Protista and Fungi

Biology, HSSC-KPK First Year. This chapter is split into 23 topics and has 534 practice questions. The topics covered are listed below, followed by 10 free sample questions from the chapter.

Topics in this chapter

1. Introduction to Protista & Classification 24 questions
2. Zooflagellates, Sarcodines & Ciliates 26 questions
3. Apicomplexa & Malaria Life Cycle 24 questions
4. Dinoflagellates & Diatoms 24 questions
5. Brown, Red & Green Algae 26 questions
6. Fungus-like Protists & Importance of Protista 24 questions
7. Kingdom Fungi: Characteristics & Classification 27 questions
8. Importance of Fungi: Industry, Food & Symbiosis 26 questions
9. Pathogenic Fungi: Plant, Animal & Human Diseases 23 questions
10. Protista Overview: Exclusion, Endosymbiosis and Grouping 23 questions
11. Protozoa Groups Compared and Identified 21 questions
12. Zooflagellates and Amoeba in Depth 22 questions
13. Ciliates and Paramecium Structure 20 questions
14. Malaria Parasite Life Cycle Reasoning 29 questions
15. Dinoflagellates and Diatoms: Comparison and Application 20 questions
16. Algae: Brown, Red and Green Comparison and Importance 20 questions
17. Fungus-like Protists and Importance of Protista Applied 21 questions
18. Fungi: Defining Features and Class Overview 21 questions
19. Zygomycota, Ascomycota and Basidiomycota Applied 25 questions
20. Fungi: Medicine, Food, Symbiosis and Recycling Applied 28 questions
21. Fungal Diseases and Chapter Exercise Applied 20 questions
22. Chapter 7 Numerical Applications 20 questions
23. Chapter 7 Review: Protists and Fungi Compared 20 questions

Sample questions: Protista and Fungi

10 sample questions with the correct answer and an explanation. Try to answer each one before reading the explanation.

Q1. According to Fig 7.4, which stage in the malaria life cycle occurs specifically within the mosquito's gut, distinct from the stages occurring in the human host?

From your book: Figure 7.4 (page 151) Full page Open book

• A. Invasion of red blood cells by merozoites
• B. Development of chill and fever symptoms
• C. Formation of merozoites in the liver
• D. Formation of the oocyst from the zygote, and production of sporozoites(correct answer)

Answer: D.The formation of the oocyst from the zygote, and the subsequent production of sporozoites, occurs specifically in the mosquito's mid-gut, distinct from the liver and blood-stage events that occur in the human host.

Q2. If a mosquito bites an infected human but the human's blood contains only asexual merozoite stages (no mature gametes yet), what would be the likely outcome for malaria transmission?

• A. Transmission would still occur normally, since merozoites alone are sufficient
• B. The mosquito would not become infected, since sexual reproduction requires mature gametes(correct answer)
• C. The mosquito would immediately develop malaria symptoms
• D. The human would be cured instantly

Answer: B.Since the mosquito-stage sexual cycle depends on ingesting mature male and female gametes, a bite that transfers only asexual merozoites (not yet gametes) would not lead to successful transmission and completion of the sexual cycle.

Q3. Public health efforts to control malaria often focus on mosquito control (e.g., eliminating breeding sites, using bed nets) rather than only treating infected humans. Based on the life cycle, why is this an effective strategy?

• A. Because mosquito control has no effect on the spread of malaria
• B. Because mosquitoes are the only organisms capable of surviving Plasmodium infection
• C. Because the mosquito is essential for both transmission to new human hosts and for completing the parasite's sexual reproduction cycle(correct answer)
• D. Because humans cannot transmit the parasite to mosquitoes at any life stage

Answer: C.Since the mosquito is required both for transmitting sporozoites to new human hosts and for the sexual reproduction stage of the parasite (zygote-oocyst-sporozoite formation), controlling mosquito populations disrupts the parasite's life cycle at a critical stage.

Q4. Which of the following distinguishes Plasmodium's life cycle from that of a simple free-living protozoan like a typical amoeba?

• A. Plasmodium never reproduces sexually
• B. Plasmodium uses cilia for locomotion, unlike amoeba
• C. Plasmodium alternates between two hosts and undergoes both asexual and sexual reproduction stages(correct answer)
• D. Plasmodium lives independently with no host requirement

Answer: C.Unlike a free-living amoeba which reproduces only asexually by binary fission, Plasmodium has a complex life cycle alternating between two hosts (human and mosquito) and includes both asexual (in humans) and sexual (in mosquito) reproduction.

