Porifera (Class XI)
Questions covering sponge anatomy, cell types, classification, reproduction, and unique biological properties
Questions
What is the gelatinous matrix present within a sponge called?
- Pinacoderm
- Choanoderm
- Mesoglea
- Galectin
What are the cells which cover the inner surface of sponges called?
- Porocytes
- Pinocytes
- Choanocytes
- Lophocytes
Which of the following classes comprises of the largest number of porifera?
- Demospongiae
- Calcarea
- Hexactinelida
- Homoscleromorpha
Lissodendoryx is found in collaboration with
- shrimp
- sea grass
- starfish
- crabs
In sexual reproduction, eggs are formed by sponges by
- transformation of pinacocytes
- transformation of archeocytes
- choanocytes
- collencytes
Which of the following sentences is false?
- The Caribbean chicken-liver sponge Chondrilla nucula is responsible for bio-erosion.
- Sponge flies are specialist predators of freshwater sponges.
- Cyanobacterium causes rust-coloured bands in Aplysina red band syndrome.
- Glass sponges produce highly toxic chemicals for defence.
Which of the following sponges belong(s) to class Calcarea?
- Thenia
- Hylonema
- Olynthus
- Ceratoporella
What are grey cells of sponges equivalent to?
- Endocrine system
- Reproductive system
- Immune system
- Nervous system
Which compound secreted by sponges has anti-viral property?
- Mirabamide
- Plakordine A
- Aciculitin
- Plakevulin A
Which of the following cells of sponges exhibit totipotency?
- Collencytes
- Aracheocytes
- Oocytes
- Spongocytes
Which of the following organisms act as endosymbionts for freshwater sponges?
- Methane-eating bacteria
- Cyanobacteria
- Green algae
- Euglena
Which of the following sponges exhibit the phenomenon of carnivory?
- Spongia officinalis
- Callyspongia elegans
- Choridrocladia concrescens
- Clathrina clathrus
Which of the following are a prerequisite for regeneration of sponge fragment?
- Collencytes and choanocytes
- Archeocytes and choanocytes
- Collencytes and archeocytes
- Collencytes and sclerencytes
Which of the following animals exhibit the behaviour of sponging?
- Male bottlenose dolphins
- Female bottlenose dolphins
- Male sharks
- Female sharks
Match the following:
| Cell types | Function |
| 1. Lophocytes | a. Secrete spicules |
| 2. Rhabdiferous cells | b. Secrete polysaccharides |
| 3. Sclerocytes | c. Contraction |
| 4. Myocytes | d. Secrete collagen fibres |
- |||
|---|---|
|1. Lophocytes|c. Contraction|
|2. Rhabdiferous cells|a. Secrete spicules|
|3. Sclerocytes|d. Secrete collagen fibres|
|4. Myocytes|b. Secrete polysaccharides| - |||
|---|---|
|1. