11

Q1. Water evaporates from the pores of the potted plant and causes

• Melting
• Freezing
• Cooling
• Heating

Solution

Water evaporates from the pores of the potted plant to cause a cooling effect for the plant.

Q2. One complete contraction and relaxation of the heart is called

• Systole
• Diastole
• Cardiac cycle
• Joint diastole

Solution

One complete sequence of part contraction and relaxation is called cardiac cycle.

Q3. How much blood is present in the body of an average human adult?

• 7.6 litres
• 5.5 litres
• 6.5 litres
• 8.6 litres

Solution

The body of an average adult human being contains approximately 5.5 litres of blood.

Q4. The average heartbeat of an adult person at rest is

• 68-70 beats per minute
• 72-80 beats per minute
• 72-74 beats per minute
• 74-76 beats per minute

Solution

The average heartbeat of an adult person at rest is 72-80 beats per minute.

Q5. Which type of plants have a well-developed vascular system?

• Flowering plants
• Non-flowering plants
• Pteridophytes 
• Bryophytes

Solution

Flowering plants have a well-developed vascular system because they are highly modified plants which require conduction of water, minerals, food and hormones.

Q6. Some land animals excrete a semi-solid paste called

• Ammonia
• Urea
• Uric acid
• Urine

Solution

Some land animals excrete wastes in the form of a semi-solid paste called uric acid.

Q7. How many chambers are present in the human heart?

• Two
• Three
• Four
• Five

Solution

The human heart has four chambers; two atria and two ventricles.

Q8. Oxygenated blood is transported to the body through the

• Aorta
• Pulmonary vein
• Pulmonary artery
• Venacava

Solution

The main artery called aorta carries oxygenated blood from the heart to all the parts of the body.

Q9. Heart is a muscular organ made of 

• Cardiac muscles
• Skeletal muscles
• Smooth muscles
• Striated muscles

Solution

Heart is a muscular organ made of cardiac muscles.

Q10. Which substance is present in ascent of sap other than water?

• Lipids
• Minerals
• Vitamins
• Proteins

Solution

Water and minerals are absorbed by the roots from the soil. The movement of water and minerals together is called ascent of sap.

Q11. Which of the following correctly denotes the pathway for the transport of food in plants?

• Flowers → Other plant parts
• Stem → Other plant parts
• Roots → Other plant parts
• Leaves → Other plant parts

Solution

Food gets transported from the leaves to all the other parts of the plant through the phloem.

Q12. Where is the heart located?

• Chest cavity
• Alimentary canal
• Below the pancreas
• Abdominal cavity

Solution

The heart is located in the chest cavity slightly towards the left side between the two lungs and above the diaphragm.

Q13. What is the function of the chambers of the heart?

• Transport of waste materials
• Transport of oxygen
• Rhythmic contraction and relaxation of the heart
• Prevent mixing of oxygenated and deoxygenated blood

Solution

The function of the chambers of the heart is to prevent the mixing of oxygenated and deoxygenated blood in in the heart.

Q14. Each heartbeat generates one pulse in the

• Capillaries
• Veins
• Arteries
• Tissues

Solution

Each heartbeat generates one pulse in the arteries.

Q15. Blood vessels which carry oxygen-rich blood from the heart to all the parts of the body are called

• Veins
• Arteries
• Capillaries
• Arterioles

Solution

Arteries carry oxygen-rich blood from the heart to all the parts of the body.

Q16. Which of the following processes helps in the upward movement of water and dissolved minerals from the roots to the leaves through the stem?

• Guttation
• Translocation
• Bleeding
• Transpiration

Solution

Transpiration is the process by which excess water is lost from the aerial parts of the plant. This loss of water from the leaves of the plant causes a pull to be generated that helps the roots to absorb water from the soil. The water is then transported to the leaves through the xylem.

Q17. Which of the following is the nearest and richest source of raw material for plants?

• Sunlight
• Water
• Soil
• CO₂

Solution

Plants are in direct contact with the soil. They absorb all the important nutrients from the soil through the roots.

Q18. What is the function of the heart muscles?

• Transport of waste materials
• Transport of oxygen
• Rhythmic contraction and relaxation of the heart
• Fight against diseases

Solution

The function of the heart muscles is to bring about rhythmic contraction and relaxation of the heart.

Q19. Which blood cell forms a clot?

• Corpuscle
• Platelet
• RBC
• WBC

Solution

Platelets form a blood clot and stop further bleeding in case of a cut or a wound.

Q20. Blood is a/an

• Epithelial tissue
• Endothelial tissue
• Connective tissue
• Meristematic tissue

Solution

Blood is a liquid connective tissue.

