Free Biodiversity and Variety of Life MCQs with Answers

2941. Which of the following may build coral reefs along with coral animals?

• 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 animals.

2942. The gymnosperms are called 'Naked Seeded' plants because they bear naked:

• 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 leaves. These ovules unlike those of angiosperms are not enclosed but lie naked on the surface of fertile leaves. Antheridia are structures in plants that produce and contain male gametes (sperm). They are not directly related to the term "naked seeded" used to describe gymnosperms. Gymnosperms donot produce fruits, which are the defining characteristic of angiosperms. Archegonia are structures in plants that produce and contain female gametes (eggs). They are not directly related to the term "naked seeded" used to describe gymnosperms.

2943. The integumented indehiscent megasporangium is called:

• 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. Archegonia are structures in plants that produce and contain female gametes (eggs). They are found in bryophytes and some ferns, but not in seed plants. This option is also incorrect. The integumented indehiscent megasporium is called ovule, not megagametophyte.

2944. Pulses are present in the family:

• 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. The pulses belong to the family Fabaceae or leguminosea. The members of this family include sweet pea, pea, legumes, etc. These are leguminous plants. This means that most of them have nodules in their roots that enclose symbiotic bacteria.The family Caesalpiniaceae is another family of flowering plants, but it is not known for producing pulses. The family Gramineae, also known as Poaceae, includes grasses and cereal crops such as wheat, rice, and corn. While these crops are important sources of food, they are not considered pulses.The family Mimosaseae includes many species of trees and shrubs, but it is not known for producing pulses.

2945. Endosperm is formed as a result of:

• 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 flower of the same plant.[C] Double fertilisation involves two sperm cells; one fertilizes the egg cell to form the zygote, while the other fuses with the two polar nuclei that form the endosperm.[D] Cross Pollination, transfer of pollen comes from a flower on a different plant

2946. Name the cyanobacteria which are helpful in fixing atmospheric nitrogen.

• 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. These cells create an anaerobic environment that is necessary for the nitrogenase enzyme complex to function effectively and convert atmospheric nitrogen gas (N2) into ammonia (NH3), which can then be utilized by the organism and other nearby plants.

2947. Which of the following is aerobic bacterium?

• A. Spirochete
• B. E. coli
• C. Cyanobacteria
• D. Pseudomonas

Explanation: Explanation:This option is correct because pseudomonas is an aerobic bacteria. This option is not correct because Spirochete is an anaerobic bacterium. This option is incorrect because E.coli is a facultative anaerobe.This option is also incorrect because cyanobacteria are also anaerobic.

2948. The giant amoebas inhabit mud at the bottom of freshwater ponds and obtain energy from:

• A. Microscopic bacteria
• B. Anaerobic bacteria
• C. Aerobic bacteria
• D. Methanogenic bacteria

Explanation: Explanation:The giant amoebas obtain energy from methanogenic bacteria which reside inside them, giant amoebas inhabit the mud at the bottom of the freshwater ponds where they contribute to degradation of organic molecules.The giant amoebas inhabit mud at the bottom of freshwater ponds and obtain energy from methanogenic bacteria, not from microscopic bacteria.The giant amoebas inhabit mud at the bottom of freshwater ponds and obtain energy from methanogenic bacteria, not from microscopic bacteria The giant amoebas inhabit mud at the bottom of freshwater ponds and obtain energy from methanogenic bacteria, not from aerobic bacteria.

2949. The first microbe to have the genome completely sequenced which was published on July 28th, 1995 was:

• A. Hyphomicrobium
• B. Haemophilus aquaticus
• C. Haemophillus malariae
• D. Haemophillus infulenzae

Explanation: H. influenzae was the first free-living organism to have its entire genome sequenced.

2950. Cell wall structure of a cell of unknown origin was studied and was found to contain a polysaccharide chain linked with short chains of amino acid.What do you think it can be?

• A. Bacteria
• B. Fungi Cell
• C. Algae
• D. Cortex cells

Explanation: Bacterias have their cell walls made from peptidoglycan which is known to have sugars and amino acids as its constituents.