Respiration and Transportation in Organisms
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Aerobic and Anaerobic Respiration
SubtopicAerobic and Anaerobic Respiration under Respiration and Transportation in Organisms for Grade 7 CBSE.
Preview questions (no answers)
- 1.
During which of these activities is the energy requirement of the body the highest?
A.Sitting
B.Reading
C.Heavy weightlifting
D.Watching TV
- 2.
What is the meaning of the word 'anaerobic'?
A.With air
B.Without air
C.With water
D.With light
- 3.
Even when we are sleeping, our body needs energy to:
A.Keep the heart beating
B.Perform physical exercise
C.Digest large amounts of food
D.Run fast
- 4.
What happens to the carbon dioxide produced during respiration in humans?
A.It is stored in the liver
B.It is used to make food
C.It is exhaled
D.It is converted to oxygen
- 5.
Respiration is considered a vital process because it provides:
A.Oxygen to the lungs
B.Food to the cells
C.Energy for all life processes
D.Carbon dioxide to the plants
- 6.
During heavy exercise, our demand for energy increases. To meet this demand, what happens to our breathing?
A.Breathing stops
B.Breathing becomes slower
C.Breathing becomes faster and deeper
D.Breathing remains unaffected
- 7.
Which of the following is produced during the anaerobic respiration in muscles that can lead to a sensation of fatigue?
A.Acetic acid
B.Ethanol
C.Lactic acid
D.Hydrochloric acid
- 8.
Which of the following is a structural adaptation of the respiratory system in birds to ensure efficient oxygen supply during flight?
A.They have a large number of air sacs connected to their lungs.
B.They breathe through their feathers.
C.They do not have a diaphragm, allowing their lungs to expand indefinitely.
D.They only perform anaerobic respiration while flying.
- 9.
Why does a hot water bath or a massage help in providing relief from muscle cramps after heavy exercise?
A.It helps in the synthesis of more glucose in the muscles.
B.It improves blood circulation, which increases the supply of oxygen and helps in the complete breakdown of lactic acid into and water.
C.It cools down the muscles, preventing any further respiration.
D.It helps the body switch back to anaerobic respiration which is more relaxing.
- 10.
In whales and dolphins, how is the respiratory process managed since they live underwater but possess lungs?
A.They have gills hidden under their fins.
B.They come to the surface and breathe through blowholes located on the top of their heads.
C.They can absorb oxygen directly from the water through their skin.
D.They only breathe once every few days by storing air in their stomach.
Download the worksheet for Respiration and Transportation in Organisms - Aerobic and Anaerobic Respiration to practice offline. It includes additional chapter-level practice questions.
Mechanism of Breathing in Humans
SubtopicMechanism of Breathing in Humans under Respiration and Transportation in Organisms for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Which gas is primarily used by the body to break down food for energy during respiration?
A.Carbon dioxide
B.Oxygen
C.Nitrogen
D.Helium
- 2.
When we inhale, the movement of the diaphragm ______ the space in the chest cavity.
A.Decreases
B.Increases
C.Does not change
D.Eliminates
- 3.
What forms the floor of the chest cavity?
A.The ribs
B.The diaphragm
C.The stomach
D.The lungs
- 4.
During heavy exercise, the breathing rate can increase up to ______ times per minute.
A.10
B.15
C.25
D.50
- 5.
The total surface area provided by all the alveoli in human lungs is approximately equivalent to:
A.A small table
B.A tennis court
C.A classroom floor
D.A football field
- 6.
If you hold your breath for a long time, the first thing that happens in your body is:
A.level in blood decreases
B.level in blood increases
C.Oxygen level in blood increases
D.Heart stops beating
- 7.
Which of the following occurs during exhalation?
A.The diaphragm moves down
B.The ribs move out
C.The volume of the chest cavity decreases
D.Air pressure in the lungs decreases
- 8.
When observing a person taking a deep breath, you may notice that their abdominal (stomach) area moves outward as they inhale. Based on the mechanism of breathing and the provided flowchart, what is the primary anatomical reason for this observation?
A.Because the lungs expand significantly and physically enter the abdominal cavity.
B.Because the downward movement of the diaphragm compresses and displaces the abdominal organs.
C.Because air is simultaneously swallowed into the stomach to help balance internal pressure.
