MCQ practice · SSC Biology Board questions · Chapter 6: Transport in Organisms
Callose affects which of the following?
Think it through first, then pick an option.
- a Water movement
- b CO2 entry
- c Food movement
- d O2 release
Answer and explanation
Correct answer: c Food movement
In winter callose collects in the sieve pores and narrows them, so food movement is obstructed.
Why the other options are wrong
- a Water movement: Water moves in the xylem, whereas callose collects in the phloem sieve tubes.
- b CO2 entry: CO2 enters through the stomata; that is not a job of callose.
- d O2 release: Callose has nothing to do with O2 release.
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