Kingdom Plantae Features Practice Questions

Correct answer: Eukaryotic cells with chloroplasts

All plants are eukaryotic organisms containing chlorophyll-bearing organelles called chloroplasts. While some plants are partially heterotrophic (like insectivorous plants), the eukaryotic cellular structure and presence of chloroplasts remain defining features.

Correct answer: Alternation of generations

Kingdom Plantae is characterized by the alternation of generations, where the diploid sporophyte produces haploid spores via meiosis, and the haploid gametophyte produces gametes via mitosis. The lengths of these phases vary among different plant groups.

Correct answer: Cellulose

A distinguishing feature of Kingdom Plantae is a distinct cell wall primarily made of cellulose. This provides structural support and rigidity to the plant cells, unlike animal cells which lack a cell wall.

Correct answer: Bladderwort

Bladderwort and Venus flytrap are insectivorous plants that trap insects to supplement their nitrogen requirements. Although they contain chlorophyll and perform photosynthesis, their reliance on external organic sources makes them partially heterotrophic.

Correct answer: Parasitic

Cuscuta (Amarbel) is a total stem parasite that lacks chlorophyll and roots. It derives its nutrition and water directly from the host plant using specialized structures called haustoria.

Correct answer: Algae, Bryophytes, Pteridophytes, Gymnosperms, Angiosperms

Under Whittaker's system, Kingdom Plantae includes five major groups: Algae, Bryophytes, Pteridophytes, Gymnosperms, and Angiosperms. Fungi and Monerans (bacteria) were excluded from this kingdom because they have different cell wall compositions and body organizations.

Correct answer: Starch

Plants store their excess glucose in the form of starch, which is a polymer of glucose. Animals, in contrast, store glucose as glycogen in the liver and muscles.

Correct answer: Haploid gametophyte

In plants, the haploid gametophyte produces male and female gametes by the process of mitosis. This is distinct from animals, where gametes are typically produced by meiosis from diploid cells.

Correct answer: Diploid zygote

The fusion of two haploid gametes (syngamy) results in a diploid zygote. This zygote then develops into the diploid sporophyte, which represents the next phase of the alternation of generations.

Correct answer: Spores

In the plant life cycle, meiosis occurs in the sporophyte (specifically in spore mother cells) to produce haploid spores. These spores then germinate to give rise to the haploid gametophyte phase.

Correct answer: It is diploid and the dominant phase

In Pteridophytes, Gymnosperms, and Angiosperms, the diploid sporophyte is the dominant, independent, and photosynthetic phase of the life cycle. In Bryophytes, however, the gametophyte is the dominant phase.

Correct answer: Nitrogen

Insectivorous plants usually grow in nitrogen-deficient soils, such as bogs. They trap and digest insects to obtain the necessary nitrogenous compounds required for their growth and protein synthesis.

Correct answer: Presence of a cell wall

Earlier systems grouped all organisms with a cell wall into Kingdom Plantae. Modern biological classification, however, separates them based on cell wall composition (cellulose vs. chitin) and other phylogenetic characteristics.

Correct answer: Large central vacuoles

Mature plant cells typically contain a large central vacuole that maintains turgor pressure and stores nutrients. While animal cells may have small, temporary vacuoles, they do not have a large permanent central one.

Correct answer: Kingdom Plantae

Kingdom Plantae is defined by organisms that are eukaryotic, multicellular, and primarily autotrophic (photosynthetic). While some protists are photosynthetic, they are generally unicellular or colonial.

Correct answer: Diplontic

In Angiosperms (and Gymnosperms), the diploid sporophyte is the dominant and independent phase, while the gametophyte is highly reduced and dependent on the sporophyte. This pattern is referred to as a diplontic life cycle.

Correct answer: Bryophytes

In Bryophytes (like mosses and liverworts), the haploid gametophyte is the main, independent, and photosynthetic plant body. In higher plants like Gymnosperms and Angiosperms, the gametophyte is microscopic and dependent.

Correct answer: Green plants

Chlorophyll 'a' and 'b' are the characteristic photosynthetic pigments of green plants, including green algae, bryophytes, pteridophytes, gymnosperms, and angiosperms. These pigments capture light energy for photosynthesis.

Correct answer: Holozoic mode of nutrition

Holozoic nutrition (ingestion of solid food) is a characteristic of Kingdom Animalia. Plants are primarily autotrophic (produce their own food) or occasionally parasitic/insectivorous.

Correct answer: Gametophyte

Haploid spores are produced by the sporophyte through meiosis. When these spores germinate, they undergo mitotic divisions to form a multicellular haploid gametophyte.