work shhet

1. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
First TERM EXAMINATION- 2011
G. A. Atoll School, kolamaafushi
Biology/Grade 8
2 hours 30 mins Date: 19th
may 2011
READ THESE INSTRUCTIONSFIRST
 Do not use staples, paper clips, highlighters, and glue or correction fluid.
 Write your name, class and index on the answer sheet in the spaces provided.
 Answer all the questions.
 Write your answers in the spaces provided on the Question Paper.
 This paper consists of two sections.
 The number of marks is given in bracket ( ) at the end of each question or part question.
 Total marks for this paper is 100.
 At the end of the examination, fasten all your work securely together.
This document consists of 15 printed pages
Name: Class: Index:

2. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
Section A
Choose the correct letter and circle the letter (30 marks)
1. A chemical molecule contains sulphur and phosphorous. Which of the following could it
be?
A. A carbohydrate B. A fatty acid C. A protein D. Glycerol
2. Which processes moves sugar from leaf cells into phloem tissue?
A. Active transport B. Osmosis C. Diffusion D. Photosynthesis
3. Respiration in living organisms always involves?
A. Oxygen consumption C. Carbondioxide production
B. Energy release D. Gaseous exchange
4. Which of the substances must be present in the soil for the growth of a healthy green
plant?
A. Glucose B. Amino acid C. Carbondioxide D. Magnesium
5. Which structures in a plant cell contain DNA and cellulose?
DNA Cellulose
A
B
C
D
Cell wall
Chloroplast
Cytoplasm
Nucleus
Cytoplasm
Nucleus
Chloroplast
Cell wall
6. Some substances in living organisms move by active transport. Which line is correct for
active transport?
A. Movement of substances from low concentration to high concentration by using
energy.
B. Movement of substances from low concentration to high concentration without using
energy.
C. Movement of substances from low concentration to low concentration by using
energy.
D. Movement of substances from low concentration to low concentration without using
energy.

3. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
7.
8.
9. Starch is an example of :
A. Monosaccharide B. Lipids C. Disaccharides D. Polysaccharides
10.
A. Petals B. stem C. root D. flower
11.Which feature helps plants to make most food by the process of photosynthesis?
A. Spiky leaves C. Shiny surfaced leaves
B. Broad and flat leaves D. Variegated leaves

4. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
12.Starch is digested to maltose by the enzyme amylase.
According to ‘lock’ and ‘key’ hypothesis, which is the ‘key’ and which is the ‘lock’?
‘key’ ‘lock’
A
B
C
D
Amylase
Amylase
Starch
Starch
Maltose
Starch
Amylase
Maltose
13.
A. Roots B. flowers C. leaves D. fruits
14.
15.Which chemical change takes place in green plants but not in mammals?
A. Glycogen into glucose C. Glucose into cellulose
B. Starch into glucose D. Glucose into glycogen.

5. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
16.What is the function of each type of plant cell?
Palisade cell Phloem cell Root hair cell
A Photosynthesis Sugar transport Ion uptake
B Photosynthesis Sugar transport Transpiration
C Transpiration Photosynthesis Ion uptake
D Transpiration Photosynthesis Sugar transport
17.Which one of the following chemical elements is needed for the proper growth of roots?
A. Calcium B. Iron C. Phosphorous D. Magnesium
18.The sum of all chemical reactions that takes place in a living organisms is
called………………….
A. Anabolism B. Metabolism C. Catabolism D. Respiration
19.Which one of the following is the function of stomata?
A. Carries water and mineral salts.
B. Allows for gaseous exchange between the air spaces
C. Main site of photosynthesis
D. Protects the plant against diseases
20.The cells of green plants make their food from simple inorganic materials. In what form
does this food being stored in the plants?
A. As glucose B. As starch C. As protein D. As mineral
21.What is the function of skeletal tissue?
A. Sets up nerve impulses.
B. Binds and strengthens around the body
C. Supports and protects softer tissues and allows movement
D. Lines tubes such as gut and covers surface such as skin
22.Some molecules change the likelihood of an enzyme being able to bind to its substrate.
Which one of the following makes this binding more likely?
A. Products B. Activators C. Inhibitors D. Proteins
23.Atmospheric carbondioxide converted into carbohydrates by
A. Combustion C. Respiration
B. Decomposition D. Photosynthesis

6. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
24.The diagram shows one type of a plant cell.
What type of a cell is it?
A. Epidermal cell of a leaf C. Root hair cell
B. Mesophyll cell of a leaf D. Xylem cell
25.Which two structures are found only in plants?
A. Cytoplasm and cell membrane C. Cell wall and sap vacuole
B. Nucleus and sap vacuole D. Chloroplast and cell membrane
26.The diagram shows a plant cell as seen under a microscope.
What are the functions of numbered parts?
Control the entry of
substances
Synthesis of
carbohydrates
A
B
C
D
1
2
3
3
3
1
2
1
27.Which of the following is the subunit of protein?
A. Glucose B. Protein C. Glycerol D. Nucleotides
28.Which gas is released during respiration?
A. Oxygen C. Hydrogen
B. Nitrogen D. Carbondioxide
1
2
3

7. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
29.
30.

8. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
Section B
1. The diagram below shows the internal structure of leaf
a) Label the diagram above. [6m]
A………………………….……….... D………………………………….
B……………………………………. E………………………………….
C……………………..……………... F…………………………………..
b) Which of the structures labeled on the diagram
i) Is where most photosynthesis takes place? [1m]
……………………………………………………………………………………………………
ii) Which of the structures contain chloroplasts? [1m]
……………………………………………………………………………………………………
iii)Name the pigment found in the chloroplasts and write its function. [2m]
……………………………………………………………………………………………………
……………………………………………………………………………………………………
[Total: 10 marks]
2. a) List the characteristics of living things [3m]
………………………………………………………………………………………………………
……………………………………………………………….………………………………………
A
B
C
D
E
F

9. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
b) Carbohydrates consist of Carbon, Hydrogen and Oxygen. What additional elements
are needed to covert a carbohydrate into a protein? Where do you think the plant get
those elements from? [2m]
…………………………………………………………………………………………………
………………………………………………………………………………………………….
c) Write the subunits of the following molecules. [3m]
i) Carbohydrates……………………………………………………………………………..
ii) Nucleic acids………………………………………………………………………………..
iii) Lipids ………………………………………………………………………………………
3. Write the name and functions of the following cells. [Total:4 marks]
a)
b)
4. a) The diagram below shows the process of osmosis
Name:………………………………………
Function:……………………………………
………………………………………………
………………………………………………
………………………………………………
Name:………………………………………
Function:……………………………………
………………………………………………
………………………………………………
………………………………………………
RegionA RegionB
Key:
Water
Salt

10. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
i) Label the membrane with the letter C. [1m]
ii) State the region where the water potential is high. [1m]
…………………………………………………………………………………………………
iii)What is the meaning of semi-permeable membrane? [1m]
…………………………………………………………………………………………………
…………………………………………………………………………………………………..
iv)On which way would be the net flow of water? [1m]
…………………………………………………………………………………………………
…………………………………………………………………………………………………..
v) Define the term ‘osmosis’ [2m]
…………………………………………………………………………………………………
…………………………………………………………………………………………………
b)
i) Describe the water potential of the liquid. [2m]
……………………………………………………………………………………………………
……………………………………………………………………………………………………
…………………………………………………………………………………………….………
ii) Explain the effect of water potential of the liquid on the cells. [2m]
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
[Total : 10 marks]

11. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
5. The diagram shows the stages in testing a green leaf for starch.
The stages are not in correct order.
a) Place the letters of the stages in the correct order by writing the letters in the boxes.
The last stage has been completed for you. [4m]
b) Give the reason for each of the following stages: [3m]
i) Stage C
…………………………………………………….............................................................
ii) Stage B
………………………………………………………………………………………………
iii)Stage E
………………………………………………………………………………………………..
Leaf rinsedin
water

12. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
c) What is the positive result for iodine test for starch?
………………………………………………………………………………………………[1m]
[Total: 8 marks]
6.
b) Name the storage organelle found in animal cell and plant cell.
……………………………………………………………………………………………….…[2m]
c) The storage molecules of these cells come under which type of biological molecule?
………………………………………………………………………………………...……[1m]
d) Name an animal cell which does not have a nucleus.
……………………………………………………………………………………..….……[1m]
e) In which part of the cell does chemical reaction takes place?
……………………………………………………………………………………………..[1m]
[Total: 8 marks]

13. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
7.

14. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
c)Explain the ‘lock’ and ‘key’ hypothesis of the enzyme reaction.
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
…………………………………………………………………………………………………[4m]
[Total: 13 marks]
8. Define the following:
a) Diffusion
………………………………………………………………………………………………………
………………………………………………………………………………………………………
…………………………………………………………………………………………………[2m]
b) Multicellular organism
………………………………………………………………………………………………………
…………………………………………………………………………………………….……[1m]
c) Catabolism
………………………………………………………………………………………………………
………………………………………………………………………………………………….[1m]
d) Respiration
………………………………………………………………………………………………………
…………………………………………………………………………………………………[1m]
[Total: 5 marks]
9. Answer any one of the following questions. [4m]
a) Explain how you would carry out the experiment to ensure that chlorophyll is
necessary for photosynthesis.
b) Explain how xylem vessels are adapted for their function.

15. GA. Atoll School /Firstterm test2011 Grade 8/ Biology
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
………………………………………………………………………………………………………….
All thebest