Concept explainers
Introduction:
Stomata refers to the tiny openings that are present in plants for the process of gaseous exchange. Guard cells are specialized cells which guide the process of opening and closing of stomata. Cuticle refers to the protective covering commonly seen in aerial plants.
Answer to Problem 1MCQ
Correct answer:
The feature that is not common to land plants and green algae is the presence of cuticle and stomata. Hence, the correct answer is option d.
Explanation of Solution
Reason for correct answer:
Option d. is given as, “The presence of cuticle and stomata.”
The green algae do not contain highly developed structures like the advanced lands plants; therefore, it does not possess cuticle and stomata that are present in land plants.
Reason for incorrect answer:
Option a. is given as, “Photosynthesis.”
Photosynthesis is present in both green algae and land plants as they both contain the pigment chlorophyll that helps in the process. Hence, option a. is incorrect.
Option b. is given as, “Starch as a form of stored energy.”
Starch is stored in both land plants as well as in green algae, as both of them synthesis glucose through photosynthesis which converts to starch and is stored in different parts. Hence, option b. is incorrect.
Option c. is given as, “Cellulose cell walls.”
The characteristic feature of plants is the presence of a cell wall which is also shared by green algae. These cell walls help to maintain rigidity in the cell. Hence, option c. is incorrect.
Hence, the options a., b., and c. are correct.
The structures like cuticle and stomata are absent in green algae as their structures are not well adapted to the terrestrial habitat and are therefore primitive than land plants. Thus, the correct answer is option d.
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Chapter 16 Solutions
BIOLOGY: THE ESSENTIALS
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