Question

Which criterias are used for classifying the plants?

Answer 1

The kingdoms of living organisms are classified into five categories. Living organisms are classified into five kingdoms by R.H. Whittaker. He classified living organisms based on cellular structure, mode of feeding, body organization, reproduction, phylogenetic relationship, and other factors. There were five kingdoms: Monera, Protista, Fungi, Plantae and Animalia.

Complete Explanation:
Plantae is the kingdom that encompasses all plants. They are multicellular, eukaryotic, and autotrophic organisms. The cell wall of a plant cell is tough. Plants have chloroplasts, which contain the pigment chlorophyll, which is necessary for photosynthesis.
Plant kingdoms are divided further into subgroups. The following criteria are used to classify the members of the plant kingdom:
I. Plant body: Whether or not a well-differentiated plant body exists. Root, stem, and leaves, for example.
II. Vascular system: The presence or absence of a vascular system for water and other substances transportation. Phloem and Xylem, for example.
III. Seeds: The presence or absence of flowers and seeds, as well as whether the seeds are bare or enclosed in a fruit, are both factors in seed creation.

Additional Knowledge:
Plants were traditionally classified as one of two kingdoms, one of which included all non-animal living creatures, and the other of which included algae and fungi. Fungi and some algae, as well as prokaryotes (the archaea and bacteria), are currently excluded from all existing definitions of Plantae.

Note:
There are approximately $320,000$ plant species, with the vast majority ($260$–$290$ thousand) producing seeds. Green plants produce a significant amount of molecular oxygen and are the foundation of most habitats on the planet. Plants that grow grain, fruit, and vegetables have been domesticated for millennia and serve as essential human foods. Plants have a wide range of cultural and other applications, including ornaments, construction materials, and writing materials, as well as being the source of a wide range of medicines and psychoactive substances.