MCQ
Which is true for $CO_2$ concentration
- ✓More in alveolar air than in expired air
- BMore in expired air than in alveolar air
- CMore in inspired air than in expired air
- DMore in inspired air than in alveolar air
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$I.$ Vessel, $II.$ Tracheids, $III.$ Companion cells
$(i)$ Most of them are fresh water organisms found in standing water.
$(ii)$ They have a protein rich layer (called pellicle) which makes their body flexible.
$(iii)$ They have two flagella, a short and a long one.
$(iv)$ Though they are photosynthetic in the presence of sunlight, but in the absence of sunlight they behave like heterotrophs by predating on other smaller organisms. Identify the correct group on the basis of these characters.