Every question from this NCERT chapter, with a detailed explanation.
With reference to the composition of blood in humans, consider the following statements: 1. Plasma is the fluid component of blood in which different types of cells are suspended. 2. The red colour of blood is due to a pigment dissolved directly in the plasma. 3. White blood cells (WBC) are responsible for fighting against germs that may enter the body. Which of the statements given above is/are correct?
Which one of the following best explains the primary function of haemoglobin in the blood?
Consider the following statements regarding the clotting of blood: 1. A clot is formed to plug a cut and stop bleeding. 2. The formation of a clot is primarily due to the presence of white blood cells. Which of the statements given above is/are correct?
With reference to blood vessels in the human body, consider the following statements: 1. Arteries always carry carbon dioxide-rich blood from the heart. 2. Veins generally carry carbon dioxide-rich blood from the body to the heart. 3. Arteries have thick elastic walls while veins have thinner walls. Which of the statements given above is/are correct?
With reference to the Pulmonary Artery, consider the following statements: 1. It carries oxygen-rich blood from the lungs to the heart. 2. It is called an artery because it carries blood away from the heart. 3. It carries oxygenated blood to the kidneys. Which of the statements given above is/are correct?
Which of the following statements correctly describes the Pulmonary Vein?
Consider the following statements about veins: 1. They are blood vessels that generally carry carbon dioxide-rich blood. 2. Unlike arteries, they are devoid of any valves. 3. They have thinner walls compared to arteries. Which of the statements given above is/are correct?
In the context of the human circulatory system, what are 'capillaries'?
With reference to the human heart, consider the following statements: 1. It acts primarily as a storage organ for blood. 2. It is located in the chest cavity with its lower tip slightly tilted towards the left. 3. It has four chambers to prevent the mixing of oxygenated and deoxygenated blood. Which of the statements given above is/are correct?
Which of the following pairs is correctly matched regarding the chambers of the heart?
What is the primary function of the septum in the human heart?
Consider the following statements about the heartbeat: 1. The walls of the heart chambers are made of muscles. 2. The contraction and relaxation of these muscles is random and irregular. 3. A doctor uses a thermometer to amplify the sound of the heart. Which of the statements given above is/are correct?
Which of the following best describes the relationship between heartbeat and pulse rate?
With reference to transport in animals like Sponges and Hydra, consider the following statements: 1. They lack a circulatory system with blood vessels. 2. The water entering their bodies carries away food and oxygen. 3. The water carries away waste materials and carbon dioxide as it moves out. Which of the statements given above is/are correct?
Consider the following statements regarding the flow of urine in the human body: 1. Urine flows from the urethra to the urinary bladder. 2. Urine flows from the kidneys into the ureters. 3. Urine is stored in the urinary bladder before being passed out. Which of the statements given above is/are correct?
With reference to the composition of human urine, consider the following statements: 1. It consists of approximately 95% water. 2. It contains approximately 50% urea. 3. It is devoid of any other waste products. Which of the statements given above is/are correct?
In the context of human physiology and medicine, what does the term 'dialysis' refer to?
Consider the following statements regarding sweating: 1. Sweat contains water and salts. 2. Sweating primarily functions to increase body temperature. 3. White patches on clothes in summer are caused by salts present in sweat. Which of the statements given above is/are correct?
Why do aquatic animals, such as fish, primarily excrete nitrogenous waste in the form of ammonia?
With reference to transport in plants, consider the following statements: 1. Plants absorb water and mineral nutrients primarily through their leaves. 2. Root hair increases the surface area of the root for absorption. 3. Root hair is in contact with the water present between the soil particles. Which of the statements given above is/are correct?
Consider the following statements regarding Xylem: 1. It is a vascular tissue in plants. 2. It transports food synthesized by leaves to other parts. 3. It is restricted to the roots and does not reach the leaves. Which of the statements given above is/are correct?
Which one of the following vascular tissues is responsible for the translocation of food from leaves to other parts of the plant?