D.Because the rib cage moves downward and inward, pushing the organs in the stomach area forward.
- 9.
A person has a condition where their ribs are fused together and cannot move. How would this specifically impact their breathing mechanism?
A.They would be unable to breathe at all.
B.They would only be able to breathe using their diaphragm, leading to reduced air intake.
C.Their lungs would expand more than usual.
D.The diaphragm would stop moving to match the ribs.
- 10.
Which statement about the percentage of water vapor in exhaled air is correct?
A.Exhaled air is drier than inhaled air.
B.Exhaled air contains more water vapor than inhaled air.
C.Water vapor is only present in inhaled air.
D.The breathing mechanism removes all water from the air before it is exhaled.
Download the worksheet for Respiration and Transportation in Organisms - Mechanism of Breathing in Humans to practice offline. It includes additional chapter-level practice questions.
Human Circulatory System: Blood, Vessels, and Heart
SubtopicHuman Circulatory System: Blood, Vessels, and Heart under Respiration and Transportation in Organisms for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Which chamber of the heart has the thickest muscular wall?
A.Right Atrium
B.Left Atrium
C.Right Ventricle
D.Left Ventricle
- 2.
The heart acts as a 'double pump'. Which two circuits does it handle?
A.Digestive and Respiratory
B.Pulmonary and Systemic
C.Nervous and Muscular
D.Excretory and Skeletal
- 3.
Which of the following is responsible for the defense mechanism of the body?
A.Plasma
B.Red Blood Cells
C.White Blood Cells
D.Platelets
- 4.
The constant thumping felt at the wrist is called pulse. What causes it?
A.Breathing of the lungs
B.Blood flowing in veins
C.Blood flowing in arteries
D.Movement of muscles in the arm
- 5.
In the provided schematic of the heart's internal blood flow, Chambers A, B, C, and D represent the four compartments. Based on the direction of blood flow shown, which chambers represent the 'Ventricles'?
A.Chambers A and C
B.Chambers B and D
C.Chambers A and B
D.Chambers C and D
- 6.
The diagram below illustrates the 'Double Circulation' of blood in the human body. Which of the following pairs of vessels carry blood that is rich in oxygen?
A.Vessel 2 and Vessel 3
B.Vessel 3 and Vessel 4
C.Vessel 1 and Vessel 2
D.Vessel 1 and Vessel 4
- 7.
Which of these is a waste product transported by the blood from the cells to the kidneys?
A.Oxygen
B.Glucose
C.Urea
D.Haemoglobin
- 8.
If a person has a very low count of Red Blood Cells, they often feel tired and breathless. Why is this?
A.Their heart is beating too slowly to circulate nutrients
B.Their blood cannot carry enough oxygen to produce energy in the cells
C.Their white blood cells are consuming all the available energy
D.Their blood has become too watery to flow through the veins
- 9.
Which statement best describes the role of the capillary network in the lungs?
A.To pump deoxygenated blood back to the right atrium
B.To facilitate the exchange of oxygen from the air into the blood and carbon dioxide out of the blood
C.To filter out germs from the blood before it reaches the heart
D.To increase the pressure of the blood before it enters the pulmonary vein
- 10.
The aorta is the largest artery in the body. If the aorta were to lose its elasticity, what would happen?
A.Blood would flow into the heart from the lungs more easily
B.The heart would have to work much harder to pump blood into the stiff vessel
C.The blood would become oxygenated much faster
D.The valves in the heart would stop functioning
Download the worksheet for Respiration and Transportation in Organisms - Human Circulatory System: Blood, Vessels, and Heart to practice offline. It includes additional chapter-level practice questions.
Excretion in Animals and the Human Urinary System
SubtopicExcretion in Animals and the Human Urinary System under Respiration and Transportation in Organisms for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Urine consists of water, urea, and what is the remaining ?
A.Oxygen
B.Sugar
C.Other waste products
D.Blood
- 2.
In the human body, sweat is produced by glands located in the:
A.Kidneys
B.Skin
C.Lungs
D.Liver
- 3.
The process of dialysis is performed when:
A.The heart stops beating
B.The lungs are congested
C.The kidneys fail to function
D.The stomach cannot digest food
- 4.
What is the primary function of the urinary bladder?
