Rustomjee Cambridge International School and Junior College
1st TERM EXAMINATION (2012-13)
SUBJECT: BIOLOGY GRADE: VIII Div.__
---Q1. Choose the correct alternative: [10]
1. The diagram shows four places on a river, where water samples were taken.
2. Different pesticides were tested to see how poisonous they were to fish. Scientists found the concentration of pesticide that killed 50 % of
the fish within four days. The table shows the results of the tests. Which pesticide was the most dangerous to the fish?
A) DDT B) dieldrin
Name:_______________________________________________Roll No.__________
Date: ____________ Time: 2 hrs Marks à 80 Marks Obtained: ______
Question Number 1 2 3 4 5 6 7 8 9 10 Total
3. The diagram shows some of the effects of human activity on a river.
What could have caused these effects?
A) air pollution B) deforestation C) over-use of fertilizers D) presence of weed killers 4. A large area is heavily overgrazed for many
years. What is the effect on soil nutrients and soil erosion?
5. The diagram shows a nerve cell.
Name the part that insulates the axon?
A) cell body B) dendrites C) myelin sheath D) none of these 6. Weeds are growing in a crop. What should be used to kill the weeds?
A) artificial fertilizer B) weedicides C) magnesium salts D) organic manure
7. When a bright light is shone into the eye, the diameter of the pupil decreases. What is this an example of?
A) accommodation B) a simple reflex C) photosynthesis D) voluntary response 8. Which of the following does not help pollution to occur?
A) Dumping garbage B) Oil spills C) planting trees D) leaded petrol
9. The broadening of chest and change of voice in a male is under the control of the hormone______________
10. The message that travels along a nerve is called______________. A) stimulus b. response c. sensation d. impulse
11. The map shows a river flowing into the sea. The river is polluted by untreated sewage. At which labelled point will the oxygen content of the water be lowest?
12. How many pairs of spinal nerves are present in man?
A) 12 B) 18 C) 31 D) 24
13. The levels of carbon dioxide in the Earth’s atmosphere have increased during the last one hundred years. What is the most likely cause of this?
A) cutting down large areas of forest B) increased production of crops C) over-use of inorganic fertilizers D) widespread use of pesticides 14. Which of the following is not a function of the skin?
a) to protect the underlying tissues. b) to prevent loss of water. c) to keep the body cool. d) to maintain body balance. 15. Which of the following is a secretion of ovaries?
A) Gonad stimulating hormone B) Thyroxine C) Progesterone D) Adrenaline 16. Which of the following is not one of the R’s used to protect the environment?
17. The graph shows the relationship between sulfur dioxide pollution and the number of lichen species found on trees.
From the graph, which statement is correct?
A) As sulfur dioxide levels increase the number of lichen species decreases. B) Lichens cannot survive if any sulfur dioxide is present.
C) Lichens are not affected by sulfur dioxide pollution.
D) As sulfur dioxide levels increase so do numbers of lichen species. 18. Tidal energy means obtaining energy from______________. A) blowing wind B) high tides entering narrow creeks. C) falling water. D) burning organic matter.
19. Which type of cells do all sense organs contain?
A) ciliated B) effector C) mesophyll D) receptor
20. What changes in the concentration of oxygen , number of bacteria and number of fish are caused by sewage entering a river?
Q2. Answer the following questions
1. Define the term hormone. Describe the position and functions of parathyroid glands. [4] __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ 2. Give two functions of each of the following: [3] a. Cerebrum:______________________________________________________________
__________________________________________________________________________ __________________________________________________________________________ ______________________________________________________________________ b. Cerebellum: ____________________________________________________________
__________________________________________________________________________ __________________________________________________________________________ ______________________________________________________________________ c. Medulla Oblongata: _______________________________________________________
__________________________________________________________________________ __________________________________________________________________________ _____________________________________________________________________
3. State two ways to take care of each of the following sense organs: [2] a. Nose: _________________________________________________________________
___________________________________________________________________________ ___________________________________________________________________________ b. Tongue: _________________________________________________________________
___________________________________________________________________________ ___________________________________________________________________________
4. The below figure shows a section through the eye
a) i) Name the parts labelled A, B and C.
A__________________________________________________________________ B____________________________________________________________________ C_________________________________________________________________[3] ii) Name the part of the eye that contains the light sensitive cells.
_________________________________________________________________[1] iii) Name the part of the eye that brings about changes in the shape of the lens.
