$A$ student observes an alga containing chlorophyll $a$,$d$,and phycoerythrin. To which group should this alga belong?

In which of the following algal classes are starch and oil present as food storage materials?

The chloroplasts of algae usually lack

The cell wall of $Spirogyra$ is composed of:

Assertion $(A)$: Algae are autotrophic in their mode of nutrition.
Reason $(R)$: Algae contain chlorophyll and other photosynthetic pigments.

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: