Free Kingdom Protista MCQs with Answers

131. What are the characteristics of Euglena?

• A. Have animals like characters only
• B. Have plants like characters only
• C. Have both animal and plants like characters
• D. Have bacteria like characters
• E. Have virus like characters

Explanation: "The explanation for this question will be added soon!".

132. What category do slime molds belong to?

• A. Animal - like Protoctist
• B. Bacteria - like Protocist
• C. Plant - like Protocist
• D. Viruses - like Protocist
• E. Fungi - like Protocist

Explanation: "The explanation for this question will be added soon!".

133. In Ulothrix/Spirogyra, reduction division (meiosis) occurs at the time of

• A. Gamete formation
• B. Zoospore formation
• C. Zygospore germination
• D. Vegetative reproduction

Explanation: c. In Ulothrix/Spirogyra, reduction division (meiosis) occurs at the time of zygospore germination.Plant body of Ulothrix and Spirogyra, is gametophytic (haploid), they produce zoogametes (n) which fuses to form zygosporic (2n) diploid, which is a resting spore. Onset of favourable condition zygospore undergoes reductional division, or meiosis to produce zoo­meiospores During this stage of the life cycle, the zygospore, formed by the fusion of gametes, undergoes meiosis to produce new individuals. Other options are explanied below: a. Gamete formation: This is when haploid gametes are produced through mitosis and are later involved in sexual reproduction. d. Vegetative reproduction: This involves the growth and asexual reproduction of the alga, usually through fragmentation of the thallus, which does not involve meiosis..

134. Many blue­green algae occur in thermal springs (hot water springs). The temperature tolerance of these algae has been attributed to their:

• A. Mitochondrial Structure
• B. Importance of homopolar bonds in their proteins
• C. Cell wall structure
• D. Modern cell organization.

Explanation: c. The temperature tolerance of many blue-green algae in thermal springs (hot water springs) is attributed to their cell wall structure. These cell walls are often tough and resistant, which helps protect the algae from extreme temperatures and other environmental factors. This structural feature contributes to their ability to thrive in such extreme environments.Other options are explained below:a. Mitochondrial Structure: This option is not relevant to cyanobacteria. Mitochondria are membrane-bound organelles found in eukaryotic cells and are responsible for energy production through cellular respiration. Cyanobacteria lack mitochondria as they are prokaryotic organisms.b. Importance of homopolar bonds in their proteins: This option is not a recognized factor in the temperature tolerance of cyanobacteria. The structure and stability of proteins are influenced by various bonds, but homopolar bonds are not specifically linked to temperature tolerance in this context.d. Modern cell organization: This option is vague and doesn't directly address the specific structural features of cyanobacteria that contribute to their temperature tolerance. The term "modern cell organization" is not commonly used in the context of bacterial adaptations to temperature.

135. Hyphae of Oomycotes are?

• A. Septate
• B. Aseptate
• C. Semi-septate
• D. All of these

Explanation: The correct answer is that Oomycotes have aseptate hyphae. Unlike true fungi, which often have septate hyphae with cross-walls dividing the hyphae into separate cells, Oomycotes have coenocytic hyphae. This means that their hyphae form a continuous tube-like structure without septa, allowing for the free flow of cytoplasm and multiple nuclei within the same cellular compartment. This structural characteristic is a key differentiator between Oomycotes and true fungi.

136. Which of the following is an example of slime mold?

• A. Physarum
• B. Anabaena
• C. Rhizopus
• D. Phytophthora

Explanation: Physarum is classified as an acellular or plasmodial slime mold, which exhibits a unique life cycle that includes an amoeboid stage where it can move and engulf food particles through phagocytosis. It is distinct from other organisms like cyanobacteria (Anabaena), fungi (Rhizopus), and oomycetes (Phytophthora), which have different structures, life cycles, and ecological roles.

137. How does reproduction take place in ULVA?

• A. Asexual reproduction in Ulva typically involves the formation of motile zoospores.
• B. Sexual reproduction in Ulva results in the formation of a diploid zygote.
• C. Ulva reproduces through the fusion of diploid sporophytes.
• D. In Ulva, sexual plants are diploid gametophytes with 26 chromosomes.
• E. In asexual reproduction, a single parent cell forms multiple diploid zoospores.

Explanation: Ulva, commonly known as sea lettuce, can reproduce both asexually and sexually. Asexual reproduction in Ulva involves the formation of motile zoospores, which are haploid. Sexual reproduction involves the fusion of haploid gametes, resulting in the formation of a diploid zygote. Therefore, Option B is correct as it accurately describes the process of sexual reproduction in Ulva. Other options are incorrect as they either misrepresent the reproductive process or provide inaccurate information about Ulva's reproductive structures and chromosome numbers.

138. All of the following are parasitic protozoans except

• A. Plasmodium
• B. Trypanosoma
• C. Trichonymphas
• D. Entamoeba histolytica

Explanation: This question tests knowledge of parasitology, critical for medical students in infectious disease studies. Trichonymphas is completely correct as it is a symbiotic, not parasitic, protozoan. Other options are parasitic, causing diseases, and selecting them would risk misunderstanding of host-parasite relationships.

139. The vector in case of Trypanosoma

• A. Mosquito
• B. House fly
• C. Tsetse fly
• D. None of these

Explanation: The correct answer is Option C:Tsetse fly. Trypanosoma, the parasitic protozoans that cause diseases like African sleeping sickness and Chagas disease, are transmitted to humans and animals through the bite of the tsetse fly. Mosquitoes, house flies, and none of these are not the vectors for Trypanosoma transmission.

140. Trypanosoma causes in man

• A. Malaria
• B. Sleeping sickness
• C. Dysentery
• D. Polio

Explanation: Trypanosoma is a genus of kinetoplastid protozoa that causes sleeping sickness in humans. This disease is transmitted by the bite of an infected tsetse fly, which is prevalent in parts of Africa. The symptoms of sleeping sickness include fever, headaches, joint pains, and, in its progressed state, disturbances in sleep patterns, which is how the disease gets its name.Malaria, caused by Plasmodium species, is transmitted through the bites of infected Anopheles mosquitoes. Dysentery, typically associated with Entamoeba histolytica, results in severe diarrhea with blood. Polio is an entirely different disease caused by the poliovirus and is not related to protozoan infections.