Q21. Which of the following is not a part of the stethoscope?

• Chest piece
• Ear pieces
• Rubber tube
• Mouth piece

Solution

A stethoscope consists of a chest piece, two ear pieces and a rubber tube. The chest piece is placed on the chest to hear the heartbeats. The tube helps to transmit the sound of the heartbeat to the ear pieces. The sound can be heard with the help of ear pieces.

Q22. Which of the following stores urine?

• Ureter
• Urethra
• Urinary bladder
• Kidney

Solution

Urinary bladder stores urine and passes it out of the body at regular intervals through the urethra.

Q23. The vascular tissue which transports food in plants is

• Epidermis
• Mesoderm
• Xylem
• Phloem

Solution

Phloem carries food from the leaves to all the parts of the plant.

Q24. Blood vessels which carry carbon dioxide-rich blood from all parts of the body back to the heart are called

• Veins
• Arteries
• Capillaries
• Arterioles

Solution

Veins carry carbon dioxide-rich or deoxygenated blood from all parts of the body back to the heart for oxygenation.

Q25. The number of heartbeats per minute indicates

• Pulse rate
• Heartbeat rate
• Blood flow rate
• Blood pressure rate

Solution

The number of heartbeats per minute is called pulse rate or heart rate.

Q26. Blood tastes salty due to the dissolved

• Sodium nitrate
• Ammonium nitrate
• Sodium chloride
• Potassium chloride

Solution

Presence of salts such as sodium chloride makes the blood salty.

Q27. The mechanism that cools the plants in hot weather is

• Excretion
• Transportation
• Transpiration
• Translocation

Solution

Transpiration allows evaporation of water from the leaves and keeps the plants cool in hot weather.

Q28. Which pigment imparts red colour to the blood?

• Xanthophyll
• Chlorophyll
• Phycobillin
• Haemoglobin

Solution

Haemoglobin present in the red blood cells imparts red colour to the blood.

Q29. Blood pressure is measured with the help of a 

• Barometer
• Hygrometer
• Manometer
• Sphygmomanometer

Solution

Blood pressure is measured with the help of an instrument called sphygmomanometer.

Q30. Which of the following blood cells imparts colour to the blood?

• Corpuscles
• Platelets
• RBCs
• WBCs

Solution

Red blood cells or RBCs contain a pigment called haemoglobin due to which the blood appears red in colour.

Q31. Which system in the human body is involved with the removal of toxic waste?

• Circulatory system
• Excretory system
• Nervous system
• Respiratory system

Solution

Excretory system helps in the removal of waste products from the body.

Q32. The major excretory product in humans is

• Ammonia
• Urea
• Uric acid
• Guanine

Solution

The major excretory product in humans is urea.

Q33. The valve present between the left auricle and the left ventricle is called

• Semilunar valve
• Bicuspid valve
• Tricuspid valve
• Pulmonary valve

Solution

The valve present between the left auricle and the left ventricle is called bicuspid valve.

Q34. When the chest piece of a stethoscope is kept on the chest, some thumping sound can be heard. This sound indicates

• Pulse
• Heartbeat
• Heart rate
• Blood pressure

Solution

The thumping sound heard through a stethoscope indicates a heartbeat.

Q35. Birds excrete

• Ammonia
• Urea
• Uric acid
• Urine

Solution

Birds excrete wastes in the form of uric acid.

Q36. The white patches formed on our clothes during summer are due to the presence of

• Acids in sweat
• Bases in sweat
• Salts in sweat
• Sugars in sweat

Solution

Salts present in the sweat form white patches on the clothes when the water present in the sweat evaporates.

Q37. What forms a continuous network of channels that connects roots to the leaves through the stem and branches to transport water to the entire plant?

• Stomata
• Guard cells
• Xylem
• Phloem

Solution

Xylem forms a continuous network of channels that connects roots to the leaves through the stem and branches to transport water to the entire plant.

Q38. Which blood cell fights against germs which enter our body?

• Corpuscle
• Platelet
• RBC
• WBC

Solution

WBC's fight against germs which enter our body and protect us from diseases.

Q39. The loss of water from the aerial parts of the plant during daytime is called

• Transpiration
• Guttation
• Bleeding
• Capillary action

Solution

The loss of water from the aerial parts of the plant during daytime is called transpiration.

Q40. Which of the following is not true with respect to kidneys?

• They are a pair of bean-shaped reddish brown organs.
• They help in maintaining water and salt concentration of blood.
• They have an outer cortex and an inner medulla.
• They are involved in the digestion of food.