Reproduction in $Spirogyra$ is

Food is stored as floridean starch in Rhodophyceae. Mannitol is the reserve food material of which group of algae?

Which one of the following statements is wrong?

Which of the following is a flagellated alga?

Read the following statements and choose the set of correct statements: In the members of Phaeophyceae,
$A$. 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.
Choose the correct answer from the options given below:

Describe the types of reproduction in red algae (Rhodophyceae).