Chapter 11-Transportation in Animals and Plants – MCQs (Solved Worksheet)
Question 1- What is the main function of the circulatory system?
A) Digestion of food
B) Transportation of substances
C) Synthesis of nutrients
D) Protection against diseases
Answer- B) Transportation of substances
Explanation- The circulatory system primarily functions to facilitate the transport of essential substances such as oxygen, nutrients, and waste products within the body, ensuring that cells receive necessary substances for metabolism and growth while expelling waste.
Question 2- Which cell component in the blood is essential for efficiently transporting oxygen to all cells in the body?
A) Platelets
B) White Blood Cells
C) Haemoglobin
D) Plasma
Answer- C) Haemoglobin
Explanation- Haemoglobin is present in red blood cells and is crucial for binding with oxygen and transporting it to various parts of the body, facilitating cellular respiration and metabolism.
Question 3- What is the role of platelets in the blood?
A) Fighting infection
B) Transporting oxygen
C) Clotting of blood
D) Removing waste
Answer- C) Clotting of blood
Explanation- Platelets assist in the clotting of blood, preventing excessive bleeding from injuries, and ensuring that wounds are closed, reducing the risk of infection.
Also Check- NCERT Exemplar Solutions- Class 7 Science Chapter – 11-Transportation in Animals and Plants
Question 4- Which blood cells help in fighting against germs that enter the body?
A) Red Blood Cells
B) White Blood Cells
C) Platelets
D) Plasma Cells
Answer- B) White Blood Cells
Explanation- White Blood Cells (WBCs) are a crucial component of the immune system, defending the body against germs, bacteria, and other foreign invaders, ensuring the body’s health and resistance against diseases.
Also Check – Rapid Revision – Class 7 Science- Chapter 11- Transportation in Animals and Plants
Question 5- What substances need to be transported to various parts of organisms’ bodies for survival?
A) Only food
B) Food and oxygen
C) Oxygen and waste
D) Food, water, and oxygen
Answer- D) Food, water, and oxygen
Explanation- For survival, organisms require the transportation of essential substances like food, water, and oxygen to various parts of their bodies, ensuring that cells receive necessary nutrients and gases for metabolic activities.
Question 6-Which vessels in the body are responsible for carrying oxygen-rich blood away from the heart to the rest of the body?
A) Veins
B) Capillaries
C) Arteries
D) Pulmonary Vein
Answer- C) Arteries
Explanation- Arteries are robust and elastic vessels that carry oxygen-loaded blood from the heart, spreading out to all tissues and organs, serving as the primary highways of the circulatory system.
Question 7- What is the primary function of veins in the circulatory system?
A) Carry oxygen-rich blood to tissues
B) Facilitate gas exchange
C) Return deoxygenated blood to the heart
D) Transport blood to the lungs
Answer- C) Return deoxygenated blood to the heart
Explanation- Veins act as return channels, carrying carbon dioxide-rich blood filled with waste materials back to the heart and lungs for purification.
Question 8- Which vessel is an exception by carrying oxygen-poor blood away from the heart?
A) Aorta
B) Pulmonary Artery
C) Vena Cava
D) Pulmonary Vein
Answer- B) Pulmonary Artery
Explanation- The pulmonary artery carries oxygen-poor, carbon dioxide-rich blood from the heart to the lungs, making it exceptional among arteries.
Question 9- What structure in veins prevents the backward flow of blood?
A) Thick muscular walls
B) Elastic tissues
C) One-way valves
D) Capillary networks
Answer- C) One-way valves
Explanation- The veins have one-way valves that ensure blood flows back to the heart efficiently, preventing any backward flow.
Question 10- Where does the most efficient exchange of nutrients and wastes occur in the circulatory system?
A) Arteries
B) Veins
C) Capillaries
D) Heart
Answer- C) Capillaries
Explanation- Capillaries, being the smallest blood vessels and having thin walls, are embedded in body tissues, enabling the intimate and efficient exchange of oxygen, nutrients, and waste materials between the blood and body cells.
Question 11- Which part of the heart receives oxygen-rich blood from the lungs?
A) Right Atrium
B) Right Ventricle
C) Left Atrium
D) Left Ventricle
Answer: C) Left Atrium
Explanation: The left atrium receives oxygen-rich blood from the lungs. The oxygenated blood then moves to the left ventricle, which pumps it out to supply various parts of the body.
