Page 1 - 2.Lesson Notes-Plantae-Gymnosperm,Angiosperm

SAI International School
Subject- Biology, Class-IX
Chapter- Diversity in living organisms
Sub Topic- Plantae: Gymnosperms, Angiosperms
Module-26
Lesson notes

Gymnosperms --

• Plants have naked seeds without fruits or flowers.
• The word ‘gymnos’ means naked and ‘sperma’ means seed.
• They are perennial, evergreen and woody plants.
• Examples: Pine, Cycas, Deodar, etc.

Eg :- Pine (Pinus), Cycas etc.

Pine cycas

Angiosperms ----

• The seeds are covered. The word ‘angios’ means covered.

• They are also known as flower-bearing or flowering plants.

• Plant embryos in seeds have structures called cotyledons.

Cotyledons: Cotyledons are called ‘seed leaves’ because in many
instances they emerge and become green when the seed germinates.

On the basis of the number of cotyledons present in the seed,
angiosperms are divided into two groups

(a) Monocotyledonous: Seeds have a single cotyledon. For examples:
wheat, rice, maize, etc.