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BiologyClass 10ICSE

It has been found that people living in very high mountains have many more red corpuscles in their blood than people living in plains. Which one of the following best accounts for this phenomenon? (a) the cold climate stimulates the production of red corpuscles to keep the body warm (b) people of high mountains breathe more quickly (c) the low air pressure requires more red corpuscles to supply the body cells with oxygen. (d) The low air pressure in high mountains speeds up the blood circulation so that more red corpuscles are needed

(c) the low air pressure requires more red corpuscles to supply the body cells with oxygen.

BiologyClass 10ICSE

Which blood vessel does not carry any carbon dioxide? (a) Pulmonary artery (b) vena cava (c) hepatic vein (d) pulmonary vein

(d) pulmonary vein

BiologyClass 10ICSE

Which vein brings clean blood from the lungs into the heart? (a) renal vein (b) pulmonary vein (c) vena cava (d) hepatic vein

(b) pulmonary vein

BiologyClass 10ICSE

In which of the following vertebrate group/groups, the heart does not pump oxygenated blood to different parts of the body? (a) Pisces and amphibians (b) amphibians and reptiles (c) amphibians only (d) Pisces only

(d) Pisces only

BiologyClass 10ICSE

Which of the following is the correct path taken by urine in our body? (a) kidney → ureter → urethra → bladder (b) kidney → bladder → urethra → ureter (c) kidney → ureter → bladder → urethra (d) bladder → kidney → ureter → urethra

Kidney → ureter → bladder → urethra

BiologyClass 10ICSE

What prevents the backflow of blood inside the heart during contraction? (a) thick muscular walls of ventricles (b) valves (c) thin walls of atria (d) all of the above

valves

BiologyClass 10ICSE

The blood leaving the tissues becomes richer in: (a) carbon dioxide (b) water (c) hemoglobin (d) oxygen

carbon dioxide

BiologyClass 10ICSE

Blood is pumped from the heart to the entire body by the: (a) lungs (b) ventricles (c) atria (d) nerves

(b) ventricles

BiologyClass 10ICSE

A blood vessel which carries blood back to the heart is: (a) artery (b) vein (c) capillary (d) platelet

(b) vein

BiologyClass 10ICSE

Water absorption through roots can be increased by keeping the potted plants: (a) in the shade (b) in dim light (c) under the fan (d) covered with a polythene bag

(c) Under the fan

BiologyClass 10ICSE

If a patient is put on dialysis, he is most likely suffering from a severe ailment of the: (a) circulatory system (b) respiratory system (c) excretory system (d) digestive system

(c) Excretory system

BiologyClass 10ICSE

One of the following is not a constituent of blood. This one is: (a) red blood cells (b) white blood cells (c) sieve plates (d) platelets

(c) sieve plates

BiologyClass 10ICSE

Which of the following carries substances upwards as well as downwards in a plant? (a) xylem (b) companion cells (c) phloem (d) tracheid’s

(c) phloem

BiologyClass 10ICSE

An animal in which the oxygenation of blood does not take place in the lungs is: (a) cow (b) fish (c) frog (d) fox

(b) fish

BiologyClass 10ICSE

One of the following does not have a nucleus. This one is: (a) red blood cell (b) white blood cell (c) guard cell (d) epidermal cell

red blood cell

BiologyClass 10ICSE

The component of blood which makes chemicals known as antibodies is: (a) platelets (b) white blood cell (c) red blood cells (d) plasma

white blood cells

BiologyClass 10ICSE

(a) What is lymphatic system? What are its function? (b) What is blood pressure? What are the two factors used to express the blood pressure of a person? (c) Name the main nitrogenous waste in the human blood. How is it removed from the blood?

The lymphatic system consists of network of organs, lymph nodes, lymph ducts and lymph vessels in the human body that make and move the lymph from tissues to the bloodstream. Following are the functions of lymphatic system: Collects and transports tissue fluid from the intercellular spaces in all the tissues, back to the veins in the bloodstream. The defense mechanism in the body by killing the germs with the help of lymphocytes present in the lymph nodes and by making antibodies is the key function of the lymphatic system. Blood pressure is the pressure at which the blood is pumped around the body by the It is always expressed in the form of two factors that are called systolic pressure and diastolic pressure. The main nitrogenous waste in the human blood is The kidneys remove the urea from the blood and excrete them in the form of a dilute solution called urine.

BiologyClass 10ICSE

(a) Name the red pigment which carries oxygen in the blood. (a) Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds? (b) How many chambers are there in the heart of (i) an amphibian, (ii) a mammal, and (iii) a fish? (c) Describe the circulatory system in a fish.

Hemoglobin is the red color pigment that carries oxygen in the It is necessary to separate the oxygenated and the deoxygenated blood in mammals and birds as this separation allows a highly efficient supply of oxygen to the blood Humans are warm-blooded animals hence the separation of oxygenated and deoxygenated helps in regulating the body temperature. (i) An amphibian: Has a three-chambered heart, with two auricles and one A mammal has a four-chambered The upper two chambers are called atria and the lower two chambers are called ventricles. A fish has only two chambers in its heart, e. one auricle and one ventricle. A fish has a two-chambered heart with one auricle and one ventricle. Since both the auricle and ventricle remain undivided, only deoxygenated blood passes through it. The deoxygenated blood passes from the ventricles into the gills for oxygenation. The oxygenated blood from the gills is then passed to the body parts of the fish where oxygen is utilized and carbon dioxide enters it, thereby making the blood The deoxygenated blood then returns to the heart to be pumped again into the gills for oxygenation.

BiologyClass 10ICSE

(a) What is blood? Why is it red? (b) State the functions of blood in our body. (c) Name a circulatory fluid in the human body other than blood.

Blood is a red color connective tissue that circulates in our Blood contains plasma, red blood cells, white blood cells and platelets. It is red in color because of the presence of hemoglobin. Following are the functions of blood Transportation of oxygen from lungs to all Brings waste product like carbon dioxide from cells to lungs Fights against diseases and Maintains the body temperature Lymph is a circulatory fluid in human body, other than

BiologyClass 10ICSE

a) What is meant by 'heartbeat'? What is the usual heartbeat rate at rest? (b) What change occurs in heartbeats if a person runs for a while? Why?

(a) Heartbeat is the sound produced when there is contraction and relaxation of the heart. At rest, the human heart usually beats 70 to 72 times per minute. (b) A person's heart beats faster after running for a while or when a person is strained physically. After, the physical strain the person needs more oxygen. Hence the heart pumps faster.

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