Introduction
Kingdom Protista includes a diverse group of unicellular eukaryotic organisms. These organisms show wide variation in structure, nutrition and habitat. According to NCERT Class 11 Biology (Biological Classification), protists are mostly aquatic and form a connecting link between plants, animals and fungi. This chapter is highly important for NEET due to direct MCQs.
📑 Table of Contents
- What is Kingdom Protista?
- General Characteristics of Protista
- Habitat of Protists
- Mode of Nutrition in Protista
- Reproduction in Protista
- Importance of Protista
- MCQs on Protista for NEET
- Quick Revision
- Conclusion
What is Kingdom Protista?
Kingdom Protista includes all unicellular eukaryotic organisms which are not included in Plantae, Animalia or Fungi.
NCERT Line:
“Kingdom Protista includes unicellular eukaryotic organisms.”
Protists show characters of both plants and animals, hence they act as a connecting link.
General Characteristics of Protista
1. Cellular Organisation
- Unicellular organisms
- Eukaryotic cell structure
- True nucleus present
- Membrane-bound organelles present
2. Body Covering
- May have cell wall or pellicle
- Cell wall (if present) made of cellulose
3. Locomotion
- Locomotory structures include:
- Cilia
- Flagella
- Pseudopodia
Habitat of Protists
- Mostly aquatic
- Found in freshwater and marine water
- Some are found in moist soil
- Some are parasitic
Mode of Nutrition in Protista
- Autotrophic (photosynthetic)
- Heterotrophic
- Mixotrophic (both autotrophic + heterotrophic)
Example: Euglena is mixotrophic.
Reproduction in Protista
Asexual Reproduction
- Binary fission
- Multiple fission
Sexual Reproduction
- Fusion of gametes
- Syngamy
Importance of Protista
- Primary producers in aquatic ecosystem
- Form base of food chain
- Some cause diseases (e.g. malaria)
MCQs on Kingdom Protista for NEET
Q1. Kingdom Protista includes:
A. Multicellular prokaryotes
B. Unicellular eukaryotes
C. Multicellular eukaryotes
D. Acellular organisms
Answer: B
Q2. Which of the following is mixotrophic?
A. Amoeba
B. Euglena
C. Plasmodium
D. Paramecium
Answer: B
Q3. Protists are mostly:
A. Terrestrial
B. Parasitic
C. Aquatic
D. Aerial
Answer: C
Quick Revision
- Protista → Unicellular eukaryotes
- Nucleus → Present
- Habitat → Mostly aquatic
- Nutrition → Auto / Hetero / Mixotrophic
Conclusion
Kingdom Protista represents a diverse group of unicellular eukaryotes. For NEET aspirants, focusing on their general characters, nutrition and reproduction strictly as per NCERT is essential for scoring questions from Biological Classification.