Free Biodiversity and Variety of Life MCQs with Answers

2931. A four-chambered heart with a right systemic arch only is present in?

• A. Amphibians
• B. Reptiles
• C. Birds
• D. Mammals

Explanation: A four-chambered heart with a right systemic arch is present in BirdsBirds have a unique circulatory system in which they possess a four-chambered heart with complete separation of oxygenated (left side) and deoxygenated (right side) blood, but they have a right systemic arch. This adaptation allows them to meet the high oxygen demands of their active lifestyles, such as flying. Mammals (Option D) also have a four-chambered heart, but they typically have a left systemic arch. Amphibians (Option A) and reptiles (Option B) generally have three-chambered hearts with varying degrees of mixing of oxygenated and deoxygenated blood.

2932. In general, asexual reproduction is common in:

• A. Humans
• B. Basidiomycota
• C. Deuteromycota
• D. Basidiospores

Explanation: Deuteromycota commonly reproduce via asexual reproduction throught the conidia; a sexual phase has not yet been observed. Basidiomycota mainly sexually reproduce through basidiospores; asexual reproduction is uncommon. Humans cannot reproduce asexually.

2933. Name the nutrition resulted by feeding on dead and decaying matter.

• A. Saprophytic.
• B. Symbiotic.
• C. Parasitic.
• D. Both B and C.

Explanation: Saprophytes are living organisms that live and feed on the remains of other organisms i.e on dead and decaying organisms.

2934. Penicillin is obtained from:

• A. Penicillium notatum
• B. Aspergillus fumigatus
• C. Aspergillus flavus
• D. Penicillium chrysogenum

Explanation: Penicillium notatum is the fungus from which Alexander Fleming first isolated penicillin in 1928, marking a groundbreaking advancement in the treatment of bacterial infections. While Penicillium chrysogenum is used in industrial production today due to its higher yield of penicillin, Penicillium notatum remains historically important for its initial role in antibiotic discovery. Aspergillus fumigatus and Aspergillus flavus are unrelated to penicillin production, with the former being a pathogen and the latter a producer of harmful toxins.

2935. Which one of the following fungi causes vaginal thrush?

• A. Candida
• B. Aspergillus
• C. Tortula
• D. Penicillium

Explanation: Option [A] Most thrush is caused by Candida albicans. This fungus exists naturally in the vagina,mouth, bowel and elsewhere.So right option is A.Option [B] Aspergillus causes fungal infection of usually the lungs.Option [C] Tortula is a fungus which adds a smoky,umami flavor to foods.Option [D] Penicillium sp.[blue,green molds] are wide spread saprotrophic species common on decaying fruit,bread etc

2936. _ is the yeast that grows in the mucous membrane of the mouth or vagina.

• A. Candida albicans
• B. Saccharomyces cerevisiae
• C. Aspergillus fumigatus
• D. Aspergillus flavus

Explanation: Candida albicans, an opportunistic pathogenic yeast is a common member of the human mouth and vaginal flora.

2937. Chitin, a chemical found in exoskeleton of arthropods is also found in cell wall of:

• A. Bacteria
• B. Fungi
• C. Cyanobacteria
• D. Algae

Explanation: Chitin is a substance made from fibrous polysaccharides. They are famously known for being used to construct the cell walls of eukaryotic Fungi.

2938. Which of the following belong to collenchyma cells?

• A. Fibers.
• B. Vessels.
• C. Sclereides.
• D. None of these.

Explanation: The first three options are features of schlerenchyma.

2939. Which of the following has rootless sporophytes?

• A. Psilopsida.
• B. Lycopsida.
• C. Tracheophyta.
• D. Sphenopsida.

Explanation: a) Psilopsida: Psilopsida, also known as whisk ferns, have rootless sporophytes. Sporophytes are the diploid stage in the plant life cycle that produces spores. In whisk ferns, the sporophytes lack true roots.

2940. Name the class that contains seedless plants.

• A. Angiospermae.
• B. Gemnospermae.
• C. Paraphsys.
• D. Filicineae.

Explanation: d) Filicineae: Filicineae, also known as ferns, are a class of seedless vascular plants. They reproduce via spores and do not produce seeds. While they are seedless, the term "Filicineae" is more commonly used to refer to the fern family rather than a class.