Fill in the blanks of the following paragraph using just two
words – arteries and veins.
___(a)___ carry oxygen-rich blood from the heart to all parts of
the body and ___ (b)___ carry carbon dioxide-rich blood from
all parts of the body back to the heart. ___ (c)___ have thin
walls and __ (d)___ have thick elastic walls. Blood flows at high
pressure in ___ (e)____. Valves are present in __ (f) ___ which
allow blood to flow only towards the heart. __ (g)___ divide into
smaller vessels. These vessels further divide into extremely
thin tubes called capillaries. The capillaries join up to form
____ (h)_____.
Paheli noticed water being pulled up by a motor-pump to an
overhead tank of a five-storeyed building. She wondered how
water moves up to great heights in the tall trees standing next
to the building. Can you tell why?
Name the process and the organ which helps in removing the
following wastes from the body.
(a) Carbondioxide
(b) Undigested food
(c) Urine
(d) Sweat
Boojho’s uncle was hospitalised and put on dialysis after a
severe infection in both of his kidneys.
(a) What is dialysis?
(b) When does it become necessary to take such a treatment?
(a) Name the only artery that carries carbon dioxide-rich
blood.
(b) Why is it called an artery if it does not carry oxygen-rich
blood?
Paheli uprooted a rose plant from the soil. Most of the root
tips, with root hairs got left behind in the soil. She planted it
in a pot with new soil and watered it regularly. Will the plant
grow or die? Give reason for your answer.
Arrange the following statements in the correct order in which
they occur during the formation and removal of urine in human
beings.
(a) Ureters carry urine to the urinary bladder.
(b) Wastes dissolved in water is filtered out as urine in the
kidneys.
(c) Urine stored in urinary bladder is passed out through
the urinary opening at the end of the urethra.
(d) Blood containing useful and harmful substances reaches
the kidneys for filtration.
(e) Useful substances are absorbed back into the blood.
Name the organ which is located in the chest cavity with its
lower tip slightly tilted towards the left.
What is the special feature present in a human heart which
does not allow mixing of blood when oxygen-rich and carbon
dioxide-rich blood reach the heart?
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