Sahi hai, angiosperms jaise teak mein xylem vessels bade hote hain, tube ki tarah, jo pani tezi se le jaati hain. Conifers jaise deodar mein tracheids hote hain, chote-chote cells, jo dheere kaam karte hain. Isiliye teak badi tez badhta hai...par main deodar hi lagata hoon. Mere pitaji ne sikhaya tha ki deodar ki lakdi factory ke chimney se nikalne wale dhuein se bhi nahi marti, aur itni factories ke beech, wahi jamega zameen par.
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