Qstnid -4-a- The Diagram Below Shows The Excretory System Of A Human Being. Study The Same And Then Answer The Questions That Follow : <Img Class='aligncenter' Src='\examimages/icsepprs/bio12/30307517922_afda8cce3f_o.png' Alt=' 9' Width='277' Height='420'> (A) Name The Parts Labelled 1, 2, 3 And 4. (A) Give The Main Function Of The Parts Labelled 5, 6, 7 And 8. (A) Name The Endocrine Gland Which Could Be Added In The Diagram And State Its Location/position. (B) Briefly Explain The Following : (B) Osmosis (B) Allele (B) Pulse (B) Reflex Action (B) Synapse - Previous Year Paper Year:2012

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ICSE-X-Biology

Previous Year Paper year:2012

with Solutions - page 4

Qstn# 4-a Prvs-Qstn Next-Qstn

#4-a [5]
The diagram below shows the Excretory System of a Human being. Study the same and then answer the questions that follow :
(a) Name the parts labelled 1, 2, 3 and 4. (a) Give the main function of the parts labelled 5, 6, 7 and 8. (a) Name the endocrine gland which could be added in the diagram and state its location/position. (b) Briefly explain the following : (b) Osmosis (b) Allele (b) Pulse (b) Reflex action (b) Synapse
Ans : (a) 1-Posterior Vena Cava
2-Aorta
3-Renal Artery
4-Renal Vein (a) Part 5 : Ureter - Carry urine from kidneys to urinary bladder.
Part 6 : Urinary bladder - Contain the urine till it is released out.
Part 7: Sphincter muscles - Guards the urethra
Part 8: Urethra - Passage through which urine is given out of the body. (a) Adrenal gland. It is located above each kidney in the form of a cap. (b) (b) Osmosis : The process of movement of solvent molecules from a region of low concentration to a region of higher concentration through a semipermeable membrane. (b) Allele - It is one of the alternative form of the same gene responsible for determining contrasting characteristics. (b) Pulse - It is a wave of pressure of blood passing through the arteries as it is pumped out of the heart. (b) Reflex Action : It is a spontaneous, automatic, involuntary response to a stimulus. (b) Synapse : It is the point of contact between the axon endings of one neuron with the dendrites of the other neuron through where the impulse is transmitted from one neuron to the other.

#4-a-i
Name the parts labelled 1, 2, 3 and 4.
Ans : 1-Posterior Vena Cava
2-Aorta
3-Renal Artery
4-Renal Vein

#4-a-ii
Give the main function of the parts labelled 5, 6, 7 and 8.
Ans : Part 5 : Ureter - Carry urine from kidneys to urinary bladder.
Part 6 : Urinary bladder - Contain the urine till it is released out.
Part 7: Sphincter muscles - Guards the urethra
Part 8: Urethra - Passage through which urine is given out of the body.

#4-a-iii
Name the endocrine gland which could be added in the diagram and state its location/position.
Ans : Adrenal gland. It is located above each kidney in the form of a cap.

#4-b [5]
Briefly explain the following :

#4-b-i
Osmosis
Ans : Osmosis : The process of movement of solvent molecules from a region of low concentration to a region of higher concentration through a semipermeable membrane.

#4-b-ii
Allele
Ans : Allele - It is one of the alternative form of the same gene responsible for determining contrasting characteristics.

#4-b-iii
Pulse
Ans : Pulse - It is a wave of pressure of blood passing through the arteries as it is pumped out of the heart.

#4-b-iv
Reflex action
Ans : Reflex Action : It is a spontaneous, automatic, involuntary response to a stimulus.

#4-b-v
Synapse
Ans : Synapse : It is the point of contact between the axon endings of one neuron with the dendrites of the other neuron through where the impulse is transmitted from one neuron to the other.