Class VII Science(2017)

Royal Government of Bhutan

Sarpang Lower Secondary School

Sarpang

Mid Term Examination 2017

Subject: Science                                                                             Full Marks: 100  

Class: VII Date:21/6/2017Time: 2 Hrs

Section A

Question1

Direction: Each question is followed by four possible answers. Circle the correct answer on the question paper itself.

1.     A branch of science that deals with the study of cells is known as

a.      Cytology                          b. pathology

b.     Biology                             d. zoology

2.     The irregular network of membrane inside the cell is

a.      Endoplasmic reticulum           b. Golgi bodies

b.     Ribosome                                 d. Centrosome

3.     Which one of the following is NOT a part of animal cell?

a.      Nucleus

b.     Cell wall

c.      Ribosome

d.     Cell membrane

4.     All of the following are phases are correct about menstruation cycle EXCEPT

a.      Ovulation phase                       b. Luteal Phase

b.     Follicular phase                        d. Menopause

5.     SonamPema is solving his mathematical problem. Which part of his brain is he using?

a. Medulla oblongata                               b. Cerebellum

c. Cerebrum                                               d. Cranium

6. what is the total number of ribs present in human body?

a. 10                                        b. 12

c. 24                                        d. 36

7. An example of secondary nutrient is

a. S, Ca and Mg                                  b. NPK

c. Fe, B and Zn                                   d. Al, Li and Si

8. what is the atomic number of Na?

a. 11                                                     b. 12

c. 13                                                      d. 14

9. Anaerobic respiration does not require oxygen to oxidize food substance to produce energy. Food is not completely broken down, the chemical equation for this respiration is

a. C₆H₁₂ O₆                     2C₂H₅OH + 2CO_{2 +} Energy   

b.C₆H₁₂ O_{6 +} 6O₂ 6CO₂+ 6H₂O + Energy

c. 6 CO₂ + 12 H₂ O                                                             C₆H₁₂O₆ + 6O₂ + 6H₂O

d. 4 Fe + 3O₂                                    2Fe₂O₃

10.  A solution which is obtained by dissolving a solute in water is said to be

a. dilute solution                                  b. concentrated solution

d. aqueous solution                              d. non aqueous solution

11. Pressure exerted by the gas molecule on the wall of the container is called..

a. Air pressure                                   b. Wall pressure

c. Gas pressure                                  d. Atmospheric pressure

12. Bear in cold places go for long sleep in winter. This adaptive behavior of animals is called……..

a. Migration                                   b. Hibernation

c. Aestivation                                 d. Meditation

13. Non metal that shine brilliantly and used in jewelries

a. Copper                                          b. Carbon

c. Diamond.                                      D. Mercury

14. Which of the following is the product of photosynthesis?

a. Nitrogen                                        b. Oxygen

c. Hydrogen                                       d. Carbondioxide

15. An example of heterogeneous mixture is

a. Oil in water                                     b. salt in bottle

c. Water in container                           d. Rice in sack.

16. A mixturecontains two liquids A and B. Liquid A has a boiling point of 100^o C, and liquid B has boiling point of 90^oC. The best technique to separate two liquids is by

a. Distillation                                      b. Fractional distillation

c. Chromatography                              d. Filtration

17.Which one of the following is NOT a signal that a chemical change has occurred?

a. There is a colour change

b. The original substance is obtained easily

c. A new substance with different properties are formed.

d. Heat or light is given off.

18.  The organisms in the ecosystem are being counted at each level. The statement best describes about

a. Pyramid of biomassb. Pyramid of energy

c. Pyramid of numberd. Pyramid of food.

19.   “ It is an organism that consumes and breaks down dead plants and animals and decays organisms”. What does the above statement represent?

a. Producerb. Decomposer

c. Consumerd. Predator

20. Which of the following is NOT a homogenous mixture?

a. Smoke                                                           b.  O₂

c. Brass                                                             d. Sugar Solutio

Question 2

Fill in the blanks                                                   (10X1 Mark)

a.      The scientist who discovered cell was………………………………..

b.     …………………….. is the largest part of the brain.

c.      The smallest unit of fats are fatty acid and …………………

d.     Lack of vitamin A cause …………………………….

e.      The small openings in a leaf through which carbon dioxide diffuses is called……………………

f.      The interconnection of feeding relationships in an ecosystem is …………………..

g.     Inter conversion of matter occur either due to heating or…………………….

h.     The movement of particle from the region of higher concentration to lower concentration until they are evenly mixed is known as…………………

i.       Farting by one of your friend is smelt in the classroom. This is due to………………….

j.       The constituent of homogeneous mixture in the air is in …………proportion.

