(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

Choose the correct answer:

The cause of wilting is more ___________

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Transpiration is more ____________

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In herbaceous plants, following percentage of absorbed water comes out __________

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Transpiration generates __________

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Who had said that "transpiration is a necessary evil"?

An experiment was set up as shown in the figure given below . The twig in the diagram was intact on the plant and it was as such in sunlight for a few hours .

(i) What is the aim of the above experiment ? 
(ii) Why was potassium hydroxide placed inside the conical flask ?
(iii) What test would you perform on the leaf inside the flask?
(iv) What is the expected result of the above test ?
(v) Is it necessary to similarly test on outer leaf also ? Giva a reason .

Describe fully one experiment with potted green plant to show that starch is not produced in the leaves when carbon dioxide is not available (diagrams essential)

A healthy oat seeding in a pot is transferred from light to any airy but completely dark room. How would it differ from its original condition in appearance after about a week? Explain the difference.

Two healthy green plants were placed in the dark for 24 hours. They were then set up, as shown in the figure, for 4 hours. Then a leaf was taken from each plant and
the chlorophyll was removed from the leaves:
( i) What is the next and final step in this experiment?
( ii ) What would be the results of the final step?
( iii ) Why was it necessary to grease the glass sheet?
( iv ) What hypothesis is being tested in this experiment?

Complete the following statement by choosing the correct alternative given below : 

All animals would die on the earth if there was no ______.

Name the following:

The main mineral constituent of chlorophyll.

Fill in the blank:
Land plants obtain their carbon dioxide from the ______.

The diagram is set up to demonstrate an experiment. Pond weed was placed in five water-filled tubes. The experiment was set up as shown in the diagram. The tubes were then left for 24 hours. Write the correct answer out of the five available choices: 

(i) In which tube would you except to find the plant with the least amount of starch? 
(a ) 1 (b) 2 (c) 3 (d) 4 (e ) 5 

(ii) The tube in which most oxygen would be found is 
(a ) 1 (b) 2 (c) 3 (d) 4 (e ) 5 

(iii) The tube in which least carbon dioxide would be found is 
(a ) 1 (b) 2 (c) 3 (d) 4 (e ) 5 

(iv) The tube in which the plant would survive for the shortest length of time is 
(a ) 1 (b) 2 (c) 3 (d) 4 (e) 5 

The diagram alongside refers to an experiment in which the apparatus was set up with the light source 10 cm away from the plant. After 15 minutes the number of bubbles evolved per minute from the cut stem was recorded. The light source was moved to 20 cm away from the plant, left for 15 minutes and the number of bubbles evolved per minute was again recorded. The experiment was repeated with the light source at distances of 40, 60, 80 and 100 cm away from the plant. Plot a graph for the results obtained and answer the following questions.

(i) From the graph it seems likely that the rate of bubbling per minute at 50 cm would have been
(a) 2.0 (b) 2.5 (c) 3.0 (d) 3.5
(ii) The gas produced by the plant during the experiment was
(a) air (b) oxygen (c) carbon dioxide (d) nitrogen (e) hydrogen
(iii)    The gas collected comes due to the breakdown of
(a) glucose (b) starch (c) water (d) air (e) ATP
(iv) If ice cubes were added to the water, the rate of bubble formation would
(a) Stay the same.
(b) Increase because more water is added.
(c) Decrease because the temperature drops.
(d) Decrease because water freezes.
(e) Cannot tell from the information given.
(v) If some sodium bicarbonate is added to the water the rate of bubble formation
(a) Increases because more respiration occurs.
(b) Increases because more photosynthesis occurs.
(c) Increases because the gas becomes less soluble.
(d) Decreases because carbon dioxide acts as a limiting factor.
(e) Decreases because respiration decreases.

Name the following:
The photosensitive pigment present in the rod cells of the retina.

Select the odd one in the following series:
Endolymph, Tympanic membrane, Semi-circular canal, Blind spot.