Explain different types of elements present in phloem.
Explain different types of elements present in phloem.
The different types of elements present in the phloem are
(i) Sieve tubes - Sieve tubes are slender, tube-like structures composed of elongated thin-walled cells, placed end to end. Their end walls are perforated by numerous pores and are called sieve plates.
(ii) Companion Cells - It is a small thin - walled cell containing dense and very active cytoplasm and large elongated nucleus.
(iii) Phloem parenchyma - These are thin-walled, living cells of parenchyma of phloem. They have two functions, storage and slow lateral conduction of food.
(iv) Phloem Fibre - These are thick-walled, elongated spindled shaped dead cells which posses narrow lumen. They provide mechanical strength to the tissue.
The different types of elements present in the phloem are
(i) Sieve tubes - Sieve tubes are slender, tube-like structures composed of elongated thin-walled cells, placed end to end. Their end walls are perforated by numerous pores and are called sieve plates.
(ii) Companion Cells - It is a small thin - walled cell containing dense and very active cytoplasm and large elongated nucleus.
(iii) Phloem parenchyma - These are thin-walled, living cells of parenchyma of phloem. They have two functions, storage and slow lateral conduction of food.
(iv) Phloem Fibre - These are thick-walled, elongated spindled shaped dead cells which posses narrow lumen. They provide mechanical strength to the tissue.
