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 biology classification of plants thallophyta cryptograms kingdom plantae

Which of the following statements are incorrect about thallophyta?

(i) Sex organs are unjacketed and one-celled gametangia.
(ii) The vascular system is well developed.
(iii) An embryo stage is absent.
(iv) The plant body is differentiated into root, stem, and leaves.

  1. (i) and (iii)

  2. (i) and (iv)

  3. (ii) and (iii)

  4. (ii) and (iv)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Thallophyta: salient features are- most primitive and simple plants. They do not possess a vascular system. The plant body is not differentiated into stem roots and leaves. The whole plant body remains in the form of an undivided mass of cells called thallus. The mode of nutrition is photosynthetic, parasitic or saprophytic. They reproduce both sexually and asexually. Asexual reproduction usually reproduction takes place by spore formation. Fertilization is not followed by embryo formation. The division Thallophyta includes two major classes, algae and lichens. 

Multiple choice biology classification of plants thallophyta cryptograms kingdom plantae

Eyespot or stigma is present in__________

  1. Spirogyra

  2. Ulothrix

  3. Nostoc

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

The eyespot or stigma is a photoreceptive organelle found in the flagellate of green algae like Chlamydomonas and some other unicellular photosynthetic organisms such as euglenoids. It allows the cells to sense light direction and intensity and respond to it by swimming either towards the light (positive phototaxis) or away from the light (negative phototaxis). A related response occurs when cells are briefly exposed to high light intensity, causing the cell to stop, briefly swim backward, then change swimming direction. Eyespot-mediated light perception helps the cells in finding an environment with optimal light conditions for photosynthesis. Eyespots are the simplest and most common "eyes" found in nature, composed of photoreceptors and areas of bright orange-red pigment granules. Signals relayed from the eyespot photoreceptors result in alteration of the beating pattern of the flagella, generating a phototactic response.

Multiple choice evs life inside water aquatic habitat animal and habitat wonderful world of bholu

Consider the following types of classification.
a. Bent ham and Hooker's system
b. Linnaeu's system
c. Conquest's system
d. Hutchinson's system
The correct sequence of the chronological order in which these classification systems appeared is?

  1. $1, 2, 3, 4$
  2. $2, 1, 4, 3$
  3. $1, 2, 4, 3$
  4. $2, 1, 3, 4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

A distinguishing feature of latex cells is that they are

  1. Single celled elements with anastomosing branches

  2. Single celled elements with nonanastomosing branches

  3. Multicelled elements with anastomosing branches

  4. Multicelled elements with nonanastomosing branches.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Latex cells (laticifers) are classified into two types: simple (non-articulated) laticifers, which are single-celled and non-anastomosing, and compound (articulated) laticifers, which are multi-celled and often anastomosing.

Multiple choice evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

Stomata do not occur in ________.

  1. Algae

  2. Liverworts

  3. Mosses

  4. Ferns.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
To allow the plant to retain water and exchange gases, small pores (holes) in the leaves called stomata also evolved. In algae, vascular tissue is not necessary as the entire body is in contact with the water, and the water and gases simply enters the algae through diffusion.
So, the correct answer is 'Algae'
Multiple choice evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

The most important character which is used in classifying different algae is

  1. Cell wall structure

  2. Habit

  3. Types of pigments

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The seven divisions of organisms that are considered within the algae are the Euglenophyta, Chrysophyta, Pyrrophyta, Chlorophyta, Rhodophyta, Paeophyta, and Xanthophyta. These divisions are separated on the basis of various features including their morphology and the biochemistry of their pigments, cell walls, and energy-storage compounds. The colors of these various algae types differ according to their particular mixtures of photosynthetic pigments, which typically include a combination of one or more chlorophylls and various accessory pigments.

Multiple choice evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

Plants which are mostly found on the sides of pond is

  1. Grass

  2. Algae

  3. Wheat

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Algae are unicellular or multicellular photosynthetic, eukaryotic organisms that can occur in salt or fresh waters, or on the surfaces of moist soil or rocks. Algae make their own energy or food from the sun but they also need water, correct temperature and nutrients to grow. Hence they usually live in water or damp environments. Algal growth is a natural occurrence in all water bodies and is the base of the aquatic food chain.

So the correct option is B.

Multiple choice evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

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

Ephedra is a well-known gymnosperm plant that produces ephedrine, an alkaloid commonly used as a stimulant and decongestant. Gymnosperms are seed-producing plants that lack flowers, placing Ephedraceae in this botanical classification rather than angiosperms or lower plants.

Multiple choice evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

Identify the non embryonic plant.

  1. Spirogyra

  2. Ulva

  3. Ulothrix

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Non-embryonic plants are included under the division Thallophyta. In non-embryonic plants, the zygote or the fertilized egg does not form the embryo. It directly forms a new plant. It mainly includes algae such as Spirogyra, Ulothrix, and Ulva. Hence, all the given options are correct.