Q5. Which of the following correctly distinguishes dinoflagellates from diatoms based on their structural features?

• A. Both groups are identical in every structural respect
• B. Diatoms move using flagella, while dinoflagellates are entirely non-motile
• C. Dinoflagellates typically lack a rigid cell wall (or have a cellulose one when present) and move using two unequal flagella, while diatoms have rigid two-part silica shells and lack flagella in the vegetative stage(correct answer)
• D. Dinoflagellates have silica shells, while diatoms have cellulose cell walls

Answer: C.Dinoflagellates generally lack a rigid cell wall (or have a cellulose-based one) and are motile via two unequal flagella, whereas diatoms possess distinctive two-part silica shells and generally lack flagella at the vegetative stage.

Q6. Considering both diatoms and dinoflagellates play a role as primary producers, why would a decline in these organisms be significant for a marine ecosystem?

• A. They have no measurable ecological role
• B. They form the base of many aquatic food chains and contribute significantly to photosynthesis and oxygen production in aquatic ecosystems(correct answer)
• C. They are only decomposers, not producers
• D. They only affect terrestrial ecosystems, not aquatic ones

Answer: B.As photosynthetic plant-like protists, diatoms and dinoflagellates are important primary producers that form the base of aquatic food chains and contribute to photosynthesis and oxygen production in aquatic ecosystems.

Q7. Which of the following correctly summarizes a key distinguishing feature among the three algae groups (brown, red, and green algae) described in the chapter?

• A. Brown algae have air bladders and large thallus (kelps); red algae are colored by phycoerythrin and form coral reefs; green algae are considered ancestors of plants due to starch storage and chlorophyll a/b(correct answer)
• B. All three groups have identical pigments and identical reproductive structures
• C. Brown algae are colored by phycoerythrin; red algae have air bladders; green algae form coral reefs
• D. None of these algae groups perform photosynthesis

Answer: A.Brown algae are characterized by air bladders and large kelp thalli, red algae by phycoerythrin pigment and coral reef formation, and green algae (Chlorophyta) by their plant-like starch storage and chlorophyll a/b, making them considered ancestors of land plants.

Q8. Which fungus-like protist group is characterized by an amoeboid, phagocytic feeding stage (the plasmodium), distinguishing it from Oomycota?

• A. Oomycota (water molds)
• B. Both groups share an identical feeding mechanism
• C. Neither group has any distinguishing feeding stage
• D. Myxomycota (plasmodial slime molds)(correct answer)

Answer: D.Myxomycota (plasmodial slime molds) are distinguished by their amoeboid, phagocytic plasmodium stage, which engulfs food particles — a feature not shared with Oomycota, which absorb nutrients as parasites or saprophytes.

Q9. In basidiomycota, the mycelium exists in three successive forms. What is the correct order of these forms?

• A. Secondary → primary → tertiary
• B. Tertiary → secondary → primary
• C. Primary (monokaryon) → secondary (dikaryotic) → tertiary (forming basidiocarps)(correct answer)
• D. All three forms occur simultaneously with no order

Answer: C.The mycelium in Basidiomycota exists as primary mycelium (monokaryon, unicucleate haploid cells), then secondary mycelium (dikaryotic, formed by interaction with primary mycelium), and finally tertiary mycelium when it becomes complex and gives rise to fruit bodies (basidiocarps).

Q10. Considering the chapter's coverage of both beneficial fungi (antibiotics, food production, symbiosis) and pathogenic fungi (crop disease, human/animal infections), which best characterizes the overall relationship between fungi and other organisms?

• A. All fungi are exclusively harmful with no beneficial roles
• B. Fungi have no meaningful interaction with other organisms
• C. All fungi are exclusively beneficial with no pathogenic species
• D. Fungi have a dual relationship with other organisms, acting as both valuable partners/producers and as significant pathogens depending on the species and context(correct answer)

Answer: D.The chapter demonstrates that fungi have a dual relationship with other organisms — some species provide major benefits (antibiotics, food, symbiosis, decomposition) while others are significant pathogens of plants, animals, and humans.