Free Kingdom Protista MCQs with Answers

211. Sporozoans have:

• A. Both locomotory organelles and contractile vacuoles
• B. Locomotory organelles but not contractile vacuoles
• C. Contractile vacuoles but not locomotory organelles
• D. Neither locomotory organelle nor contractile vacuoles
• E. All are incorrect

Explanation: Sporozoans are a group of protists that are adapted to a parasitic lifestyle. They lack traditional locomotory organelles such as flagella or cilia, which are not necessary for their parasitic mode of life. Additionally, they do not have contractile vacuoles since they rely on their host for osmoregulation. Option D is correct as it accurately reflects these characteristics. The other options incorrectly attribute sporozoans with features they do not possess.

212. Asexual cycle of Plasmodium in man comprises of phases [In order]:

• A. Erythrocytic phase ⟶ Pre-erythrocytic phase ⟶ Gamogony ⟶ Post-erythrocytic phase
• B. Erythrocytic phase ⟶ Gamogony ⟶ Pre-erythrocytic phase ⟶ Post-erythrocytic phase
• C. Pre-erythrocytic phase ⟶ Post-erythrocytic phase ⟶ Gamogony ⟶ Erythrocytic phase
• D. Post-erythrocytic phase ⟶ Pre-erythrocytic phase ⟶ Erythrocytic phase ⟶ Gamogony
• E. Pre-erythrocytic phase ⟶ Erythrocytic phase ⟶ Post-erythrocytic phase ⟶ Gamogony

Explanation: The Plasmodium life cycle in humans starts with the pre-erythrocytic phase, where sporozoites infect liver cells and multiply. It is followed by the erythrocytic phase, characterized by the infection and destruction of red blood cells, causing malaria symptoms. The post-erythrocytic phase entails further development in the blood. Finally, gamogony occurs, where gametocytes form, ready for transmission to a mosquito. Options A, B, C, and D present incorrect sequences that do not correspond to the actual life cycle of Plasmodium in humans.

213. In the Gametogony stage of the sexual cycle male gametocyte forms:

• A. 6 - 8 sperm-like microgametes
• B. 6 - 8 sperm-like macrogametes
• C. 8 - 12 sperm-like microgametes
• D. 5 - 7 sperm-like macrogametes
• E. 12 - 15 sperm-like microgametes

Explanation: During the gametogony stage of the sexual cycle in certain protists, male gametocytes produce several flagellated microgametes, which are sperm-like in structure. These microgametes are essential for fertilization, as they fuse with the larger, non-motile female macrogametes to form a zygote. The correct number of microgametes typically produced is between 6 and 8. Options suggesting macrogametes or incorrect ranges of microgametes are inaccurate as they do not align with the typical biological processes observed in these organisms.

214. Concerning conditions necessary for the production of water molds, which statement is correct?

• A. 50% relative humidity is essential for sporangia production
• B. Sporangia cannot be produced if relative humidity exceeds 70%
• C. Sporangia are typically produced in a fully saturated atmosphere at temperatures between 25°C - 37°C
• D. The optimum temperature for producing sporangia is around 21°C
• E. Sporangia never form in their preferred environmental conditions

Explanation: The correct answer is Option D: 'The optimum temperature for the production of sporangia is 21°C'. Water molds, or oomycetes, have specific environmental preferences for sporangia production, and 21°C is often suitable for some species. Option A is incorrect as 50% humidity is not a universal requirement. Option B is incorrect because high humidity usually favors sporangia production. Option C is not universally applicable, as the temperature range is too broad and not specific to all water molds. Option E is incorrect because sporangia do produce under optimal conditions specific to their environmental needs.

215. Balantidium & Opalina are included in class:

• A. Flagellata
• B. Sarcodina
• C. Sporozoa
• D. Ciliata
• E. Suctoria

Explanation: The correct answer is Ciliata. Balantidium and Opalina are ciliated protozoans, meaning they use cilia for movement and feeding, which is a defining characteristic of the class Ciliata. This distinguishes them from other classes of protozoans like Flagellata, which use flagella; Sarcodina, which use pseudopodia; Sporozoa, which are mostly non-motile; and Suctoria, which use tentacle-like structures instead of cilia in their feeding process.

216. In malaria, the body temperature may rise as high as:

• A. 102°F
• B. 104°F
• C. 106°F
• D. 107°F
• E. 106°C

Explanation: Malaria can cause high fevers as part of its symptomatology, especially in severe cases. A body temperature of 106°F (41.1°C) is indicative of an extreme fever, which can occur during the peak of a febrile paroxysm in malaria. Options like 102°F and 104°F, while high, do not capture the severity possible in malaria-induced fevers. Temperatures like 107°F and 106°C are either dangerously high or impossible for human survival, making them incorrect choices.

217. Which of the following is not a symptom of malaria?

• A. Headache
• B. Muscular pains
• C. Constipation
• D. Chills
• E. Flu-like symptoms

Explanation: Constipation is not a typical symptom of malaria. Malaria commonly presents with symptoms that affect the body's temperature regulation and mimic flu-like conditions, such as fever, chills, headache, and muscular pains. Headache, muscular pains, chills, and flu-like symptoms are all consistent with malaria. Constipation, however, is not usually related to malaria, which primarily impacts the body's febrile and respiratory systems.

218. Concerning 'LAVA' which statement is not correct?

• A. The plant body is called thallus
• B. Sporophyte is thallus with 26 chromosomes
• C. Gametophyte is thallus with 26 chromosomes
• D. Reproduction is by sexual as well as asexual methods
• E. It is found growing along the sea-coasts between high and low tides.

Explanation: The correct answer is Option D: 'Reproduction is by sexual as well as asexual methods.' This statement is typically true for many algae species, which exhibit both reproductive modes. The other options are incorrect because they either present misleading chromosome counts for life cycle stages (Options B and C) or describe general characteristics of algae that do not necessarily pinpoint an incorrect statement about 'LAVA' (Options A and E).

219. Freshwater proteroants pumped out excess water by a special structure called:

• A. Oral groove
• B. Contractive vacuole
• C. Vesicle
• D. Vacuole

Explanation: Freshwater protozoans or Protoctista pump excess water out of their body with the help of contractile vacuole because they do not have an osmoregulatory mechanism like human beings.

220. A Dutch scientist first observed very small creatures in:

• A. Vinegar
• B. Saliva
• C. Rainwater
• D. All of these options are correct

Explanation: Small creatures were first seen by Antony Leeuwenhoek, he called these creatures animalcules.