Biology
Given ahead is the diagram of an experimental set up to study the process of transpiration in plants. Study the same and then answer the questions that follow:
(a) Name the colour of dry cobalt chloride paper.
(b) Is the experimental leaf a monocot or a dicot? Give a reason to support your answer.
(c) Why are glass slides placed over the dry cobalt chloride papers?
(d) After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? Give a reason to support your answer.
Answer
(a) Blue.
(b) The experimental leaf is a dicot leaf as it shows reticulate venation and there are more number of stomatal openings on the undersurface of a dicot leaf. Hence, transpiration is more and can be easily observed.
(c) Glass slides are placed over the dry cobalt chloride papers so as to retain the strips in their position.
(d) The cobalt chloride paper on the ventral surface will turn less pink or turns pink in a much longer time while the one on the dorsal surface will turn more pink. This occurs because the dorsal surface has more number of stomata as compared to the ventral surface. As a result, the rate of transpiration is more on the dorsal side than on the ventral side of a dicot leaf.
Related Questions
An outline sketch of a tree is shown in a diagram below. Study the same and answer the questions that follow:
(a) Name and define the phenomenon labelled A in the diagram.
(b) Write the significance of the process mentioned in A for the plants.
(c) What do the direction of arrows in B and C indicate? Name the phenomenon.
(d) Draw a neat and labelled diagram of an opened stomata.
The given figure represents an experiment:
(a) Leaf A was coated with grease on both the surfaces.
(b) Leaf B was coated with grease on the lower surface.
(c) Leaf C was coated with grease on the upper surface.
(d) Leaf D was left without any application of grease.All the four leaves A, B, C and D were left in a room for about 24 hours.
(i) Which leaf dries first? Give reason.
(ii) Which leaf dries last? Give reason.The figure given below represents an experimental set up with a weighing machine to demonstrate a particular process in plants. The experimental set up was placed in bright sunlight. Study the diagram and answer the following questions.
(a) Name the process intended for study.
(b) Define the above mentioned process.
(c) When the weight of the test tubes A and B is taken before and after the experiment, what change is observed? Justify.
(d) What is the purpose of keeping the test tube B in the experimental setup?
(e) What is the purpose of putting oil in the test tube?
Given below is the diagram of an apparatus used to study a particular phenomenon in plants:
(a) Name the apparatus.
(b) What is it used for?
(c) What is the role played by the air-bubble in this experiment?
(d) What is the use of the reservoir?
(e) What happens to the movement of the air-bubble if the apparatus is kept:
- In the dark
- In sunlight
- In front of a fan
Give a reason in each case.