Question 3

Write True or False. Correct the false statement.                       (10x1)

1.     Plant cell does not have cell wall.

2.     Melting of ice is an example of chemical change.

3.     Decomposition of animal body is physical change.

4.     Marasmus in children a is caused by deficiency of Vitamin A.

5.     A matured seed undergoes a period of rest called dormancy.

6.     Occurrence of differences among the individuals is known Variation.

7.     The graphical representation of energy flow from one level to another is known as ecological pyramid.

8.     Matter is made up of tiny particles called element.

9.     Graphite is a good conductor of heat and electricity.

10.  Two different gases is a homogeneous mixture.

Question 4

Match theitems of Column A with correct answer of Column B(1x10)

Column A	Column B
a.      Centrosome	1.     Long resting period in summer
b.     Diffusion	2.     A mixture of two solids one of which is iron fillings.
c.      Evolution	3.     NPK
d.     Fertilization	4.     Decomposer
e.      Primary nutrient	5.     Plant cell
f.      Plastids	6.     Movement of particles from the region of higher concentration to region of lower concentration.
g.     Bacteria	7.     Formation of new species
h.     Aestivation	8.     Star like structure
i.       Magnetic separation	9.     A mixture of two or more metals.
j. Alloy	10. Fusion of male gamete with female gamete

Section B

Attempt all the questions from B

Question 5

a.      Draw a labeled diagram of plant cell.(4)

b.     What is cell wall made up of? (1)

c.      Draw one of the food chains in the ecosystem.(2)

d.     Differentiate Epigeal and Hypogeal germination with an example each.(3)

Question 6

a. Write a function each for cerebrum and cerebellum.(2)

b. Sort the following as metal and non metal. (2)

Calcium, copper, iodine, iron, chlorine, zinc.

c.      Complete the following table.                                (3)

Vitamins	Sources	Importance	Deficiency
………………	Carrot,liver,milk	Good vision	Night blindness
D	Fish, liver, butter, cheese	Muscle functioning, minerilazation	…………….
Calcium	Milk, dairy product, vegetable	…………………….	Poor growth of bones and teeth

d. Write at least 4 changes each that occur during puberty in male and female.(4)

e. Classify following changes as physical or chemical change.

Melting of ice, burning of wood, breaking of glass, ripening of fruit. (2)

Question 7

a.      Write the function of the following. (3)

i.                 Nitrogen

ii.               Phosphorous

iii.             Potassium

b.     Harmony in nature is achieved by maintaining a balance in the ecosystem. Draw one food web that you have seen in your locality.(2)

c.      Draw the atomic structure of He.(2)

d.     The atomic number is 13 and the mass number is 27, identify an element with symbol.(2)

Question 8

a.      Differentiate between metal and non metal.            (2)

b.     State the law of conservation of mass.                    (1)

c.      If you are given copper sulphate crystal, how would you prepare a saturated solution at room temperature?                   (4)

d.     Study the diagram and answer the following questions.

                                                                                                                       

1.     Why was black paper used to cover the leaf?                          (1)

2.     What can you conclude from the experiment?                         (2)

Question 9

a.      Pema set up an experiment as shown below, look at the diagram carefully and answer the following questions.

1.     What happens to the level of water in the delivery tube in set up A and set up B?                                                      (1)

2.     Which one is controlled experiment? Why?               (1)

3.     Why is KOH used in the test tube?                             (1)

4.     Name the respiration shown in the experiment.          (1)

5.     What can you conclude from the experiment?            (1)

b.     State any three particle theory of matter.                     (3)

c.      Define Non communicable disease with example.      (2)

Thank you