Free Biodiversity and Variety of Life MCQs with Answers

• A. A-L; B-J; C-M; D-N; E-K
• B. A-K; B-J; C-L; D-M; E-N
• C. A-N; B-L; C-K; D-N; E-J
• D. A-J; B-K; C-N; D-L; E-K

Explanation: (a) : Flagellation is the arrangement of flagella over the body surface of a bacterial cell.

• A. Due to long periods of evolutionary changes
• B. Due to abrupt mutations
• C. Suddenly on earth
• D. By seed dispersal.

Explanation: a. Diversification in plant life appeared due to long periods of evolutionary changes.

• A. Power of adaptability in diverse habitat
• B. Property of producing large number of seeds
• C. Nature of self pollination
• D. Domestication by man

Explanation: Angiosperms have dominated the land flora primarily because of their Power of adaptability in diverse habitats.

• A. Fern and Funaria
• B. Funaria and Ficus
• C. Ficus and Chlamydomonas
• D. Funaria and Pinus

Explanation: a.Seed-producing plants belong to Spermatophyta It includes gymnosperms and angiosperms.

• A. Different sizes of motile sex organs
• B. Same size of motile sex organs
• C. Morphologically different sex organs
• D. Physiologically differentiated sex organs.

Explanation: d. Sexual reproduction in Spirogyra is considered an advanced feature because it shows morphologically different sex organs.

• A. Cryptogams
• B. Bryophytes
• C. Sporophytes
• D. Thallophytes

Explanation: a. Plants that reproduce by spores, such as mosses and ferns, are grouped under the general term "Cryptogams." Cryptogams refer to a…

• A. Acacia, sugarcane
• B. Pinus, Cycas
• C. Rhizopus, Triticum
• D. Ginkgo, Pisum

Explanation: d. Spermatophyta includes seed-bearing plants and this includes gymnosperms and angiosperms. Acacia and sugarcane both are angiosperms.

• A. Presence of vessels
• B. Double fertilization
• C. Secondary growth
• D. Autotrophic nutrition

Explanation: b. Double fertilization is without exception in angiosperms. Double fertilization is a unique and characteristic feature of angiosperms…

• A. Naked ovules
• B. Seems like monocot
• C. Circinate ptyxis
• D. Compound leaves.

Explanation: a. Cycas is not included in angiosperms primarily due to "naked ovules." Angiosperms, or flowering plants, are characterized by enclosed…

• A. Phaeophyta
• B. Rhodophyta
• C. Chlorophyta
• D. Bacillariophyta

Explanation: (b) : The algal Class Rhodophyceae contains a red pigment (r­phycocrythrin) and a blue pigment (r­phycocynin) in the chromatphores.

• A. Spore formation
• B. Spore germination
• C. Gamete formation
• D. Antheridia and archegonia formation.

Explanation: (a) : A fern plant body is sporophytic (2n) and is differentiated into roots, stems, and leaves.

• A. Gymnosperm
• B. Angiosperm
• C. Bryophyta
• D. Pteridophyta

Explanation: The plant group with the largest ovule, largest tree, and largest gametes is Gymnosperms. a.

• A. Multiciliated
• B. Monociliated
• C. Aciliated
• D. Biciliated

Explanation: d. Antherozoids of Funaria are of biciliated type. Biciliated antherozoids have two cilia, which are specialized hair-like structures…

• A. Dominant phase of gametophyte which produces spores
• B. Small sporophyte phase and generally parasitic on gametophyte
• C. Sporophyte is of longer duration
• D. Dominant phase of sporophyte which is parasitic.

Explanation: A.Dominant phase of gametophyte which produces spores: This statement is incorrect for bryophytes.

• A. Pteridophytes
• B. Gymnosperms
• C. Algae
• D. Bryophytes

Explanation: The plants having vascular tissue lacking seeds would be placed in the category of Pteridophytes.

• A. They are thalloid.
• B. They posses archegonia.
• C. They contain chloroplast.
• D. All of these

Explanation: All of these is the correct answer because all three statements are true for bryophytes: They possess archegonia: Bryophytes have…

• A. Liverworts
• B. Pteridophytes
• C. Fern
• D. Funaria

Explanation: a. Dichotomous branching is found in Liverworts. This is a characteristic feature of many liverworts, where the main stem divides into two…

• A. Water is essential for their vegetative propagation
• B. The sperms can easily reach upto egg in the archegonium
• C. Archegonium has to remain filled with water for fertilization
• D. Water is essential for fertilization for their homosporous nature

Explanation: The correct option is: b. The sperms can easily reach up to the egg in the archegonium: Bryophytes, such as mosses, depend on water for…

• A. it propagates vegetatively by its leaf tips
• B. It knows how to walk by itself
• C. Its spores are able to walk
• D. It is dispersed through the agency of walking animals.

Explanation: a. The walking fern (Asplenium rhizophyllum) is named for its unique method of vegetative propagation, which is the correct answer: It…

• A. Chlorella
• B. Nostoc
• C. Spirogyra
• D. Ulothrix

Explanation: a. The alga that is known for being very rich in protein is Chlorella. Chlorella is a green microalga that is often used as a dietary…