Previous Year Paper year:2019 : ICSE-X-Biology

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ICSE-X-Biology

Previous Year Paper year:2019

with Solutions - page 6

#4-a
The diagram given below represents an organ system in the human body. Study the same and answer the questions that follow :
[5]

#4-a-i
Identify the system.
Ans : Urinary / Excretory system

#4-a-ii
Label the parts marked 2 and 4. Mention the function of part 5.
Ans : 2 - Left Ureters

4 - Sphincter muscle

5 - Urine is expelled from urinary bladder through urethra.

#4-a-iii
Name the structural and functional units of the part marked 1.
Ans : Nephron

#4-a-iv
What is the fluid that accumulates in part 3? Which is the main nitrogenous waste present in it?
Ans : Urine; main nitrogenous water present in it is urea.

#4-a-v
Draw a neat, labelled diagram showing the longitudinal section of part 1.
Ans :

#4-b
The diagram given below represents an endocrine gland in the human body. Study the diagram and answer the following questions :
[5]

#4-b-i
Identify the endocrine gland. Where is it located?
Ans : Pituitary gland.

Location - Hangs from the base of midbrain below hypothalamus of brain.

#4-b-ii
Why is the above gland referred to as the ‘Master gland’?
Ans : Because it controls practically all other endocrine gland.

#4-b-iii
Name the hormone which in deficiency causes Diabetes Insipidus. How does this disorder differ from Diabetes Mellitus ?
Ans : Antidiuretic hormone ; Its deficiency causes diabetes insipidus (hypoglycemia). Insufficient secretion of insulin causes diabetes mellitus (hyperglycemia). It passes sugar in urine.

#4-b-iv
Explain the term ‘Hormone’.

What is the role of Tropic hormones in the human body?

Ans : Hormone is the secretion from some glandular part of the body which is poured directly into blood and which acts on target organs or cells of same individual, bringing about coordination between distant parts of the body.

Tropic hormones stimulate other endocrine gland to produce their specific hormone.

#4-b-v
Which lobe of the above gland secretes :

Oxytocin
ACTH
Growth hormone
Answer:
Ans :
Posterior lobe
Anterior lobe
Anterior lobe

#5

#5-a
Given below is an apparatus which was set up to investigate a physiological process in plants. The setup was placed in bright sunlight. Answer the questions that follow :
[5]

#5-a-i
Identify Australopithecus and Neanderthal man from the above pictures.
Ans : Transpiration, It is the loss of water in the form of water vapour from aerial exposed parts of plants.