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STD 11 - 2. Biology classification — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 2. Biology classification1 Mark
MCQ
The given figure shows the structure of filamentous blue green algae. Nostocwith a structure marked as "$X$". Select the option which shows the correct identification of " $X$ " with its feature.
  • A
    Spores - Reproduction
  • ✓
    Heterocysts - Nitrogen fixation - Nitrogen
  • C
    Pellicle - Recycling of nutrition
  • D
    Mucilaginous sheath - Photosynthesis
✓

Answer

Correct option: B.
Heterocysts - Nitrogen fixation - Nitrogen
b
Heterocysts are pale-yellow, thick-walled cells that are capable of nitrogen fixation and therefore play a major part in the nitrogen cycle.

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