AP BIOLOGY

Detailed explanation-1: -Algae also lack true roots, stems, and leaves-features they share with the avascular lower plants (e.g., mosses, liverworts, and hornworts). Additionally, the algae as treated in this article exclude the prokaryotic (nucleus-lacking) blue-green algae (cyanobacteria).

Detailed explanation-2: -Plants with no roots, but have stem and leaves are Psilotum. They belong to the Pteridophytes. Commonly they are called the whisk ferns, they are considered as primitive pteridophytes as they lack roots.

Detailed explanation-3: -The action of these parts are done by body itself like function of leave in plant is to perform food, algae has chlorophyll and prepare its food by whole body. Most of algae are free floating aquatic so doesnt require roots and they have irregular body shape so there is no need for stem for support.

Detailed explanation-4: -The body of algae is not differentiated into roots, stems and leaves and is also known as thallus.

Detailed explanation-5: -Unlike plants, algae don’t have roots to draw nutrients from the soil. Instead, nutrients are taken directly from the water. Most importantly, like plants, algae use photosynthesis to create and store energy. Algae get credit for their important role in creating the air we now enjoy.