Vidaara.orgClass 9 · Mathematics
CodeVID-M9-WS
Respiration and Transport — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
40 × 1 = 40 marks
1.
In which precise compartment of the cell does glycolysis take place?
- A.Mitochondrial matrix
- B.Cristae
- C.Cytoplasm
- D.Nucleus
2.
What is the final electron acceptor in the mitochondrial electron transport chain?
- A.Pyruvate
- B.Oxygen
- C.Carbon Dioxide
- D.Water
3.
What is the net yield of ATP molecules per molecule of glucose during anaerobic respiration?
- A.38 ATP
- B.36 ATP
- C.4 ATP
- D.2 ATP
4.
Which component of ATP holds the highly unstable bonds that release energy upon breaking?
- A.Ribose sugar
- B.Adenine base
- C.Phosphate groups
- D.Deoxyribose
5.
During aerobic respiration, which pathway generates the largest share of ATP molecules?
- A.Glycolysis
- B.Krebs Cycle
- C.Oxidative Phosphorylation
- D.Fermentation
6.
Which structure acts as a lid to close off the larynx during swallowing?
- A.Glottis
- B.Epiglottis
- C.Pharynx
- D.Bronchus
7.
During a deep exhalation, what action do the diaphragm and intercostal muscles perform?
- A.Both contract
- B.Both relax
- C.Diaphragm contracts, muscles relax
- D.Diaphragm relaxes, muscles contract
8.
What is the term for the air volume that always remains in the lungs and cannot be exhaled?
- A.Tidal Volume
- B.Vital Capacity
- C.Residual Volume
- D.Total Lung Capacity
9.
What is the correct chronological sequence of air passage during inhalation?
- A.Nasal Cavity $\rightarrow$ Larynx $\rightarrow$ Pharynx $\rightarrow$ Trachea
- B.Nasal Cavity $\rightarrow$ Pharynx $\rightarrow$ Larynx $\rightarrow$ Trachea
- C.Pharynx $\rightarrow$ Larynx $\rightarrow$ Trachea $\rightarrow$ Bronchioles $\rightarrow$ Bronchi
- D.Larynx $\rightarrow$ Pharynx $\rightarrow$ Trachea $\rightarrow$ Alveoli
10.
What is the average Tidal Volume of a healthy adult at rest?
- A.1200 mL
- B.500 mL
- C.3500 mL
- D.6000 mL
11.
What basic physical mechanism governs the exchange of respiratory gases across membranes?
- A.Active transport
- B.Osmosis
- C.Simple diffusion
- D.Endocytosis
12.
What is the typical partial pressure of oxygen ($p\text{O}_2$) in deoxygenated blood arriving at the alveoli?
- A.104 mmHg
- B.40 mmHg
- C.95 mmHg
- D.45 mmHg
13.
Which change will cause a shift of the oxyhaemoglobin dissociation curve to the right?
- A.Decrease in temperature
- B.Increase in pH
- C.Decrease in $p\text{CO}_2$
- D.Increase in hydrogen ion concentration (Lower pH)
14.
The phenomenon where hydrogen ions and $CO_2$ alter haemoglobin's affinity for $O_2$ is called...
- A.Haldane Effect
- B.Bohr Effect
- C.Hamburger Phenomenon
- D.Countercurrent Exchange
15.
Why is the alveolar respiratory membrane ideal for maximum diffusion rates?
- A.It is thick and muscular
- B.It has low blood supply
- C.It is ultra-thin and highly vascularized
- D.It contains mucus secreting cells
16.
Through which structure does the vast majority of plant transpiration take place?
- A.Lenticels
- B.Cuticle
- C.Stomata
- D.Root hairs
17.
Which environmental condition will drastically slow down the rate of transpiration?
- A.High wind speed
- B.Intense sunlight
- C.High relative humidity
- D.Elevated temperature
18.
The structural attraction between water molecules and the cell walls of xylem vessels is called:
- A.Cohesion
- B.Adhesion
- C.Surface Tension
- D.Guttation
19.
Which theory best explains the long-distance ascent of sap in tall trees?
- A.Root Pressure Theory
- B.Cohesion-Tension Theory
- C.Mass Flow Hypothesis
- D.Imbibition Theory
20.
What is a major functional benefit of transpiration for a plant?
- A.Storing extra carbohydrates
- B.Evaporative cooling and mineral transport
- C.Absorbing carbon dioxide from soil
- D.Building cell walls
21.
What specific electrical event does the QRS complex represent on a standard ECG?
- A.Atrial depolarization
- B.Ventricular depolarization
- C.Ventricular repolarization
- D.Atrial repolarization
22.
What is the total duration of a single standard human cardiac cycle at rest?
- A.0.3 seconds
- B.0.5 seconds
- C.0.8 seconds
- D.1.2 seconds
23.
Which instrument is used by medical professionals to measure arterial blood pressure?
- A.Stethoscope
- B.Barometer
- C.Sphygmomanometer
- D.ECG Machine
24.
During which phase of the cardiac cycle do the heart chambers relax and fill with blood?
- A.Systole
- B.Diastole
- C.Depolarization
- D.Isovolumetric contraction
25.
What does the number 80 represent in a standard blood pressure reading of 120/80 mmHg?
- A.Systolic pressure
- B.Pulse pressure
- C.Diastolic pressure
- D.Mean arterial pressure
26.
Which blood component is primarily responsible for the transport of oxygen?
- A.Platelets
- B.Plasma Albumin
- C.Red Blood Cells
- D.Leucocytes
27.
What is the main structural characteristic of a mature mammalian Red Blood Cell?
- A.Multilobed nucleus
- B.Nucleus and many mitochondria
- C.Lack of a nucleus and biconcave shape
- D.Spherical with long pseudopodia
28.
Which plasma protein plays a direct role in blood coagulation?
- A.Albumin
- B.Fibrinogen
- C.Alpha globulin
- D.Insulin
29.
Megakaryocytes in the bone marrow fragment into which formed elements of blood?
- A.Monocytes
- B.Erythrocytes
- C.Blood Platelets
- D.T-Lymphocytes
30.
Which type of white blood cell is specialized to produce antibodies?
- A.Neutrophils
- B.Basophils
- C.Lymphocytes
- D.Eosinophils
31.
Which antigens are present on the surface of red blood cells in a person with Type O+ blood?
- A.A and B antigens
- B.Rh antigen only
- C.A, B, and Rh antigens
- D.No antigens at all
32.
Who is considered the universal donor for blood transfusions?
- A.AB positive (AB+)
- B.O positive (O+)
- C.AB negative (AB-)
- D.O negative (O-)
33.
What dangerous reaction happens when incompatible blood groups are mixed during a transfusion?
- A.Hemofiltration
- B.Agglutination
- C.Coagulation
- D.Phagocytosis
34.
A person with Type A blood naturally carries which antibodies in their blood plasma?
- A.Anti-A antibodies
- B.Anti-B antibodies
- C.Both Anti-A and Anti-B
- D.No antibodies
35.
Why is Type AB+ blood classified as the universal recipient?
- A.It lacks all clotting factors
- B.It has no antigens on its red blood cells
- C.Its plasma contains no anti-A, anti-B, or anti-Rh antibodies
- D.It contains high levels of albumin
36.
What is the clear fluid called once it leaves tissue spaces and enters lymphatic capillaries?
- A.Plasma
- B.Serum
- C.Lymph
- D.Intracellular matrix
37.
Which lymphatic organs are specialized to filter blood, destroy old RBCs, and act as a blood reservoir?
- A.Lymph nodes
- B.Spleen
- C.Thymus
- D.Lacteals
38.
What are the specialized lymph capillaries located in the intestinal villi that absorb dietary fats called?
- A.Aquaporins
- B.Arterioles
- C.Venules
- D.Lacteals
39.
Where do T-lymphocytes migrate to undergo maturation and select for immune competence?
- A.Thyroid gland
- B.Thymus gland
- C.Spleen
- D.Bone marrow
40.
Into which blood vessels does the lymphatic system empty its fluid to return it to central circulation?
- A.Hepatic portal vein
- B.Subclavian veins
- C.Renal arteries
- D.Inferior vena cava
Answer Key
Section A — Multiple Choice (1 mark each)
- (C) Cytoplasm
- (B) Oxygen
- (D) 2 ATP
- (C) Phosphate groups
- (C) Oxidative Phosphorylation
- (B) Epiglottis
- (B) Both relax
- (C) Residual Volume
- (B) Nasal Cavity $\rightarrow$ Pharynx $\rightarrow$ Larynx $\rightarrow$ Trachea
- (B) 500 mL
- (C) Simple diffusion
- (B) 40 mmHg
- (D) Increase in hydrogen ion concentration (Lower pH)
- (B) Bohr Effect
- (C) It is ultra-thin and highly vascularized
- (C) Stomata
- (C) High relative humidity
- (B) Adhesion
- (B) Cohesion-Tension Theory
- (B) Evaporative cooling and mineral transport
- (B) Ventricular depolarization
- (C) 0.8 seconds
- (C) Sphygmomanometer
- (B) Diastole
- (C) Diastolic pressure
- (C) Red Blood Cells
- (C) Lack of a nucleus and biconcave shape
- (B) Fibrinogen
- (C) Blood Platelets
- (C) Lymphocytes
- (B) Rh antigen only
- (D) O negative (O-)
- (B) Agglutination
- (B) Anti-B antibodies
- (C) Its plasma contains no anti-A, anti-B, or anti-Rh antibodies
- (C) Lymph
- (B) Spleen
- (D) Lacteals
- (B) Thymus gland
- (B) Subclavian veins
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