Question

Organisms without nucleus and cell organelles belongs to
A. Fungi
B. Protista
C. Algae
D. Bacteria

Answer 1

Hint: The primitive cells which are not well developed and do not have special organs for various functions. They are said to be the first life form that occurs on the earth surface.

Complete answer:
Bacteria are the biological cells that belong to the group of prokaryotic organisms. They were the first life form that appears on the earth and this does not contain nucleus and cell organelles like eukaryotic organisms.

Additional Information: -The branch of microbiology which deals with the study of bacteria is known as bacteriology.
-Bacteria were among the first life forms to appear on the earth, and are found in almost all the habitats.
-Bacteria are found in almost all the habitats and have various shapes and sizes.
-The bacteria are present in the largest amount in the gut and the skin of the animals and humans.
-The cells lack any membrane and membrane-bound cell organelles. They do not have a true genetic material instead consisting of DNA which is composed of single circular bacterial chromosomes. All the genetic material is arranged irregularly and is found in the nucleoid.
-The nucleoid consists of the chromosome with its associated proteins and RNA.
-Bacteria usually lack large membrane-bound organelles like the nucleus, mitochondria, chloroplast, etc.

-They help recycle various nutrient cycles mostly in the nitrogen fixation in plants from the atmosphere.
-They may cause severe diseases like anthrax, tuberculosis in animals and humans both.
-The fossil of the bacteria is known as stromatolites that bell in the study of bacterial evolution history and morphology.
-Bacterial cells are mostly spherical which is called cocci, or rod-shaped, called bacilli, some of them may be comma-shaped called vibrio, while some may be spiral-shaped called spirilla.

So, the correct answer is ‘Bacteria’.

Note: The word bacteria is taken from the Latin word bacterium, which originates from the Greek word bakterion, meaning ‘staff, cane'. The name was based on the first discovered bacteria which was a rod-shaped bacteria. The prokaryotes have two groups of organisms that evolved due to evolution, they were Bacteria and Archaea