MCQ
In a vascular bundle, if xylem vessels develop in a centripetal fashion, the xylem is likely to be
- AMesarch
- BCentrarch
- CEndarch
- ✓Exarch
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$(A)$ Tropical latitudes have remained relatively undisturbed for millions of years and thus had a long evolutionary
time for species diversification.
$(B)$ Tropical environments are more seasonal and less predictable than temperates.
$(C)$ There is more solar energy available which contributes to higher productivity.