Biology
Given below are figures (A) and (B) showing open and closed stomatal apertures respectively.
Answer the questions that follow :
(a) When do these stomata open (day/night) ?
(b) What is the condition of the guard cells when the stomata are open (turgid/flaccid) ?
(c) Name the gas taken in and released out through these pores during photosynthesis.
(d) Name the cells of the lower epidermis that contain chloroplasts.
(e) Write two characteristic features of both the inner and outer walls of the guard cells.
Photosynthesis
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Answer
(a) Stomata open during the day.
(b) The guard cells become turgid when stomata are open.
(c) During photosynthesis, the gas taken in through these pores is carbon dioxide, and the gas released is oxygen.
(d) The cells of the lower epidermis that contain chloroplasts are the guard cells.
(e) Characteristic features of inner wall:
- They are thick.
- They are less elastic.
Characteristic features of outer wall:
- They are thin.
- They are more elastic.
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Related Questions
A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagram and answer the questions:
(a) What aspect of photosynthesis is being tested in the above diagram?
(b) Why was the plant placed in the dark before beginning the experiment?
(c) Write a balanced chemical equation to represent the process of photosynthesis.
(d) What will be the result of starch test when performed on leaf A shown in the diagram?
(e) Draw a neat and labelled diagram of a chloroplast.
Given below is the diagram of an experimental set-up:
a. What is the objective of this experiment?
b. Will it work satisfactorily? Given reason.
c. What alteration (s) will you make in it for obtaining expected result?
d. Would you take any step before starting the experiment? Describe this step and explain its necessity.
Draw a neat diagram of the stomatal apparatus found in the epidermis of leaves and label the Stoma, Guard cells, Chloroplast, Epidermal cells, Cell wall and Nucleus.
Given below is the diagram of an experimental set-up (final stage). Study the same and answer the following questions :
(a) What is the main aim of the experiment?
(b) Oxygen gas shown in the experiment is released from which of the raw materials ?
(c) How would you confirm the presence of oxygen gas?
(d) Name the chemical substance which can be added in water to enhance the process/rate of release of oxygen gas.
(e) Draw a neat and labelled diagram of the same experiment for its initial stage.