Biology Mcqs

Which of the following are motile zooids in cnidarians?

A. Polyps
B. Medusae
C. Both of these
D. None of these

In sponges fertilization takes place in____________?

A. Ectoderm
B. Mesenchyme
C. Endoderm
D. Uterus

80% of the food of sponges consists of__________?

A. Detrital organic particles
B. Zooplankton and small animals
C. Phytoplanktons
D. all of these

The single main opening of the sponge cavity is____________?

A. Osculum
B. Ostia
C. Spongocoel
D. None of these

Sperms released in water are carried to the mesenchyme in sponges by__________?

A. Amoeboid cell
B. Stipules
C. Spicules
D. Ses

The skeleton of sponges is made up of___________?

A. Calcium
B. Silica
C. Both of these
D. None of these

The sponges in which sperms develop first are included in the category of__________?

A. Peritandrous
B. Pertandrous
C. Protendrous
D. Protandrous

A sponge of Antarctica which is more than a meter tall is____________?

A. Scolymastra joubini
B. Euplectella
C. Spongilla
D. Leucoselenia

The function of coelom is__________?

A. To increase the size of the animals
B. To help in the functioning of reproductive system
C. To provide space for the development of organs and systems
D. None of these

In most triploblasts after embryonic development the three layers are represented as___________?

A. Separate layers of cells
B. Structures formed from them
C. Structures associated with them
D. Their functions in body