No, it is not a herb because sapling is a stage in growth of the plant. A mango sapling would grow into a tree.
Question
Is a mango sapling a herb (it has a green stem like herbs)? Give reasons to support your answer.
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b.
c.
d. 
Now answer the following: (i) Which process is demonstrated in the activity? (ii) When will this activity show better results—on a bright sunny day or a cloudy day?(iii) What will you observe in the polythene bag after a few hours of setting up the activity? (iv) Mention any one precaution you must take while performing this activity.
(i) Label the parts (a), (b), (c) and (d) in the diagram.(ii) What type of venation does the leaf has?(iii) What type of venation is seen in grass leaves?