During unfavourable conditions, the sponges form

• cyst

• encyst

• spicule

• Gemmule

Eustachian canal connects

• middle ear with external ear

• middle ear with internal ear

• external ear with internal ear

• pharynx with middle ear

Which is common between earthworm, leech and centipede?

• They have Malphigian tubules

• They are hermaphrodite

• They have ventral nerve cord

• None of the above

Which of the following have notochord throughout life?

• Birds

• Fish

• Snake

• Amphioxus

First National Park developed in India is

• Gir

• Kaziranga

• Jim Corbett

• None of these

Shell of molluscs is derived from

• foot

• mantle

• ctenidia

• placoid

Tree of life is

• arbor vitae

• pons Varolii

• organ of Corti

• diencephalon

Which of the following is a respiratory disease?

• Polio

• Arthritis

• Asthma

• Cancer

Sciatic vein of frog opens in

• heart

• kidney

• pelvic region

• liver

Bacteria are considered plant because they

• are green in colour

• have rigid cell wall

• have chlorophyll

• have stomata