All Free Biology MCQs with Answers

• A. Cnidaria
• B. Aschelminthes
• C. Annelida
• D. Platyhelminthes

Explanation: Intracellular parasites are endoparasites that live within the cell of the host.

• A. Planaria
• B. Ascaris
• C. Fasciola
• D. Tapeworm

Explanation: Proglottid can be defined as each segment in the strobils of a tapeworm containing a complete sexually mature reproductive system.

• A. Taenia solanum
• B. Schistosoma
• C. Ascaris lumbriocoides
• D. Fasciola hepatica

Explanation: Ascaris belongs to phylum Nematode. It is a parasitic worm. It causes ascariasis disease.

• A. Taenia solium
• B. Wuchereria bancrofti
• C. Ascaris lumbricoides
• D. Schistosoma

Explanation: Ascaris Lumbricoides is a large, parasitic roundworm known for surviving in the human intestine.

• 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…

• 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.

• 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.

• 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…

• 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…

• 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.

• 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…

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

Explanation: The first three options are features of schlerenchyma.

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

Explanation: a) Psilopsida: Psilopsida, also known as whisk ferns, have rootless sporophytes.

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

Explanation: d) Filicineae: Filicineae, also known as ferns, are a class of seedless vascular plants.

• A. Myxomycota
• B. Green algae
• C. Brown algae
• D. Red algae

Explanation: Some red algae incorporate calcium carbonate in their cell walls from the ocean and take part in building coral reefs alongwith coral…

• A. Antheridia
• B. Ovules
• C. Fruits
• D. Archegonia

Explanation: Explanation:The term gymnosperm literally means naked seeds. The ovules in these plants are usually borne on exposed surfaces of fertile…

• A. Seed
• B. Archegonium
• C. Megagametophyte
• D. Ovule

Explanation: Explanation: The integumented indehiscent megasporium is called ovule. The integumented indehiscent megasporium is called ovule, not seed.

• A. Caesalpiniaceae
• B. Fabaceae
• C. Gramineae
• D. Mimosaceae

Explanation: Explanation:This option is correct because family Fabaceae also known as family leguminosea contains legumes and pulses.

• A. Pollination
• B. Self-Pollination
• C. Double Fertilisation
• D. Cross Pollination

Explanation: [A] Pollination is the transfer of pollen grains from male anther of a flower to the female stigma[B] Pollen is transferred from any…

• A. Heterocysts.
• B. Akinetes.
• C. Nostoc.
• D. Hormogonia.

Explanation: Heterocysts are specialized cells found in certain filamentous cyanobacteria that are crucial for the process of nitrogen fixation.