NSO Level 2 Class 7 Science Paper 2017 − 18 Higher Questions and Answers Part 5

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Question 28:

The given graph shows heart rates of three persons P, Q and R under different conditions over time. Select the correct option regarding it.


(A) Person P is a dead person whereas persons Q and R are suffering from different heart diseases.

(B) Person P is sleeping; person Q is exercising whereas person R is having irregular heartbeat due to some heart dysfunction.

(C) Persons Q and R have healthy hearts showing changes in heart rate while walking and strenuous exercise, respectively whereas person P is going through a heart attack.

(D) None of these

Question 29:

Rahul collected urine samples from two different persons, X and Y and performed some tests. The tests and the results obtained are tabulated as given.

The Tests and the Results Obtained Are Tabulated as Given
Person XUrine + Few drops of blue colored Benedict՚s

solution + Heat

Red color obtained
Person YUrine + Few drops of blue colored Benedict՚s solution + HeatNo color change

Now, select the correct statement regarding this.

(A) Glucose metabolism of person Y is not normal as no glucose is excreted in his urine.

(B) In person X, glucose level is very high in blood and therefore excess glucose is excreted out of the body through urine.

(C) Person X is a normal healthy person whereas person Y is suffering from diabetes.

(D) None of these

Question 30:

Match column I with column II and select the correct option from the given codes.

Match Column I with Column II and Select the Correct Option from the Given Codes
Column I

(Water harvesting structure)

Column II


AKhadin(i)Himachal Pradesh
BKuhl(ii)Madhya Pradesh
DKata(iv)Tamil Nadu

(A) (a) – (ii) , (b) – (iii) , (c) – (iv) , (d) – (i)

(B) (a) – (i) , (b) – (iv) , (c) – (iii) , (d) – (ii)

(C) (a) – (iii) , (b) – (i) , (c) – (iv) , (d) – (ii)

(D) (a) – (iv) , (b) – (ii) , (c) – (i) , (d) – (iii)

Question 31:

The given photomicrograph shows the transverse section of two blood vessels, X and Y connecting the heart and the lungs.


Identify the blood vessels and select the incorrect statement regarding them.

(A) Blood vessel X connects right ventricle of heart with lungs.

(B) Blood vessel Y connects lungs with left atrium of heart.

(C) Blood in X contains higher percentage of oxygen as compared to blood in Y.

(D) X is pulmonary artery that carries deoxygenated blood from heart to lungs whereas Y is pulmonary vein that carries oxygenated blood from lungs to heart.

Question 32:

Read the given paragraph and select the correct option regarding italicised words in it.

Wool is a natural, renewable, and non-biodegradable animal fibre. The common wool used for production of apparel is Cashmere wool. It is the softest sheep՚s wool in the world. Bailing is the process in which fleece is removed from the body of an animal. It is thoroughly washed to remove dust and dirt. This process is called scouring. Then the hair of different texture is sorted and burrs are removed from them. The clean wool fibres are then passed through rollers whose teeth untangle the fibres and this process is called reeling.

(A) Non-biodegradable is correctly mentioned and should not be replaced.

(B) Bailing should be replaced with shearing.

(C) Cashmere should be replaced with Angora.

(D) The positions of scouring and reeling should be interchanged.

Question 33:

Refer to the given relationship of animals based on the manner in which they obtain their food and select the option that satisfies the same relationship.

Frog:: Bedbug:: Grasshopper





Question 34:

A team of scientists were researching on various parameters of a non-polluted, freshwater lake with fairly good plant and animal population. They recorded dissolved carbon dioxide concentration in that pond on a hot sunny day over a period of 24 hours. Which of the following graphs best represents the changes in carbon dioxide concentration of freshwater pond on that particular day?









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