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CBSE 10th Standard Science Subject Life Processes Ncert Exemplar MCQ Questions 2021

Published on: 26/05/2021

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10, and also provide the detail solution for each and every NCERT Exemplar questions. NCERT Exemplar questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams

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Questions:

Multiple Choice Question

5 x 1 = 5

What prevents backflow of blood inside the heart during contraction?

(a)

Valves in heart

(b)

Thick muscular walls of venticles

(c)

Thin walls of atria

(d)

All of the above

Which of the following statement (s) is/ are true about heart?
(i)Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs
(ii)Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs
(iii)Left atrium transfer oxygenated blood to right ventricle which sends it to different body parts
(iv)Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body

(a)

Only (i)

(b)

Only (ii)

(c)

(ii) and (iv)

(d)

(i) and (iii)

During respiration exchange of gases take place in

(a)

Trachea and larynx

(b)

Alveoli of lungs

(c)

Alveoli and throat

(d)

Throat and larynx

Which is the correct sequence of air passage during inhalation?

(a)

Nostrils \(\longrightarrow\) larynx \(\longrightarrow\) pharynx \(\longrightarrow\) trachea \(\longrightarrow\) lungs

(b)

Nasal passage \(\longrightarrow\) trachea \(\longrightarrow\) pharynx \(\longrightarrow\) larynx \(\longrightarrow\) alveoli

(c)

Larynx \(\longrightarrow\) nostrils \(\longrightarrow\) pharynx \(\longrightarrow\) lungs

(d)

Nostrils \(\longrightarrow\) pharynx \(\longrightarrow\) larynx \(\longrightarrow\) trachea \(\longrightarrow\) alveoli

Which of the following statement(s) is (are) true about respiration?
(i)During inhalation, ribs inward and diaphragm is raised
(ii)In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuse into blood and carbon dioxide from blood into alveolar air
(iii)Haemoglobin has greater affinity for carbon dioxide than oxygen
(iv)Alveoli increase surface area for exchange of gases

(a)

(i) and (iv)

(b)

(ii) and (iii)

(c)

(i) and (iii)

(d)

(ii) and (iii)