Question

The criteria used for classification of plants

Answer 1

Answer: Classification of plants is done on the basis of:

(i) Differentiation

(ii) Presence or absence of vascular tissues

(iii) Production of seed

(iv) Covering of seed

(v) No. of cotyledons

Explanation:

Criteria used for the classification of plants:

(i) Thallophyta: Plant body without roots, leaves.

• Undifferentiated

• Mainly aquatic

• Commonly called algae.

Examples: Chara, Spirogyra, Ulothrix

(ii) Bryophyta: Differentiated into stem and leaf like structure;.

• Vascular tissues are absent

• Called amohibians of plant kingdom.

• Lives in marshy and need water for reproduction.

• Alternation of generation is seen.

Example: Riccia, Funaria, MArchantia

(iii) Petridophyta:

• Well differentiated

• Vascular tissues

• No seeds

Example: Fern, Marsilea

(iv) Gymnosperm

• Differentiated Vascular tissues

• Seeds are naked

• Generally Perennial, Evergreen

Example: Pine, Deodar, Cycas

(v) Angiosperm

• Differentiated, Vascular Tissue

• Seeds within the fruit.

• Commonly called flowering plants

• seeds contain cotyledons

• Divided into two parts: Monocots and Dicots.