A.To produce urine
B.To store urine temporarily
C.To filter blood
D.To transport urine to the kidneys
- 5.
In the context of excretion, what is the role of the renal vein?
A.It carries urine to the bladder.
B.It carries oxygenated blood to the kidney.
C.It carries filtered (deoxygenated) blood away from the kidney.
D.It removes sweat from the skin.
- 6.
What would be the effect of drinking very little water over a long period on the human urinary system?
A.The kidneys would stop producing urea.
B.The urine would become very dilute.
C.The kidneys would have to work harder to excrete waste in less water, potentially forming stones.
D.The bladder would increase in size to store more waste.
- 7.
Which organ in the human body is responsible for filtering out from the blood?
A.Kidney
B.Heart
C.Lungs
D.Bladder
- 8.
Which of the following organisms has the most efficient water-conserving excretory system based on the form of waste produced?
A.Freshwater fish
B.Human being
C.Desert lizard
D.Earthworm
- 9.
If the human body is unable to remove efficiently through the lungs, how does it affect the blood?
A.The blood becomes more alkaline.
B.The blood becomes more acidic, which can be fatal.
C.The blood becomes thicker and harder to pump.
D.The blood stops carrying urea to the kidneys.
- 10.
Why do humans feel more thirsty after eating very salty food?
A.Salt destroys the water molecules in the blood.
B.High salt levels in the blood trigger the brain to signal for water to maintain the correct salt-to-water ratio.
C.Salt blocks the ureters, preventing urine flow.
D.Salt turns into urea, which requires water to be neutralized.
Download the worksheet for Respiration and Transportation in Organisms - Excretion in Animals and the Human Urinary System to practice offline. It includes additional chapter-level practice questions.
Transportation of Water and Minerals in Plants
SubtopicTransportation of Water and Minerals in Plants under Respiration and Transportation in Organisms for Grade 7 CBSE.
Preview questions (no answers)
- 1.
The upward movement of water in plants is primarily driven by:
A.Root pressure and transpiration pull
B.Gravity
C.Wind energy
D.Animal activity
- 2.
Xylem tissue consists of tubes that are ______.
A.Blocked
B.Hollow
C.Solid
D.Full of food
- 3.
Which part of the plant is responsible for picking up water from the soil?
A.Branches
B.Roots
C.Leaves
D.Flowers
- 4.
Water is lost from the leaves in the form of:
A.Ice cubes
B.Liquid drops
C.Water vapor
D.Snow
- 5.
While water is absorbed by osmosis, the uptake of minerals from the soil often requires energy. According to the diagram below, which process occurring in the root cells provides the energy necessary for the transportation of minerals into the plant?
A.Transpiration
B.Photosynthesis
C.Respiration
D.Translocation
- 6.
The force that 'pulls' water up through the xylem is strongest when:
A.The air is very humid and still.
B.The stomata are completely closed.
C.The leaves are actively losing water vapor to the dry air.
D.The plant is kept in a dark room.
- 7.
If a plant's roots are washed and placed in distilled water (pure water with no minerals), the plant will eventually suffer because:
A.It cannot absorb any water.
B.It cannot perform transpiration.
C.It lacks the minerals necessary for making chlorophyll and proteins.
D.Pure water is toxic to plant cells.
- 8.
Which of the following best describes the 'Suction Pull' in plants?
A.It is a positive pressure generated by the roots pushing water up.
B.It is a negative pressure generated by the evaporation of water from leaf cells.
C.It is a magnetic force between the minerals and the leaves.
D.It is the force of the wind pulling water out of the stomata.
- 9.
If a plant's xylem were to be replaced with wider tubes of the same material, what would be the most likely result for the ascent of sap?
A.Water would rise much higher due to lower resistance.
B.The water column would be more likely to break, and capillary action would be less effective.
C.The rate of osmosis in the roots would increase.
D.The plant would be able to live in drier soil.
- 10.
The 'transpiration stream' refers to:
A.The flow of sugar from the leaves to the roots.
B.The continuous movement of water and minerals from the roots to the leaves.
C.The movement of oxygen into the roots from the soil.
D.The shedding of excess water by aquatic plants.
Download the worksheet for Respiration and Transportation in Organisms - Transportation of Water and Minerals in Plants to practice offline. It includes additional chapter-level practice questions.