ISC Practical Sample Paper

7/26/2019 ISC Practical Sample Paper

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BIOLOGY

Paper - 2

(Practical)

(Three hours)

(Candidates are allowed additional 15 minutes for only reading the paper.

They must NOT start writing during this time)

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Answer all questions.

All working including rough work, should e done on the same sheet as the rest of the answer.

The intended marks for questions or parts of questions are gi!en in rackets" #.

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Question 1 [5]

(a) Cut the floral head (capitulum) of specimen D-41 into two equal (longitudinal) halves.

From one of the halves isolate one outer flower (ray floret) and one central or inner

flower (disc floret). Put these florets on a wet filter paper. Examine the two florets

carefully with the hand lens and descrie the general floral characters of each in

otanical terms.

() !a"e large drawings of the ray floret and also the disc floret. #ael the parts.

(c) $plit open the corolla tue of a disc floret with a fine needle and spread the corolla to

expose the androecium and the upper part of the gynoecium. $tudy with a hand lens the

structure and position of stamens in relation to the style% stigma and petals. !a"e a neat

laeled drawing of the parts found aove the ovary.

(d) &raw the floral diagram of each floret.

(e) 'rite the floral formula of each floret.

(f) o which family does &-* elong +

(g) ,ame three floral characteristic of the specimen which places it the family mentioned in

(f).

(h) 'rite the otanical names of two plants elonging to the said family.


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Question 2 []

(a) !easure and pour ml of solutions % and into three petri dishes provided for

the experiment% and lael them accordingly.

() Cut / strips of a peeled potato measuring approximately * cms 0 . cm 0 . cm.(c) Place the strips on a moist filter paper to prevent drying. !easure and record the exact

length of each strip and fully immerse one in each of the three solutions % and

Cover the petri dishes and leave them as such for / minutes. $how the three petri

dishes to the visiting examiner.

(d) 1fter / minutes% remove the strips from the three solutions and dry them on a filter

paper.

!easure and record their lengths fully in a taulated form.

(e) !ention any other change that might have ta"en place in each strip.

(f) Explain these changes (if any).

(g) From your oservations% suggest the nature of solutions % and .

(h) $tate situations found in the ody of an animal and a plant which are similar to those

found with regards to the potato strips in and .

Question ! [4]

(a) Cut thin sections of &-2 provided with a sharp ra3or or lade. Cut numerous sections

and then select a good section. $tain it with safranin. !ount it in glycerine. hen oserve

it under the lower power of microscope and s"o# $our sli%e to t"e &isitin' eainer*

() !a"e a neat fully laeled drawing of the section.

(c) (i) 4dentify the section.

(ii) 5ive two reasons in support of your answer in c (i)

Question 4 [5]

4dentify the given specimens 1 to E. $tate two reasons to support your answer in each

case. &raw a neat laelled diagram of each specimen.

6ou will not e allowed to spend more than three minutes at each spot. 6ou will hand

over your answer sheets to the supervisor after the last oservation% as this question will

e attempted on separate continuation sheets.


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Question 5

Show the following to the Visiting Examiner for assessment: -

Project [+]

Biology Practical File [!]

&-*7 Capitulum or head of $unflower 89 Cosmos% 89 !arigold of single ray florets.

&-27 Preserved piece of dicot. $tem.

7 /: sucrose solution. 7 : sucrose solution. 7 &istilled water.

$pots7 7 .$. of ovary of mammal

7 Potato osmoscope

7 .$. of spinal cord

7 .$. of dicot. #eaf

7 ;.$. of "idney

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ISC Practical Sample Paper