Question

What are non-flowering plants?

Answer 1

Non-flowering plants are called as- mosses, ferns, liverworts and some gymnosperms, angiosperms and algae. The plants which do not bear fruits and seeds are termed to be non-flowering plants. Flowers only exist in flowering or higher plants. algae are the members of polyphyletic clades which are from the photosynthetic eukaryotes.

Complete answer-
As we know, algae is one of the non-flowering plants, Algae reproduction is done through regeneration which comes under sexual methods. Usually, algae reproduce by both sexual and asexual methods but the average time algae take to grow is- $30$ days to $4$ weeks.
Algae grow quickly if provided proper nutrients and habitat while sometimes it depends on species to species. Microalgae can grow double to the size of normal algae and in less than $24$ hours. Other algae-like-macroalgae also known as seaweed have normal size in growth.
By providing plant fertilizer in a particular culture where algae are growing, the fertilizer can provide more nutrients in algae growth and also factors like-sunlight, water, chlorophyll, carbon dioxide are needed like any other green plant.
Ferns are also examples of non-flowering plants- In ferns gametes, prothallus and stages of spore formation takes place. The life stages in ferns are when the sporophyte is released and the structure that produces spores turns into sporangia. They have both asexual and sexual mode for reproduction. Spores are produced in both modes.

Note:
The Lifespan of algae is one- two years. Many algae species reproduce by ordinary cellular division; algae which are small in structure and algae which are larger will undergo spore formation for copy. Algae are being grown because they possess high economic importance such as- food sources, fodder in fish farming and even as a fertilizer.