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$R$- These factors are regulate the activity of enzyme
$(1)$ Decomposition is largely an oxygen -requiring process.
$(2)$ Warm and moist environment slow down decomposition process.
$(3)$ Decomposition rate is slower if detritus is rich in lignin and chitin
$(4)$ Humus is colloidal in nature it serves as are servoir of nutrients.
$A$. Asexual reproduction occurs usually by biflagellate zoospores.
$B$. Sexual reproduction is by oogamous method only.
$C$. Stored food is in the form of carbohydrates which is either mannitol or laminarin.
$D$. The major pigments found are chlorophyll $a$, $c$ and carotenoids and xanthophyll.
$E$. Vegetative cells have a cellulosic wall, usually covered on the outside by gelatinous coating of algin.
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