Rustomjee Cambridge International School and Junior College 1st TERM EXAMINATION (2012 - 13)
SUBJECT: BIOLOGY Std: VII Div.____
Question Number
1 2 3 4 5 6 7 8 9 10 Total
Marks Obtained
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---QI. Circle the correct alternative: - [10 marks]
1. The photograph below shows some onion cells as seen using the high power of a light microscope. What does the part labelled X depict?
a. Nucleus b. Mitochondria
c. Chloroplast d. none of these
2. A pathogen is:
a. A virus that causes a disease b. any organism that causes a disease
c. A disease caused by bacteria d. any organism transmitted from humans to humans 3. A plant moves in the direction of a stimulus. What is this phenomenon called?
a. Trotting b. tropism c. hopping d. pacing
4. The cell wall is rigid due to the presence of:
a. fats b. proteins c. cellulose d. starch
5. Which group of waste materials are likely to be decomposed most quickly by the action of micro organisms?
a. Glass and building bricks b. shredded paper c. mouldy food d. toxic chemicals
Name:_____________________________________________________Roll No.__________
Date: ____________ Time: 2hrs Marks 80 Marks Obtained: ______
6. The diagram shows a human arm:
What happens to muscles X and Y when the arm is straightened?
X Y
a. contracts contracts
b. contracts relaxes
c. relaxes contracts
d. relaxes relaxes
7. The size of the vacuole in a plant cell is
a. Larger than the nucleus of a plant cell b. smaller than the nucleus of the plant cell c. Is of the same size as the plant cell d. none of these.
8. Amoeba feeds on:
a. Minute bacteria and algae b. Minute virus c. Fungi d. All of these
9. What is the main function of muscle?
a. absorption b. conduction c. contraction d. transport
10. Which of the following is the function of centrosomes?
a. Initiates cell division b. helps in the transmission of genetic characteristics c. holds the cell organelles together d. gives shape to the cell.
11. Bacteriophage is a virus that invades
a. Bacteria b. fungi c. protozoa d. algae
12. Which of the following is not an organ of locomotion in micro organisms?
a. Pseudopodia b. cilia c. tube feet d. flagella
13. What is the size of the cell measured in?
a. Micro metres b. millimetres c. centimetres d. metres
14. Which of the following is not a red alga?
a. Chondrus b. Diatoms c. Polysiphonia d. none of these
15. What do the ligaments connect?
a. muscles to bone b. bone to bone c. muscles to skin d. muscles to muscles 16. Cells contain long thread – like structures that carry genetic information. What are these
structures called?
a. chloroplast b. chromosomes c. genes d. nucleolus
17. Which of the following pairs of organisms are unicellular?
a. Moulds and mildew b. bacteria and amoeba
c. spirogyra and amoeba d. yeast and spirogyra
18. The vertebrae are joined together by joints that are:
a. Immovable b. fixed c. partially movable d. movable.
19. In unicellular organisms:
a. All cells are identical b. The cell can exist on its own
c. different cells are specialised to perform different functions d. All cells are different 20. The diagram shows a maize seedling which is placed horizontally in damp soil in a dark
What will the seedling look like in a few days?
II. Match the disease in column A with the name of the organism in column B [2 ½]
A B
i. AIDS a. Fungi
ii. Ringworm b. Virus
i. Amoebic dysentery c. Virus
ii. Rust of wheat d. Fungi
iii. Polio e. Entamoeba
i ______ ii. ______ iii. ______ iv. ______
III. Answer the following questions:
1. The diagram below shows a structure found in the cytoplasm of both plant and animal cells, as seen using an electron microscope.
a. Identify the structure shown in the diagram-_________________________________[½]
b. Label X and Y [1]
c. State the function of X and Y [2]
_______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ ____
2. The figure given below shows the bones and muscles of a human leg.
Muscles in the leg work antagonistically.
