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 botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

Mycorrhiza is a symbiotic association between

  1. Bacteria and fungi

  2. Algae and fungi

  3. Fungi and roots of higher plants

  4. Blue green algae and roots of higher plants
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Fungi present in the roots of the plants show a symbiotic relationship with each other. 
  • It helps the roots of the plants to absorb more nutrients and water from the soil. 
  • It also helps them obtain better resistance to environmental stresses. In return, plants provide shelter and nutrition to mycorrhiza.
So, option C is the correct answer.
Multiple choice botany seeds - structure and germination what is a seed? seeds seed

Consider the following statements.
a. Orchids are monocotyledonous plants
b. Orchids have only ornamental value
c. All orchids are autotrophs
d. Some orchids are epiphytes
Which of these statements are correct?

  1. $1$ and $2$
  2. $2$ and $3$
  3. $1$ and $4$
  4. $3$ and $4$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Orchids are indeed monocotyledonous plants and many tropical orchids grow as epiphytes on tree trunks for sunlight. However, they have immense ecological and medicinal value beyond just ornamentation, and some orchids (like certain mycoheterotrophic species) are not fully autotrophic.

Multiple choice botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

Which of the following pairs of plant categories and habitat types are correctly matched?
a. Sociophytes- Shady
b. Heliophytes - Sunny
c. Psammophytes - Sandy
Select the correct answer using the codes given.

  1. $1, 2$ and $3$
  2. $1$ and $2$
  3. $1$ and $3$
  4. $2$ and $3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sociophytes (shade-loving), Heliophytes (sun-loving), and Psammophytes (sand-loving) are all correctly matched with their respective habitat preferences.

Multiple choice botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

The correct sequence of plants in hydrosphere is :

  1. $Oak \rightarrow Lantana \rightarrow Volvox \rightarrow Hydrilla \rightarrow Pistia \rightarrow Scirpus$
  2. $Oak \rightarrow Lantana \rightarrow Scirpus \rightarrow Pistia \rightarrow Hydrilla \rightarrow Volvox $
  3. $Volvox \rightarrow Hydrilla \rightarrow Pistia \rightarrow Scirpus \rightarrow Lantana \rightarrow Oak$
  4. $Pistia \rightarrow Volvox \rightarrow Scirpus \rightarrow Hydrilla \rightarrow Oak \rightarrow Lantana$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The hydrosere succession typically moves from submerged plants (Volvox, Hydrilla) to floating plants (Pistia), then to reed-swamp stages (Scirpus), and finally to terrestrial stages (Lantana, Oak).

Multiple choice botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

Plants which grow in shade are called

  1. Sciophytes

  2. Heliophytes

  3. Oxylophytes

  4. Epiphytes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sciophytes are plants that are adapted to grow in low-light or shaded conditions. Heliophytes prefer full sun, while Oxylophytes grow in acidic soil.

Multiple choice botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

The most effective defence of plants against herbivores are

  1. Morphological

  2. Chemical

  3. Temporal

  4. Developmental
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To counter the herbivore attack, plants produce specialized morphological structures or secondary metabolites and proteins that have toxic, repellent effects on the herbivores. Plants confront the herbivores both directly by affecting host plant preference or survival and reproductive success (direct defense), and indirectly through other species such as natural enemies of the insect pests (indirect defense). Direct defenses are mediated by plant characteristics that affect the herbivores biology such as mechanical protection on the surface of the plants (e.g., hairs, trichomes, thorns, spines, and thicker leaves) or production of toxic chemicals such as terpenoids, alkaloids, anthocyanins, phenols, and quinones) that either kill or retard the development of the herbivores.

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

"Patther phul" is _______________.

  1. Lichen

  2. Xerophytic plant

  3. Living stones

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

"Patther phul" or stone flower or rock moss is a xerophytic plant or xerophytic shrub occurring wild on rocky ground( not much water present) As it is a plant which needs very little water it is called a xerophyte and occurs in the region of Gujarat 

So, the correct answer is 'Xerophytic plant'.

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

What is wrong about xerophytes?

  1. Sunken stomata

  2. Small spiny leaves

  3. Thick cuticle

  4. Larger number of stomata
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Xerophytes minimize water loss by reducing the number of stomata or having them sunken. A larger number of stomata would increase transpiration, which is detrimental to a plant in a dry habitat.

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

A non-succulent xerophyte with thick leathery leaves having white sticky waxy coating is

  1. Nerium

  2. Calotropis

  3. Bryophyllum

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

Calotropis is a non-succulent xerophyte that features thick, leathery leaves covered in a white, waxy, or hairy coating to reduce water loss and reflect sunlight.

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

Which ones develop characteristics of xerophytes?

  1. Hydrophytes

  2. Sciophytes

  3. Heliophytes

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

Halophytes grow in saline environments where water uptake is difficult due to high salt concentrations, leading to physiological drought. Thus, they often develop xerophytic adaptations.

Multiple choice biology adapting to a habit extreme adaptations adaptive features adaptations of organisms

Heliophytes differ from sciophytes in having

  1. Shorter internodes and thicker leaves

  2. Longer internodes and thinner leaves

  3. Shorter internodes and thinner leaves

  4. Longer internodes and thicker leaves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Heliophytes (sun plants) typically exhibit adaptations to high light intensity, including thicker leaves to store more chlorophyll and shorter internodes to maintain a compact structure. Sciophytes (shade plants) generally have thinner leaves to maximize light absorption in low-light conditions and longer internodes to reach for light.