Question

Nuclear membrane is absent in
A) Monera
B) Fungi
C) Protista
D) Plantae.

Answer 1

Hint: There are so many classification for the animals and one among was Proposed by the Whittaker, and this includes five kingdoms that are Monera, protista, and fungi, plants, and animals, where among all of those the most primitive one was Monera.

Complete answer:
Among all the kingdoms, Monera is the most primitive kingdom, where it contains all the primitive organisms and the cells of the Monera are prokaryotic.
There are two types of cells found in animals and they are prokaryotic and eukaryotic, where primitive one is prokaryotes as these cells lack all major structures inside the cells, that are nucleus, nuclear membrane, and mitochondria, etc.
The difference between the prokaryotes and Eukaryotes are in Monera the true nucleus is absent and instead of that they contain a single piece of DNA present either in circular or linear form, and it is called a nucleolus. So as the nucleus is absent, the nuclear membrane is also absent.
They are present either as unicellular or multicellular organisms, and some of the examples of the organisms that are included in the kingdom Monera were Archaebacteria, and other bacteria include nitrogen fixing bacteria, cyanobacteria as well as Methanogenic bacteria.
Most of these bacteria are present as symbionts and they can have any type of symbiosis such as mutualism, and parasitism etc. Because of this they do not have major organelles that are mitochondria, as they mostly depend on others for their energy.

Hence, the correct option is A.

Note: Cyanobacteria which is commonly called as blue green algae was previously under the kingdom Plantae, but later, as they are prokaryotes and they do not have the true nucleus, and the nuclear membrane so finally they were kept present under Monera.