MCQ
The $CO_2$ concentration at which $C_4$ plants show saturation is about
- ✓$360$ $ppm$
- B$380$ $ppm$
- C$450$ $ppm$
- D$500$ $ppm$
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$(a)$ The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea
$(b)$ Axillary buds form slender and spirally coiled tendrils in cucumber and pumpkin
$(c)$ Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves
$(d)$Rhizophora shows vertically upward growing roots that help to get oxygen for respiration
$(e)$ Subaerially growing stems in grasses and strawberry help in vegetative propagation
Choose the correct answer from the options given below:
Choose the correct option for $A, B$ and $C$ from the given four options to complete the above statement with reference to NCERT textbook