With reference to 'Transpiration', consider the following statements: 1. It is the process of release of water vapour by plants. 2. It occurs primarily through the root hair. 3. It generates a suction pull that helps in pulling water to great heights. Which of the statements given above is/are correct?
Which of the following is a beneficial effect of transpiration in plants?
Match List I with List II and select the correct answer using the code given below: List I | List II A. Xylem | 1. Absorption of water B. Phloem | 2. Transport of water C. Platelets | 3. Transport of food D. Root hair | 4. Clotting of blood
Consider the following statements about the circulatory system: 1. It consists only of the heart and no other structures. 2. In humans, blood flows through arteries and veins. 3. The heart acts as a pumping organ. Which of the statements given above is/are correct?
With reference to the removal of waste in animals, consider the following statements: 1. Carbon dioxide is removed as waste through the lungs. 2. Undigested food is removed by the kidneys. 3. Toxic waste products are stored in the liver permanently. Which of the statements given above is/are correct?
Consider the following statements regarding the transport of substances in plants: 1. Water moves up the stem through narrow tubes inside the stem. 2. Minerals remain in the roots and do not move up the stem. 3. The stem conducts water to leaves and other plant parts. Which of the statements given above is/are correct?
What is the primary significance of the transpiration pull in plants?
What is the primary physiological consequence if oxygenated and deoxygenated blood mix within the heart?
With reference to the human circulatory system, which vessel carries oxygen-rich blood from the lungs to the heart?
Consider the following statements regarding the excretory system in humans: 1. Useful substances in the blood are permanently excreted along with wastes. 2. The wastes dissolved in water are removed as urine. 3. Kidney failure leads to the accumulation of waste products in the blood. Which of the statements given above is/are correct?
Consider the following statements about the transport of water in plants: 1. Plants have pipe-like vessels made of vascular tissue. 2. The vascular tissue for water transport is called Phloem. 3. The vessels are discontinuous and do not connect roots to leaves. Which of the statements given above is/are correct?
How does the availability of water influence the nature of nitrogenous waste excretion in animals?
Consider the following statements regarding 'Root Hair': 1. They are present on the roots of plants. 2. They decrease the surface area of the root to prevent water loss. 3. They absorb mineral nutrients and water dissolved in soil water. Which of the statements given above is/are correct?
Which of the following is NOT a part of the human excretory system?
What is the likely physiological consequence of a deficiency of platelets in human blood?
Which of the following statements correctly distinguishes between Arteries and Veins?
Which one of the following best describes the nature of a blood clot formed at a wound site?
Consider the following statements about the heart's rhythm: 1. The muscles of the heart remain static without contraction. 2. The rhythmic contraction followed by relaxation constitutes a heartbeat. 3. Heartbeats continue rhythmically even when a person is sleeping. Which of the statements given above is/are correct?
In the context of biological organization, what does the term 'tissue' refer to?
What is the primary role of plasma in human blood?
Consider the following statements regarding the 'Pulmonary Circuit': 1. The pulmonary artery carries blood from the heart to the lungs. 2. The pulmonary vein carries blood from the heart to the kidneys. 3. Both vessels carry oxygen-rich blood. Which of the statements given above is/are correct?
What is the primary function of the urethra in the human excretory system?
Consider the following statements regarding the 'Heart Rate': 1. It is the number of times the heart beats per minute. 2. It is usually higher than the pulse rate. 3. It increases after physical activity like running. Which of the statements given above is/are correct?
With reference to the 'Stomata', consider the following statements: 1. They are large openings present on the roots. 2. They are involved in the process of transpiration. 3. They facilitate the exchange of gases. Which of the statements given above is/are correct?
Consider the following statements about 'Phloem': 1. It is a vascular tissue in plants. 2. It transports water and minerals from roots to leaves. 3. It is responsible for the absorption of sunlight. Which of the statements given above is/are correct?
With reference to the transport of substances in the human body, consider the following statements: 1. Arteries divide into smaller vessels called capillaries. 2. Capillaries join together to form arteries. 3. Veins typically carry blood away from the heart. Which of the statements given above is/are correct?
Which of the following pairs of animals and their excretory products is correctly matched?