Question 12- What is the role of the capillaries in the circulatory system?
A) Carry oxygen-poor blood
B) Pump blood
C) Exchange of materials between blood and cells
D) Prevent backward flow of blood
Answer: C) Exchange of materials between blood and cells
Explanation: Capillaries facilitate the intimate and efficient exchange of oxygen, nutrients, and waste materials between the blood and the body’s cells due to their thin walls.
Question 13 -What characterises the pulmonary artery?
A) Carries oxygen-rich blood to the body
B) Carries oxygen-poor blood to the lungs
C) Carries oxygen-rich blood to the lungs
D) Carries only nutrients
Answer: B) Carries oxygen-poor blood to the lungs
Explanation: Unlike other arteries, the pulmonary artery carries oxygen-poor, carbon dioxide-rich blood from the heart to the lungs for oxygenation.
Question 14 -How is the pulse rate typically measured?
A) Number of breaths per minute
B) Number of heartbeats per minute
C) Blood pressure level
D) Amount of oxygen in blood
Answer: B) Number of heartbeats per minute
Explanation: Pulse rate is defined as the number of heartbeats or pulses felt in one minute, providing an indication of the heart’s activity.
Question 15- Which part of the heart is responsible for pumping oxygen-rich blood to various parts of the body?
A) Right Atrium
B) Right Ventricle
C) Left Atrium
D) Left Ventricle
Answer: D) Left Ventricle
Explanation: The left ventricle of the heart pumps oxygen-rich blood out to various parts of the body, ensuring that the body receives a consistent supply of oxygenated blood.
. Question 16- What do the valves in the heart prevent?
A) Blood flow to the heart
B) Blood from clotting
C) Backflow of blood
D) Blood from circulating
Answer- C) Backflow of blood
Explanation- The valves within the heart prevent the backflow of blood, ensuring a one-way flow, which is crucial for effective circulation throughout the body.
Question17- What is the purpose of the rhythmic contraction and relaxation of the heart muscles?
A) To generate heat
B) To maintain blood pressure
C) To ensure continuous blood flow
D) To facilitate breathing
Answer- C) To ensure continuous blood flow
Explanation- The rhythmic contraction and relaxation of the heart muscles, known as the heartbeat, ensures the continuous flow of blood throughout the body, supplying essential substances like oxygen and nutrients.
Question 18- Why is the stethoscope important in diagnosing heart conditions?
A) It visualises the heart
B) It measures blood pressure
C) It amplifies the sounds of the heart
D) It monitors the heart rate
Answer- C) It amplifies the sounds of the heart
Explanation- The stethoscope is essential because it amplifies the sounds of the heart, allowing doctors to listen more precisely to heartbeats, facilitating accurate diagnostics and effective treatment planning.
Question 19- Which chambers of the heart receive blood?
A) Ventricles only
B) Atria only
C) Both atria and ventricles
D) Neither atria or ventricles
Answer- B) Atria only
Explanation- The atria are the receiving chambers of the heart. The right atrium gets deoxygenated blood from the body, and the left atrium receives oxygenated blood from the lungs.
Question 20- What is the significance of the heartbeat?
A) Indicates body temperature
B) Sign of life and continuous blood flow
C) Measure of blood volume
D) Indicator of respiratory rate
Answer- B) Sign of life and continuous blood flow
Explanation- The heartbeat is a vital sign of life, ensuring the continual flow of blood, oxygen, and nutrients throughout the body, signifying the ongoing cycle of life in the biological realm.
Question 21- What is the primary role of kidneys in the human excretory system?
A) Producing saliva
B) Filtering blood and producing urine
C) Transporting urine to the urinary bladder
D) Expelling urine from the body
Answer- B) Filtering blood and producing urine Explanation- The kidneys are responsible for filtering the blood to remove waste products and excess substances, which are then excreted as urine.
Question 22- Which component of the excretory system is responsible for the temporary storage of urine?
A) Kidneys
B) Ureters
C) Urinary Bladder
D) Urethra
Answer- C) Urinary Bladder Explanation- The urinary bladder acts as a reservoir for the temporary storage of urine until it is expelled from the body.
Question 23- What does dialysis substitute for in the human body?
