Question 3(b)Differentiate between the following pairs on the basis of what is mentioned in brackets:(i) Natality and Mortality (definition)(ii) Stoma and Stroma (describe its structure)(iii) Acromegaly and Cretinism (symptoms)(iv) Transpiration and Guttation (structures involved)(v) Diabetes mellitus and Diabetes insipidus (reason/cause) [5]

Question

Accepted Answer

(i) Difference between Natality and Mortality (definition)

Natality	Mortality
The total number of live births per 1000 people of population per year is called birth rate or natality.	The total number of deaths per 1000 people of population per year is called death rate or mortality.

(ii) Difference between Stoma and Stroma (describe its structure.)

Stoma	Stroma
A stoma is a microscopic pore surrounded by two specialized guard cells found in the leaves and stems. Its main function is gaseous exchange.	Stroma is the colourless ground substance found in the chloroplast. It is the site of the light independent reactions of photosynthesis.

(iii) Difference between Acromegaly and Cretinism (symptoms)

Acromegaly	Cretinism
Overgrowth of certain parts of the body like cheek bones etc, due to oversecretion of growth hormone in adults.	Dwarfism and mental retardation due to under secretion of thyroxine in children.

(iv) Difference between Transpiration and Guttation (structures involved)

Transpiration	Guttation
Transpiration occurs from Stomata/cuticle/lenticels.	Guttation occurs from Hydathodes.

(v) Difference between Diabetes mellitus and Diabetes insipidus (reason/cause)

Diabetes mellitus	Diabetes insipidus
Undersecretion of insulin due to which level of glucose increases in blood.	Undersecretion of Antidiuretic hormone due to which reabsorption of water from kidney tubules becomes less.

Solved 2012 Question Paper ICSE Class 10 Biology — Question 4

Question 3(b)