NCERT Solutions for Class 9 Science Chapter 7
Diversity in Living Organisms
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-97
Questions No-4
What are the major divisions in the Plantae? What is the basis for these divisions?
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The major divisions of Plantae and the basis for these divisions are as follows:
• Thallophyta: Simple body design; with no differentiation into root, stem and leaves.
• Bryophyta: Body is differentiated into stem and leaf-like structures. Vascular system is
absent.
• Pteridophyta: Body is differentiated into root, stem and leaves. Vascular system is present.
Reproductive organs are inconspicuous. Seeds are not produced.
• Gymnosperms: Seeds are naked.
• Angiosperms: Seeds are covered.
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Kingdom Plantae includes the following five divisions: 1. Thallophyta (Algae);2. Bryophyta;3. pteridophyta;
4. Gvmnospermae; 5. Angiospermae.
The first level of classification of plants is based on the presence and absence of well – differentiated distinct components in the body. Algae are separated from rest of the plants in having simple and less differentiated thalloid plant body. The next level of classification is based on the presence and absence of vascular tissues (i.e., xylem and phloem). This character separates the bryophyta from the rest of the plants. Further classification is based on the ability to bear seeds. Pteridophytes do not bear seeds. Finality, the groups are formed on the basis of seeds naked or enclosed within fruits. The gymnosperms have naked seeds whereas Angiosperms bear seeds enclosed within the fruits.