A) Heart function
B) Lung function
C) Kidney function
D) Liver function
Answer- C) Kidney function Explanation- Dialysis acts as a substitute for the kidneys by filtering the blood and removing waste products when the kidneys are not functional.
Question 24- What percentage of urine is typically water?
A) 50%
B) 75%
C) 95%
D) 85%
Answer- C) 95% Explanation- Typically, urine is about 95% water, with the remaining 5% consisting of urea and various waste residues.
Question 25- Which part of the excretory system facilitates the expulsion of urine from the body?
A) Ureters
B) Kidneys
C) Urinary Bladder
D) Urethra
Answer- D) Urethra Explanation- The urethra is a muscular tube that facilitates the expulsion of urine from the body, acting as the final exit route.
Question 26- Where does the absorption of water and minerals take place in plants?
A) Leaves
B) Stems
C) Roots
D) Flowers
Answer- C) Roots
Explanation- Roots have specialised structures like root hairs that enhance the absorption of water and minerals from the soil, making them the primary site for this function.
Question 27- What is the main product of photosynthesis?
A) Oxygen
B) Glucose
C) Carbon Dioxide
D) Water
Answer- B) Glucose
Explanation- During photosynthesis, plants produce glucose as a primary energy source, utilising water and carbon dioxide as fundamental ingredients.
Question 28- Which vascular tissue is responsible for the transport of synthesised food in plants?
A) Xylem
B) Phloem
C) Root hairs
D) Chloroplasts
Answer- B) Phloem
Explanation- Phloem specialises in transporting the synthesised food from the leaves to various parts of the plant, ensuring distribution of nutrients.
Question 29- What role does xylem play in plants?
A) Transports food
B) Transports water and minerals
C) Involved in photosynthesis
D) Stores water
Answer- B) Transports water and minerals
Explanation- Xylem is specialised vascular tissue that acts like pipes, facilitating the efficient transport of water and minerals from the roots upwards to various parts of the plant.
Question 30- What is the significance of the transportation system in plants for their response to environmental stimuli?
A) It has no significance
B) It aids in the distribution of hormones and signalling molecules
C) It helps in photosynthesis
D) It enhances absorption of water
Answer- B) It aids in the distribution of hormones and signalling molecules
Explanation– The transportation system in plants helps distribute hormones and other signalling molecules, allowing plants to respond effectively to environmental stimuli like light or gravity.
Question 31- What is the primary role of stomata in the process of transpiration?
A) Absorbing sunlight
B) Evaporating water from the leaves
C) Capturing carbon dioxide
D) Producing oxygen
Answer- B) Evaporating water from the leaves
Explanation- The stomata act as gateways for water vapour to exit the plant, playing a crucial role in the evaporation of excess water during transpiration.
Question 32- Which of the following best describes the significance of transpiration in plants?
A) For photosynthesis
B) For reproduction
C) For temperature regulation and water transport
D) For producing fruits
Answer- C) For temperature regulation and water transport
Explanation- Transpiration aids in the temperature regulation of plants by preventing overheating through the evaporation of excess water. It also creates a suction force that helps in transporting water throughout the plant.
Question 33- What creates the suction pull in plants during transpiration?
A) Absorption of water from roots
B) Evaporation of water from leaves
C) Photosynthesis in leaves
D) Gravitational pull
Answer- B) Evaporation of water from leaves
Explanation- The evaporation of water from the leaves creates a vacuum or suction force that enables the plant to draw water upwards from the roots.
Question 34- What does transpiration prevent in plants?
A) Water loss
B) Overheating
C) Carbon dioxide loss
D) Nutrient loss
Answer- B) Overheating
Explanation- Transpiration helps in maintaining the plant’s optimal temperature, preventing the plant from overheating through the evaporation of excess water.
Question 35- Through which part does the majority of water exit during transpiration?
A) Roots
B) Stems
C) Flowers
D) Leaves
Answer- D) Leaves
Explanation- The majority of water exits the plant through the leaves during transpiration. Tiny openings on the leaves, known as stomata, act as gateways for this process.
Also Check – NCERT Solutions for Class 7 Science Chapter 11-Transportation in Animals and Plants
Class 7 Science- Chapter 11- Transportation in Animals and Plants – Complete Notes
