Transportation and Excretion
7th Biology
1. Q. Explain form and function of urinary system in man?
Q. 21. Write the two functions of kidneys.
Q.12 What is the significance of dividing heart into different chambers?
Q 13. How do plants absorb water and minerals from soil?
William Harvey was an English physician
was the first to give the details of blood circulation, the properties of blood
and the pumping of blood by the heart.
William Harvey was an English physician
was the first to give the details of blood circulation, the properties of blood
and the pumping of blood by the heart.
1. Q. Explain form and function of urinary system in man?
Urinary system consists of Kidney,
The ureters, the urinary bladder and the urethra.
The
Functions of the Urinary System:
The kidneys regulate blood
volume and composition, help to regulate blood pressure and pH, participate in
red blood cell production and synthesis of vitamin D, and excrete waste
products and foreign substances. The
Nephron tubule is the functional unit of the kidney.
The ureters transport urine
from the kidneys to the urinary bladder.
The urinary bladder stores
urine and expels urine into the urethra,
2. Q. briefly describes the human circulatory system?
The circulatory system is made up of the Blood vessels, heart and Blood that help and control the flow of the blood around the body.
The circulatory system is made up of the Blood vessels, heart and Blood that help and control the flow of the blood around the body.
Heart pump blood around your
body by alternate systole and diastole.
Blood is the connective
tissue that carries food, air, waste product and hormones. it contain fluid
medium called plasma and three types of cell RBC,WBC and Platelets.
There are three distinct
types of blood vessels, namely, arteries, veins and capillaries circulate blood
around body.
3. Q. Describe composition of blood and explain function of its components?
The liquid component of
blood is the plasma which is composed of water. it caries digested food,harmones CO2 etc.
RBC (Erythrocytes) caries oxygenated blood WBC (Leukocytes) Fight against diseases. and platelets help in
blood clotting.
4.Q. What is dialysis? Explain.
Dialysis is the artificial process of getting rid of
waste and unwanted water from the blood by dialysis machines.
Dialysis
machines contain a tank with solution of water glucose and salt. Patient’s
blood allowed passing through solution for removal of waste. the cleaned blood
pumped to vein. The dialysis continues till all blood has been
purified.
5. Q. What is another name for platelets?
Another name for platelets is thrombocytes
Another name for platelets is thrombocytes
Q. 21. Write the two functions of kidneys.
Ans. Osmoregulation and
excretion.
Q. 6. What are
spiracles?
Ans The holes found on
the lateral side of insect‘s body.
Q. 7. Why do
veins have thin walls compared to arteries?
Ans: Veins do not have
thick walls because blood is no longer under pressure but blood emerges from
the heart under high pressure. So arteries have thick walls
Q. 8. What do the
following transport?
a) xylem b phloem
c) pulmonary vein
d) venacava
a) xylem b phloem
c) pulmonary vein
d) venacava
Ans. a) xylem-water and
minerals
b) Phloem- prepared food.
c) Pulmonary vein-oxygenated blood
d) vena cava -deoxygenated blood
Q 9 .Write one
function each of the following components of transport system in human beings.
a) Arteries b) veins c) capillaries
a) Arteries b) veins c) capillaries
Ans. a) Arteries- carry
blood from heart to different parts of body
b) veins-carry blood from different parts of body to the heart.
c) Capillaries-exchange of material between blood and surrounding cells.
Q10. Differentiate between
osmoregulation and excretion
Ans : Excretion is
the elimination of metabolic waste products from the body.
Osmoregulation is
regulating osmotic pressure of the body fluids by controlling the amount of
water and salts in the body
Q.11 Why
is heart known as the pumping organ of the human body?
Ans Heart is the pumping organs of a human
body as it continuously act as a pump for transporting blood to all body parts.
Heart pumps carbon-dioxide rich blood to lungs and oxygen rich blood to rest of
the body.
Q.12 What is the significance of dividing heart into different chambers?
Ans. The
division of heart into different chambers ensures that there is no intermixing
of oxygenated and deoxygenated blood. This ensures a better efficiency of
circulation and transportation of oxygen.
Q 13. How do plants absorb water and minerals from soil?
Ans: Plants absorb water
and minerals from soil by the roots. The root hair absorbs water and dissolved
mineral nutrients from the soil. The roots remain in contact with underground
water.
Q 14. What
do you mean by pulse and pulse rate?
Ans: When
blood flows in arteries, it gives throbbing sensation in arteries. This
throbbing sensation is known as a pulse. The rate of heart beat or throbbing is
known as pulse rate. A person has a pulse rate between 72 to 80 beats per
minute. A
stethoscope is an instrument used to measure the sound heart beat.
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