Asexual reproduction in sponges takes place by
Binary fission
Gemmule formation
Multiple fission
Spore formation
Related Questions
The internal buds of freshwater sponges are otherwise called.
Choanocyte
Gemmule
Osculum
Blastula
Which of the following features is NOT associated with the phylum Porifera?
Meshwork of cells
Internal cavities lined with flagellated cells
Indirect development
Presence of a true coelom
Which of the following is not a Porifera
Sycon
Spirulina
Euspongia
Spongilla
Sponges primarily reproduce asexually by:
Binary fission
Budding and gemmule formation
Fragmentation only
Spore formation
Canal system in Porifera is not concerned with
Food collection
Respiration
Excretion
Locomotion
The skeletal framework of sponges is made up of:
Spicules and spongin fibers
Chitin
Calcium carbonate only
Silica only
Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?
Penguin is homeothermic, while the remaining three are poikilothermic
Leech is a fresh water form, while all others are marine
Spongilla has special collar cells called choanocytes, which are not found in the remaining three
All are bilaterally symmetrical animals
From the following statements select the wrong one.
Millipeds have two pairs of appendages in each segment of the body
Prawn has two pairs of antennae
Animals belonging to phylum-Porifera are exclusively marine
Nematocysts are characteristic of the phylum-Cnidaria
During unfavourable conditions, the sponges form
Cyst
Encyst
Spicle
Gemmule
Which of the following is NOT a characteristic feature of Porifera?
Presence of choanocytes
Presence of a true coelom
Body supported by spicules or spongin fibres
Mostly marine, asymmetrical body
