Previous Year Paper year:2009 : ICSE-X-Biology

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ICSE-X-Biology

Previous Year Paper year:2009

with Solutions - page 2

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#1-c [5]
Give the specific function of the following structures found in the body of
plants/animals.

#1-c-i
Hydathodes
Ans : Hydathodes: Bring about the loss of water but in the form of water droplets.

#1-c-ii
Centrosome
Ans : Centrosome: Initiates the cell division in animal cells.

#1-c-iii
Xylem
Ans : Xylem: Conducts water and inineral salts up to the highest part of the leaves.

#1-c-iv
Corpus luteum
Ans : Corpus luteiun : Secretes the hormones such as oestrogen, progesterone and relaxin.

#1-c-v
Eustachian tube
Ans : Eustachian Tube: It equalizes atmospheric pressure and pressure in the ear.

#1-d [5]
Identify and name the following processes/terms from the statements given below:

#1-d-i
Movement of molecules from a region of high concentration to a region of low
concentration.
Ans : Passive transport

#1-d-ii
Mild chemical applied on the skin to kill germs.
Ans : Antiseptic

#1-d-iii
Chromosomes appear thread like.
Ans : Prophase

#1-d-iv [5]
The loss of water from injured parts of a plant.
Ans : Bleeding

#1-d-v
A pair of chromosomes carrying dissimilar alleles for a particular character.
Ans : Heterozygous

#1-e [5]
Classify the following actions as simple reflex or conditioned reflex:

#1-e-i
Playing a guitar.
Ans : Conditioned Reflex

#1-e-ii
Removing your hand suddenly when pricked by a thorn.
Ans : Simple Reflex