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Mark the Most Appropriate Answer in the Following: In the Mechanism of Opening and Closing of Stomata, the Important Factor is - Biology

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Question

Mark the most appropriate answer in the following:
 In the mechanism of opening and closing of stomata, the important factor is

Options

  • The presence of chloroplast in the guard cells

  • The turgid and flaccid state of the guard cells

  • The protein content of the cells

  • The starch content of the cells

MCQ

Solution

The turgid and flaccid state of the guard cells

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Types of Transpiration
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Chapter 4: Transpiration - Multiple Choice Questions

APPEARS IN

ICSE Biology [English] Class 10
Chapter 4 Transpiration
Multiple Choice Questions | Q 1

RELATED QUESTIONS

Name the following:  

Any two parts of a leaf which allow transpiration.


Explain typical structure of stomata.

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 question that follow:

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.


The apparatus shown in the following diagram is Garreau’s potometer designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. Before keeping the leaf in between the cups, anhydrous calcium chloride (CaCl2) contained in two small vials were weighed and placed in both the cups. The ends of the cups were closed with corks through which two mercury manometers were connected. After few hours, CaCl vials were taken out and weighed again.

What is the purpose of using a manometer?


Differentiate Between Stomata and Hydathodes.


The diagram below represents a structure found in a leaf.

Study the same and answer the questions that follow:

(i) Name the pis labeled A and B.
(ii) What is the biological term for the above structure?
(iii) What is the function of the part labeled A?
(iv) Mention two structural features of A, which help in the function mentioned in (iii) above.
(v) Where is this structure likely to be found in a leaf?
(vi) The above structure helps in the process of transpiration. Explain the term transpiration.
(vii) How many other cells are found surrounding this structure as seen in the diagram?


Given below 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:



(i) What is the colour of dry cobalt chloride paper?
(ii) Is the experimental leaf a monocot or a dicot? Give a reason to support your answer.
(iii) Why axe glass slides placed over the dry cobalt chloride papers?
(iv) 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.
(v) Define the term ‘transpiration’.


Name the following:

A potometer is an instrument for measuring the rate of the most transpiration in a herbaceous plant like Balsam occurs through which part.


The upper layer of mesophyll in a leaf consists of elongated ground tissue called ______.


The given figure represents an experiment:

  1. Leaf A was coated with grease on both surfaces.
  2. Leaf B was coated with grease on the lower surface.
  3. Leaf C was coated with grease on the upper surface.
  4. Leaf D was left without any application of grease. All four leaves A, B, C and D were left in a room for about 24 hours.
    1. Which leaf dries first? Give reason.
    2. Which leaf dries last? Give reason.

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