All Free Biology MCQs with Answers

1751. Which of the following statement about filicinae a group of tracheophytes is incorrect_________________?

• A. They belong to sphenopsida
• B. They are seedless and their leaves are called fronds
• C. They live in shady and moist areas.
• D. They show circinate vernation.

Explanation: Filicinae are ferns, generally placed among Pteropsida or related fern groups, not Sphenopsida, which contains horsetails. The likely alternative is b, seedless plants with fronds, but that is a correct feature of ferns and is not the incorrect statement.

1752. The simplest of all bryophytes are___________?

• A. Thallophytes
• B. Embryophytes
• C. Mosses
• D. Liverworts

Explanation: Liverworts are generally regarded as the simplest or most primitive major group of bryophytes, with a simple gametophyte body. The likely alternative is c, mosses, because mosses are the most familiar bryophytes, but they usually have a more differentiated leafy gametophyte.

1753. The arrangement of unequal dichotomous branches in one plane during evolution of leaves is called_____________?

• A. Overtopping
• B. Fusion
• C. Webbing
• D. Planation

Explanation: Planation is the arrangement of branches into one plane during the evolutionary development of megaphylls. The likely alternative is a, overtopping, which concerns unequal branching, but it does not specifically describe placing the branches in one plane.

1754. Mosses are included in sub-division of ___________?

• A. Anthoceropsida
• B. Hepaticopsida
• C. Bryopsida
• D. Lycopsida

Explanation: Mosses belong to the subdivision Bryopsida, whereas Hepaticopsida contains liverworts and Anthocerotopsida contains hornworts. The likely alternative is b, Hepaticopsida, because both mosses and liverworts are bryophytes, but they are separate subdivisions.

1755. Megaphylls i.e. leaves with divided veins with an expanded lamina is a dharacteristic of ___________________?

• A. Lycopods
• B. Ferns
• C. Seed plants
• D. Both b and c

Explanation: Megaphylls have a broad lamina and a branched vein system, and they occur in both ferns and seed plants. The likely alternative is c, seed plants alone, but excluding ferns ignores the classic megaphyllous fern leaves.

1756. Sporophyte is____________?

• A. Monoploid
• B. Haploid
• C. Diploid
• D. Polyploidy

Explanation: The sporophyte develops from the fusion of two haploid gametes, so it has two chromosome sets and is diploid. The likely alternative is b, haploid, because spores are produced by the sporophyte, but spores become haploid through meiosis and are not the sporophyte itself.

1757. The zygote formed in liverworts is___________?

• A. Unicellular
• B. Mulicellular
• C. Multinucleate
• D. None of these

Explanation: Immediately after fertilization, the liverwort zygote is one diploid cell inside the archegonium; it later divides to form the multicellular sporophyte. The likely alternative is b, multicellular, because the developing embryo becomes multicellular, but the zygote itself begins as a single cell.

1758. Production of two types of spores is known as________________?

• A. Heterospory
• B. Homospory
• C. Heterogamy
• D. Gamospory

Explanation: Heterospory is the production of two different kinds of spores, usually microspores and megaspores, which form male and female gametophytes. The likely alternative is b, homospory, but homosporous plants produce only one type of spore.

1759. Which of the following statement about alternation of generation in bryophytes is incorrect?

• A. It involves alternation of morphologically different generations
• B. Their gametophyte is independent while sporophyte depends upon gametophyte for nutrition.
• C. Both the gametophyte and sporophytes are haploid generations thus can produce haploids gametes to continue the diploid number on fertilization
• D. Spore formation occurs through meiosis

Explanation: In bryophytes, the gametophyte is haploid and the sporophyte is diploid, so they are not both haploid generations. The likely alternative is b, because the sporophyte depends nutritionally on the gametophyte, but that statement is correct and does not create the error.

1760. In bryophytes fertilization takes place in___________?

• A. Antheridia
• B. Archegonia
• C. water
• D. Ovule

Explanation: Bryophyte sperm swim through a film of water to reach the archegonium, where fertilization occurs in the venter containing the egg. The likely alternative is c, water, because water is essential for sperm movement, but it is the medium rather than the site of fertilization.