Write the precise function of
(a) Sieve tube (b) Interfasicular cambium (c ) Collenchyma (d ) Sclerenchyma .

Explanation

(a) Sieve tube :They are the move advanced type of conducting cells are and found in phloem of Angiosperms . They are elongated cells , arranged end to end and functioning to conduct food materials through out the plant . They are a nucleate living cells .
(b) Interfasicular cambium : The parenmatous cells present between vascular Bundles , become meristamatic and form a cambium called Interfasicular cambium .
(c ) Collenchyma :
(1) It is living mechanical tissuee cellwall is composed of cellulose , hemicellulose and pectin .
(2) Collenchyma cells with chloroplasts perform photosynthesis .
(3) They provide mechanical support to the growing parts of the plants such as young stem and petiole of a leaf .
(d) Sclerenchyma :
It is Dead mechanical tissue . Cell wall is made up of lignin. Intercellular spaces are absent .
(1) Fibres are useful in textil and jute industries
(2) Fibres give mechanical support to the plant parts .
(3) Sclerids give mechanical support to the plant parts .