CBSE Class 9 Answered

DIVISION

CHARACTERISTICS

Division Thallophyta

• Plants have an irregularly shaped, undifferentiated body called thallus.
• Predominantly aquatic.

Division Bryophyta

• Plant body is either in the form of an undifferentiated thallus or in the form of leafy erect structures.
• No specialised tissue for the conduction of water and other substances from one part of the plant body to another.

Division Pteridophyta

• Plant body is differentiated into stem, leaves and roots.
• Have specialised tissue for the conduction of water and other substances from one part of the plant body to another.

Division Gymnospermae 

• Bear naked seeds.
• Usually perennial, evergreen and woody.

Division Angiospermae

• Plant body produces seeds which are enclosed within the fruits.
• Based on the number of cotyledons, angiosperms are divided into two classes—monocots and dicots.

Annelida

• The body is cylindrical and divided into ring-like segments.
• Have a true body cavity called coelom, present between the body wall and the digestive tube, which is filled with coelomic fluid.

Arthropoda

• Have jointed limbs, one pair each on some or on all body segments.
• Have an exoskeleton made of chitin but lack cilia.

Aves

• All birds belong to Class Aves.
• Warm-blooded or homeothermic animals.
• Heart is four-chambered.

Pisces

• Organisms belonging to Class Pisces are fish.
• They are cold-blooded or poikilothermic animals.