Biology - 1999 ( I.C.S.E)
You are on questions 4 to 7

Section-B  (40 marks)

Q 4 (a) The diagram given alongside represents an experimental set up to demonstrate a vital process Study the same and then answer the questions that follow :

i) Name the process . ii) Define the above named process . iii) What would you observe in he experiment can be set up after an hour or so ? iv) What control experiment can be set up for the above experiment ?

v) Keeping in mind the root hair cell and its surrounding , name the part that corresponds to

(1) Concentrated sugar solution (2) Parchment paper and (3) Water in the beaker
vi) Name any other substance that can be used instead of parchment paper in above experiment .
vii) Mention two advantages of this process to the plant .

Q 4(b) (i) What is meant by 'reflex action ' ?
(ii) State whether the following are simple reflexes , conditioned reflexes , or neither of the two :
1. Sneezing
2. Blushing
3. Contraction of pupil
4. Lifting up a book
5. Knitting without looking
6. Sudden application of brakes without thinking .

Q 5
(a) The figures given below are cross sections of blood vessels .

(i) Identify the blood vessels A , B and C.
(ii) Name the parts labeled 1-4
(iii) Mention two structural differences between A and B .
(iv) Name the type of blood that flows (a) through A , (b) through B.
(v) In which of the above vessels referred to in (iv) above does exchange of gases actually take place?

Q 5(b) Match Column A with the most appropriate term in Column B . Rewrite the correct matching pair.

Q 6 (a) The diagram given below represents a defect of vision of the human eye :

(i) Name the defect .
(ii) What is the effect of this defect on man ?
(iii) Mention two causes for this defect .
(iv) How can this defect be rectified ?
(v) Draw a neat labeled diagram to show that how this defect can be rectified .
(vi) What is the nature of the image that falls on the retina of a normal eye ?

Q 6 (b) A candidate in order to study the importance of certain factors in photosynthesis took a potted plant and kept it in the dark for over 24 hours . Then in the early hours of the morning she covered  one of the leaves with black paper in the centre only. She placed the potted plant in the sunlight for a few hours , and then tested the leaf which was covered with black paper for starch .
i) What aspect of photosynthesis was being investigated ?
ii) Is there any control in this experiment ? If so , state the same .
iii) Why was the plant kept in the dark before the experiment ?
iv) Describe step by step how the candidate proceeded to test the leaf for the presence of
starch .

Q 7(b) Define the following terms :
i) Hormone
ii) Ultrafiltration
iii) Antiseptic
iv) Transpiration .

Previous Questions