Biology

Plant Biology and Classification

1,796 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

In which of the following plants would metabolism be hindered, if the leaves are coated with wax on their upper surface?

  1. Hydrilla

  2. Lotus

  3. Pistia

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

Lotus is a hydrophyte with floating leaves. Its upper surface naturally has a waxy cuticle that repels water. Adding additional wax coating would block stomata (if present) or interfere with gas exchange and transpiration, thereby hindering metabolic processes. Hydrilla, Pistia, and Vallisneria are also aquatic plants but their leaf structure and metabolic processes are not primarily dependent on the upper surface wax coating in the same way.

Multiple choice

Which of the following is a parasitic alga?

  1. Cephaleuros

  2. Chara

  3. Cladophora

  4. Zostera

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cephaleuros is a parasitic green alga that causes red rust disease on various economic plants including tea, coffee, mango, and pepper. It penetrates host tissues and derives nutrients, causing characteristic red-colored pustules on leaves. Chara and Cladophora are free-living, non-parasitic green algae found in freshwater. Zostera is a marine seagrass (a flowering plant, not an alga) and is not parasitic.

Multiple choice

Which of the following is a pair of larvicidal algae?

  1. Chara and Aulosira

  2. Chara and Chlorella

  3. Aulosira and Chlorella

  4. Pelvetia and Chlorella

  5. Pelvetia and Chara
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, this is correct answer. Chara and Aulosira are larivicidal algae. They do not allow mosquito larva to grow.

Multiple choice

Which of the following is a pair of brown algae?

  1. Gelidium and Fucus

  2. Batrachospermum and Gelidium

  3. Vaucheria and Nostoc

  4. Laminaria and Fucus

  5. Nostoc and Laminaria
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Laminaria is a genus of several species of brown algae, all sharing the common name kelp. Fucus is a genus of brown algae found in the intertidal zones of rocky seashores almost throughout the world.