Biology

Plant Biology and Classification

1,473 Questions

Plant Biology and Classification deals with the taxonomy, evolution, and morphological features of the plant kingdom. This collection offers practice questions on plant groups, taxonomic hierarchies, and specific plant characteristics. The questions are tailored for students preparing for biology competitive exams.

Plant taxonomyPteridophytesAngiospermsPlant morphologyAlgae and bryophytesClassification systems

Plant Biology and Classification Questions

Multiple choice

___________ is the largest plant cell.

  1. Funaria

  2. Acetabularia

  3. Nostoc

  4. Colocasia
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Acetabularia, a single-celled marine green alga, holds the record for being the largest unicellular organism, with some species reaching up to 5 centimeters in length. Despite being a single cell, it has a complex structure with a cap, stalk, and rhizoid. Funaria is a moss, Nostoc is a cyanobacterium forming colonies, and Colocasia (taro) is a multicellular plant.

Multiple choice

Which of the following hierarchial categories is the topmost taxonomical category?

  1. Species

  2. Genus

  3. Class

  4. Kingdom
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the hierarchical biological classification system, Kingdom is the broadest category, encompassing all related organisms. The hierarchy from broadest to most specific is: Kingdom → Phylum → Class → Order → Family → Genus → Species. Humans belong to Kingdom Animalia, Phylum Chordata, Class Mammalia, etc.

Multiple choice

Hydrilla is an example of

  1. submerged hydrophyte

  2. floating hydrophyte

  3. swamp plant

  4. emergent plant

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, it is correct.

Multiple choice

The family Ephedraceae, having ephedrine producing plants, belongs to

  1. Algae

  2. Bryophytes

  3. Gymnosperms

  4. Angiosperms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ephedraceae is a family of gymnosperms that includes the genus Ephedra, which produces ephedrine. They are non-flowering seed plants with naked seeds, classified in the division Gnetophyta within gymnosperms, not algae, bryophytes, or angiosperms.

Multiple choice

Ginkgo resembles ferns having

  1. non-motile sperms

  2. many-ciliated spermatozoids

  3. no ventral canal cell in the archegonia

  4. reticulated leaves
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Ginkgo resembles ferns having reticulated leaves.

Multiple choice

Which one of the following hydrophytes has its roots fixed in mud and leaves floating on water ?

  1. Ceratophyllum

  2. Najas

  3. Trapa

  4. Utricularia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Trapa (water chestnut) is a floating-leaf hydrophyte - its roots are fixed in mud at the bottom, while leaves float on the water surface. Ceratophyllum, Najas, and Utricularia are submerged hydrophytes that float freely or are completely underwater without roots anchored in mud.

Multiple choice

Which of the following is correct sequence in hierarchy?

  1. Phylum, Class, Family, Species, Order

  2. Species, Genus, Family, Order, Class

  3. Species, Genus, Phylum, Family, Class

  4. Class, Family, Species, Genus, Order
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The correct taxonomic hierarchy from specific to general is: Species → Genus → Family → Order → Class → Phylum → Kingdom. Option B correctly lists Species, Genus, Family, Order, Class in hierarchical order.