Question

According to Whittaker one of the following is most primitive evolutionary group
A Plantae
B Fungi
C Protista
D Monera

Answer 1

Hint:
R. H. Whittaker gave the concept of the five kingdom classification that involved monera, protista, fungi, plante and animalia.

Complete answer:
Option A- Plantae- Plantae includes all types of eukaryotic, multicellular, photosynthetic plants that are found in this biosphere. They consist of a clade that has the flowering plants, conifers, and other gymnosperms, ferns, clubmosses, hornworts, liverworts, mosses, and green algae.

Option B- Fungi- It is known as eukaryotic, non-vascular and non-motile organisms. It’s growth rate is slower than that of bacteria.Fungi grows best in an acidic environment. The Kingdom of Fungi consists of both unicellular and multicellular organisms. Fungi have cell walls made up of complex sugar molecules called chitin. But they do not undergo the process of photosynthesis.

Option-C- Protista- These are simple, unicellular, eukaryotic organisms.Most of the protists can be found in water, some in moist soil and even in the body of human and plants.These organisms consists of a membrane-bound nucleus, endomembrane systems, mitochondria which is used for cellular respiration and some have chloroplasts for photosynthesis.

Option-D- Monera- In kingdom Monera it has organisms such as the archaebacteria, bacteria, cyanobacteria (BGA), and filamentous actinomycetes. These organisms are called unicellular or multicellular prokaryotes. There are different forms of primitive organisms which show that the evolution has occurred in these organisms of Monera much before as compared to the organisms of the other group. It is the only kingdom that has prokaryotes. The most primitive evolutionary group is the Monera group in the five kingdom classification.

Hence, the correct answer to the question is option D “Monera”.

Note:
There are different forms of primitive organisms which show that the evolution has occurred in these organisms of Monera much before as compared to the organisms of the other group. R. H. Whittaker gave this concept.