Kerala Class 7 Model Question Paper Basic Science

Kerala Board

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Papers

ANNUAL EXAMINATION SAMPLE PRACTICE PAPER
BAS I C S C I E N C E
Time :2 Hours Score : 30

1.There is a ‘Cool-off time’ of 15 minute in addition to the writing time.
2.Use the ‘Cool-off time’ to get familiar with questions and to plan your answers.
3.Read questions carefully before answering.
4.There are total 8 activities out of which answer 6 activities.

Activity 1

A) During the cleanliness drive held as part of the cleanliness week celebrations on Gandhi
Jayanthi the following things were collected. Sort the things into appropriate groups.

Paper, banana leaves, plastic covers, mobile phone batteries, paper cups, thermocoal, plastic
bottles, bulbs, glass pieces, shoe, bags and candy covers.

B) What is the importance of scientific segregation of wastes?

Activity 2

Shoe flower, Turmeric, Beetroot, Methyl orange, Phenolphthalein.

A. Classify the given things using the criteria.

B. Does any colour change occur when lemon juice is added to paper rubbed with Shoe flower?
Explain the scientific reason for this?

Activity 3

The heart beat rate of children in a class is given below.
Name of the student Heart beat rate Pulse rate
Mary 154 bpm 154 bpm
Rani 101 bpm 101 bpm

Ajmal 120 bpm 120 bpm
Suresh 158 bpm 158 bpm

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Heart rate after running and playing in the school ground is given below.
Name of the student Heart beat rate Pulse rate
Mary 200 bpm 200 bpm
Rani 160 bpm 160 bpm
Ajmal 180 bpm 180 bpm
Suresh 210 bpm 210 bpm

A) Analyze the tables given above and draw a conclusion.
B) What are the precautions to be taken to protect heart health?

Activity 4

Kochi: Volunteer groups start more dialysis units centered around Kochi.

Did you notice the newspaper report?

A) Dialysis is a treatment for which patients?
B) Write the names of the parts marked 1 and 2 in the picture.

Renal artery
1 Renal vein

Renal tubule

2

C. What are the other excretory organs in the human body?

Activity 5

Mother said that I should wash the frozen fish I bought from the market several times before cooking it.
She suspected that there was some chemical in it.

A) Is this suspicion correct?
B) What could be the reason?
C) What methods can be adopted to keep the fish intact for a long time?

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Activity 6

A pumpkin vine that had grown by itself behind the kitchen was growing well,
but it only produced two or three fruits.

You heard what Babu said
A. why didn't it have many fruits?
B. What are the things to keep in mind for a good harvest?

Activity 7
Observe the picture given below..

A, Which eclipse does this refer to?
B. What is the pecularity of ‘C’ in the picture?
C. Lunar eclipse can be observed directly but we should not observe solar eclipse directly. Write
the methods of observing solar eclipse?

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Activity 8

Observe the picture
A. What is the reason for the current condition of the water body?
B. What are the ways to prevent water pollution?

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Keypoints Score Total
Activity 1 A)Bio-waste - Paper banana leaves
Bio-waste - Plastic, glass, thermocol, plastic bottle, shoes, bag, paper 3
cup
Hazardous waste - Mobile phone battery 5
B) Prevents environmental pollution 2
Reduces health problems

Activity 2 A) Natural indicators
Beetroot, Shoe flower, Turmeric
Laboratory indicators 2
Phenophthalein, methyl orange 5
C) When lemon juice is added to a paper rubbed with Shoe flower, the
paper turns red. This is because the citric acid in lemon juice turns blue 3
litmus red.
Activity 3 A) Normally, heart rate and pulse rate are the same, but when we engage
in strenuous activities, blood flow increases and energy efficiency 2
increases. As a result the heart rate increases. 5
B) Avoid eating too much fatty foods, avoid smoking and drinking
alcohol, prevent lifestyle diseases, and exercise regularly....(Any three) 3
Activity 4 A) For kidney patients 1
B) Kidney Bladder 1
5
C) Skin, Liver, Lung 3

Activity 5 A) True. 1
B) NH4Cl is ammonium chloride added to ice mining. It is used to 2
preserve fish. Even small amounts can cause cancer.
C) Can be stored
Dried 5
Salted 2
Pickled
in the refrigerator

Activity 6 A) Lack of care 1
Infertile seeds 1
B) Fertile Soil 1 5
Suitable climate 1
Good seeds and planting material 1

Activity 7 A) Lunar eclipse 1
B) The moon is completely hidden, hence lunar eclipse is possible. 2
5
C) Solar filter, pinhole projector, telescope projector (any two) 2

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Activity 8 A) Plastic waste
Chemicals
Cleaning animals, vehicles etc. In water bodies 2
Hotel, household, factory waste
(Any two) 5
B) Scientifically separate and dispose of plastic waste. 3
Eliminate chemical waste from factories and only allow clean water to
flow out.
Do not wash animals, vehicles, etc. in water bodies.

Basic Science
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