NCERT Question 6 - Chapter 7 Class 9 - Diversity In Living Organisms

Explain how animals in Vertebrates are classified into further subgroups.

Answer:

Vertebrata is divided into two superclasses, viz. Pisces and Tetrapoda .

• Animals of Pisces have streamlined body with fins and tails to assist in swimming.  
• Animals of Tetrapoda have four limbs for locomotion.

Tetrapoda is further classified into following classes:

1. Amphibia: These animals are adapted to live in water and on land. They can breathe oxygen through skin when under water.
2. Reptilia: These are crawling animals. Skin is hard to withstand extreme temperatures.
3. Aves: Their forelimbs are modified into wings to assist in flying. Their beaks are present. Body is covered with feathers.
4. Mammalia: Mammary glands present to nurture young ones. Skin is covered with hair. Most of the animals are viviparous.