________________________ ______________________________________________________________ (1) Disadvantage ___________________________________________________ _____________________________________________________________ (1) (ii) Apart from embryos, state one other source of these types of cells. _____________________________ (1) (c) Describe a potential use for these types of cells. ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ (1) 4. The following statements refer to meristems.

Which two statements are correct? ______ and ______ (1)

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5. The chart below shows how some specialised cell types are formed from stem cells.

(a) Which intermediate cell can develop into the widest range of mature cell types? _____________________________ (1) (b) Which type of intermediate cell forms both elastic and non-elastic fibres? ____________________________ (1) (c) At which stage in an animal’s development are stem cells most abundant? ____________________________ (1)

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3—Control and Communication

1

2

3 4

10

5

11

6a

b

12

7

13

1

4—Reproduction

2

14

3. (a) The diagram below shows a summary of events that occur during

reproduction in a flowering plant.

(i) Complete the diagram by entering the name of cell type R. (1)

(ii) Which process in the diagram represents fertilisation?

__________________________________________ (1)

(iii) Complete the following table by inserting a tick (√) in the correct boxes to show which of the cells in the diagram have a double or single set of chromosomes.

(2)

(b) Explain the need to produce cells with a single set of chromosomes in reproduction.

____________________________________________________________________

____________________________________________________________________ (1)

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5—Variation and Inheritance

1

16

2

17

3

18

6a—Need for Transport in Plants

Letter Leaf Structure

A

B

C

D

E

F

b) Complete the following table

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Type of cell or tissue Description

Absorbs water from soil solution

Lignified to withstand pressure changes during

transport of water

Main site of photosynthesis in a leaf

Controlled by a companion cell

Protective layer on outside of plant organs

Controls opening and closing of stomata

1

a) Insert the correct name of each structure in the table below.

3

19

2

20

3

21

4

22

6b—Animal Transport

1

2

3

23

4

5

24

6

25

7

26

8 9

10 11

27

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