a. State which muscle is antagonistic to muscle A-______________________________ [½]
Femur
b. Explain what is meant by antagonistic muscles. [1] _______________________________________________________________________ _
_______________________________________________________________________ _
c. Describe the function of joint X [1]
_______________________________________________________________________ _______________________________________________________________________ __
d. State the function of the synovial fluid in the joint X. [1]
_______________________________________________________________________ _______________________________________________________________________ __
e. Identify the connective tissue that binds C to the femur. [½] _____________________________________________________________________
3. The below figure shows a one – celled organism that has both animal and plant characteristics
i. Label the two parts of this organism that help us to identify it as having the features of an
ii. State one reason in each case why the organism might be identified as: [2]
a) A plant: ______________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ b) An animal : ___________________________________________________________
_____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ 4. The photograph below shows a mitochondrion as seen using an electron microscope
a. Label the parts A, B and C [1 ½]
A: _________________________ B: ______________________ C: _________________________
b. Mitochondria are known as the power house of the cell. Explain [2]
_______________________________________________________________________ _
_______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________
A B C
_______________________________________________________________________ _____
c. Plant cells have a small number of mitochondria present in them. Explain [2]
_______________________________________________________________________ _
_______________________________________________________________________ _______________________________________________________________________ __
5. Plants grow towards the light. Jim did an experiment to show this.He grew barley seedlings and set up the experiment as shown:
Fig 2: After four days
i. Complete the diagrams below by carefully drawing the appearance of the seedlings after
four days in these conditions [1]
ii. Define the movement shown by these plants. [1]
_______________________________________________________________________ _
_______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ ___
iii. State the role of auxins in the growth of plants. [1]
_______________________________________________________________________ _
_______________________________________________________________________ _______________________________________________________________________ __
6. Fig 1.1 shows three organisms (not drawn to the same scale)
A B C
i. Identify the three types of organisms shown in fig 1.1 [1 ½ ]
A. ________________________ B.________________________
ii. In the above figure, identify the organism that would not bring about decay of organic
matter giving reasons for your answer [1½]
_______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _____
7. The diagram shows a plant cell.
a. Name the parts labelled A, B and C [1 ½ ]
A: ______________________ B: _____________________C:__________________
b. Name two structures present in a plant cell and that are not present in an animal cell. [1]
_______________________________________________________________________ _
c. Name one structural feature found in both cells. [½ ]
_______________________________________________________________________ _
8. Given below is a diagram of a fish.
i. Label the pectoral and tail fins. [1]
ii. Explain the role of these fins in the locomotion of this fish. [2]
9. Fig. 6.1. is a photograph of some root nodules from a pea plant, which is a type of legume.
i. Name the bacterium that is present in the root nodules of this plant. [½ ]
______________________________
ii. Suggest how the pea plant benefits from these bacteria. [2]
________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________
10.The photograph below shows a chloroplast as seen using an electron microscope. It has been magnified 5000 times.
a. Name the parts labelled A and B [1]
A: ___________________________ B: ______________________
b. Explain the significance of chloroplast to a plant. [1]
________________________________________________________________________ ________________________________________________________________________
c. The magnification of this chloroplast is × 5000 times. Measure the width of the
chloroplast between points X and Y on the photograph. Calculate the actual width, of the chloroplast, expressing the answer in mm. show your working. [3]
________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________
Answer: ____________mm
11.The diagram shows an arm movement.
a. Name the joint that allows this movement. [½]
_______________________________________________________________________ _
b. Explain the role of this joint in our body. [1]
________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________
12.Two containers, X and Y, were filled with equal amounts of dough mixture for making bread. The mixture in Y had yeast in it. The diagram shows their appearance after sometime.
i. Which substance produced by the yeast causes the difference between X and Y?
[½]
a. Alcohol b. carbon dioxide c. lactic acid d. oxygen.
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________
ii. Name the group of organisms to which yeast belongs to. [1]
__________________________________________________________________________ 13. Given below is a diagram of Euglena:
i. Name and label
the organ of locomotion. [½]
ii. The organ of locomotion of Euglena is similar to a motor. Explain. [2]
_______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ ______
14. a. Given below are some food items. Below each picture, write down the method by
_______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ ___
15. Given below is a diagram of the human ribcage:
i. Label the following parts in the diagram: [2]
a. sternum b. b. true ribs c. c. false ribs d. d. floating ribs
ii. State the functions of the ribcage. [2]
_______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ __
IV. Distinguish between: (2 points each) [6]
Geotropic movement Nastic movement
Spirogyra Volvox
Chromoplast Leucoplast
V. Give reasons: [8]
1. Lysosomes are known as the suicidal bags of the cell.
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________
__________________________________________________________________________ __________________________________________________________________________ 2. Food preservation is very important. (2 points)
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ 2. The response of a plant shoot to water differs from its response to gravity.
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ 3. Cell division is very important for human beings.
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________
VI. Complete the following table: [4]
b. Explain the role of this joint in our body.
_______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ __
