DEFINITIONS AND KEY POINTS FOR OBJECTIVES OF PLANT DIVERSITY

1     TERMS       11 DEFINITIONS                                            1′
Diversity The presence of variety of plants in the form of different taxas (specie, genera) is calleddiversi    of • lant.
Systematics The study of kinds and diversity of organismsand   the   evolutionary  relationships        among
them is called S stematics or taxonom .
Alternation of generation The     phenomenon    in    which      haploidgametophyte     generation    and      diploid
sporophyte generation alternates with each other is called alternation of Leneration.
Seed A seed consists of an embryo packed ovule along with store of food within a protective coverin:.
1k i [el g] 1 Wil 1 -3111tei 1 L’i 4.111 4:11101.F1

 

  1. Give scope and classification of plant kingdom.
  2. Describe kingdoms of life.
  3. Discuss domain classification system.
  4. Name major divisions of plants.
  5. Discuss basic concept of evolution of diversity of plants.

Short Questions

  1. What is diversity? Which factors do cause it?

Ans: The presence of variety of plants in the form of different taxas (specie, genera) is called diversity of plant. Different plants have different morphology, physiology, cytology and anatomy. It produces diversity among plants.

  1. What is systematic? What does it include?

Ans: The study of kinds and diversity of organisms and the evolutionary relationships among them is called systematics or taxonomy. The study of systematic gives the order and relationships among the organism.

  1. What are taxa? Give example.

Ans: The group of animal with similar characteristics forms a taxon. For example, Amaltas (cassia fistula) shows similarities with other cassia specie (cassia senna). Both have compound leaves and produce bean. Therefore, all such plants are placed in the same taxon. Moreover, Cassia also shares characters with Bauhinia verigata (Kachnar). So they are place in the same family.

  1. What is meant by Taxonomic hierarchy based on evolution?

Ans: Carolus Linnaeus did not accept evolution. But still many of his groupings show evolutionary relationships. Morphological similarities between two plants have a genetic basis. It gives rise common evolutionary history.


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  1. What is domain classification system? Why was it adopted?

Ans: The systematists have concluded on the basis of studies of ribosomal RNA that all life shares a common ancestor. They find that there are three major evolutionary lineages. Each of these lineages is called a domain. The domain is present above the kingdom.

  1. What is Archeae? Give its evolutionary significance. Ans: These are prokaryotic microbes. They live in extreme environment such as high temperature rift valleys on oceanfloor, or high-salt or acidic environments. All members of the Archaea inhabit anaerobic environments. These environments show the conditions on the earth at the time of origin. The Archaca are the most primitive life form.
    1. Name division of non-vascular plants.

    Ans: Division Bryopsida, Division Hepaticopsida. Division Anthoccropsida.

    r • ‘on of generation.

    kis

    Ans:      he phenorri non in which haploid gametoerhytnereration

    and diploid sporophyte generation alternates with each other is called alternation of generation.

    1. Define seed.

    Ans: A seed consists of an embryo packed ovule along with store of food within a o ective coverin:

    1==rt

    Multiple Choice Questions (MCQs)

    1. Modern classification of plants given by;

    (a) Darwin    (b) Carolus    (c) Heckle     (di Whittaker

    1. Five kingdom system was proposed by:

    (a) Darwin    (b) Carolus    (c) Heckle     (d) Whittaker

    1. Which of the followings is most primitive?

    (a) Eukarya   (b) Eubacteria (c) Archeae  (d) None

    1. Which of the followings is not nonvascular division?

    (a) Anthoceropsida            (b) Bryopsida (c) Gnetopsida

    1. Which of the followings is division of gymnosperms? (a) Anthophyta (b) Bryopsida (c) Gnetopsida (d) Pteropsida
    2. Which of the followings is division of vascular seedless

    Omits?                                                                         tad
    (a) Anthophyta (b) Bryopsida (c) Gnetopsida (d) Pteropsida

    1. Which of the followings are seed producing plants? (a) Anthophyta (b) Bryopsida (c) Gnetopsida (d) Pteropsida

    Answers: 1. (b)         2. (d) 3. (c) 4. (c) 5. (c) 6. (d)7. (a)

 

 

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