Read the following statements  (i) Collenchyma contains lignin in its wall thickenin
Channel: Doubtnut
Date: 2020-05-03

Read the following statements  (i) Collenchyma contains lignin in its wall thickenings.  (ii) Collenchyma occurs in only aerial parimary parts and s absent from the roots.  (iii) Trichomes are multicellular epidermal outgrowths, which also contain some inner tissues.  (iv) Xylem fibres often occur in metaxylem while they are absent or rare in protoxylem.  which of these are correct?