_________________________________________________________________[1] 5. The below figure shows part of a forest and an open field:
State the ill effects of chopping the trees on the following: [3]
i. agricultural land:__________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ ________________________________________________________________________
ii. the river:_______________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ ________________________________________________________________________
iii. on the ecosystem:________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ ________________________________________________________________________
6) The figure shows how mercury, released into the sea in chemical waste from a plastics factory, results in the poisoning of local fishermen.
i. How do the fishermen get poisoned with mercury? [1] ___________________________________________________________________________ ___________________________________________________________________________ ii. Suggest why the fishermen got poisoned with mercury but the other organisms did not. [1]
___________________________________________________________________________ ___________________________________________________________________________ iii. The factory is making plastic and releasing chemical wastes. List two ways in which the
factory is affecting the marine ecosystem. [2] ___________________________________________________________________________ ___________________________________________________________________________
7. Acid rain is a serious environmental problem in some areas of the world. Lakes in Canada, Norway and Scotland are highly acidic as a result of acid rain. Fig. 4.1 shows a cause of acid rain.
a) (i) State one cause of acid rain other than that shown in Fig. 4.1.
___________________________________________________________________[1] (ii) Describe two effects of acid rain on forest ecosystems.
1._________________________________________________________________________ 2._______________________________________________________________________[2] (b) Describe two different ways to reduce pollution so that there is less acid rain.
1._______________________________________________________________________ 2._________________________________________________________________________[2] 8. Modern technology can be used to increase the yield of crops.
a) (i) The use of chemicals, such as fertilisers, herbicides and pesticides, is one of the developments used.
(ii) Explain the dangers to the local environment of the overuse of fertilisers on farmland. _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ ___________________________________________________________________[2] (iii) Suggest how the use of herbicides can be of benefit to crop plants.
_____________________________________________________________________[1] (iv) Suggest two dangers of using pesticides on farmland.
1._______________________________________________________________________ 2.________________________________________________________________________[2]
9. Fig. shows changes in the population of bacteria that take place in a river when untreated sewage is added to it.
(a) Describe the changes in the population of bacteria that take place in this river.
_________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________[1]
(b) Suggest an explanation for these changes in the population of bacteria.
_________________________________________________________________________ _________________________________________________________________________ ___________________________________________________________________[2]
Q3. Answer the following questions with the help of the diagram .
1. Fig. 8.1 shows the bones and muscles of a human leg. In Fig. 8.1, the person is sitting with the foot clear of the ground. If a sharp tap is given at X then the lower leg swings forwards. (i) Name and explain this reaction. [2]
In an emergency, a person might have to run suddenly and very quickly. (ii) Name the hormone that the body releases in such an emergency.
______________________________________________________________________[1] _______________________________________
_______________________________________ _______________________________________ ______________________________
(iii) Describe two changes that occur in the body when this hormone is released in such an
emergency. [2]
1.___________________________________________________________________________ ________________________________________________________________________ 2.___________________________________________________________________________ ________________________________________________________________________ 3.___________________________________________________________________________ ________________________________________________________________________ 2. Given below is the structure of the ear label the parts and give one function of each part: [6]
_____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ ________________________________________________________________________
3. The diagram below shows a transverse section of the skin.
___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ii. Name the pigment found in this layer. [1]
__________________________________________________________________________ iii. There are two glands found in the dermis layer of the skin. Name them and give one
function of each. [3]
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ 4. Give the functions of touch and pressure receptors found in the dermis of the skin. [2]
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________
Q4. Give reasons: [8]
1. People living in coastal areas do not suffer from goiter.
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ 2. Leguminous crops should be grown while practicing crop rotation.
__________________________________________________________________________ __________________________________________________________________________ 3. Pituitary gland is called the master gland
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ 4. Terrace farming should be practiced in hilly areas.
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________
Q5. Distinguish between: [8]
1. Adrenal gland Thyroid gland
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ 2. Water pollution Soil pollution
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________
3. Renewable resources Non-renewable resources
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ 4. Simple Reflex Conditional Reflex
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________
e.g________________________________e.g_____________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________
6 a) Complete Fig 1.1 and Fig 1.2 to show the appearance of the eye in the two light
intensities shown. Label the structures you have drawn. [5]
i) Appearance in dim light
b) Account for these changes in the eye. [1]
__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ 2. Blackspot is a disease of rose leaves caused by a fungus. The spots are composed of dead
tissue. The disease appears in polluted and non-polluted areas. Fig. 2.1 shows the spots present on 25 leaflets from rose bushes sampled at random from a polluted area and a non-polluted area. The black spots are visible in the drawings.
(b)Draw a column graph to show the range of numbers of spots per leaflet from the two areas, with both sets of data on the same axes. Distinguish clearly between the two sets of data. [6]
(c) With the help of the graph describe the effect of pollution on the black spot infections.
__________________________________________________________________________ __________________________________________________________________________ _______________________________________________________________________[3]
