Question 1

Which of the following animals belongs to the Phylum Porifera?

Accepted Answer

Sycon. Sycon is a member of Phylum Porifera, which are commonly known as sponges. These animals are characterized by the presence of numerous pores called ostia on their body. They are generally marine and possess a cellular level of organization.

Question 2

The presence of a 'Water Vascular System' is a unique feature of which phylum?

Accepted Answer

Echinodermata. Echinodermata is the phylum that possesses a water vascular system used for locomotion and respiration. Examples of this phylum include sea stars and sea urchins. They also exhibit pentamerous radial symmetry in their adult stage.

Question 3

Which class of animals is characterized by the presence of pneumatic (hollow) bones?

Accepted Answer

Aves. Aves, or birds, have hollow bones containing air cavities to reduce body weight for flight. This adaptation is crucial for their aerial lifestyle. Their forelimbs are also modified into wings to support flying.

Question 4

Animals that can maintain a constant body temperature regardless of the environment are called?

Accepted Answer

Homeotherms. Homeotherms, such as mammals and birds, are warm-blooded animals that regulate internal heat. This allows them to remain active in a wide variety of climates. In contrast, cold-blooded animals rely on external heat sources.

Question 5

Which of the following phyla is known for having a segmented body with jointed appendages?

Accepted Answer

Arthropoda. Arthropoda is characterized by a segmented body and the presence of jointed legs. It is the largest phylum in the animal kingdom, comprising over 80% of all known species. They also possess a tough exoskeleton made of chitin.

Animal Kingdom — Set 1