CBSE 10th Standard Science Subject Life Processes Ncert Exemplar MCQ Questions 2021
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CBSE 10th Standard Science Subject Life Processes Ncert Exemplar MCQ Questions 2021
10th Standard CBSE
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Reg.No. :
Science
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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)
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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
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During respiration exchange of gases take place in
(a)Trachea and larynx
(b)Alveoli of lungs
(c)Alveoli and throat
(d)Throat and larynx
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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)
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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
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CBSE 10th Standard Science Subject Life Processes Ncert Exemplar MCQ Questions 2021 Answer Keys
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(d)
(ii) and (iii)
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(d)
Nostrils \(\longrightarrow\) pharynx \(\longrightarrow\) larynx \(\longrightarrow\) trachea \(\longrightarrow\) alveoli
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(b)
Alveoli of lungs
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(c)
(ii) and (iv)
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(a)
Valves in heart
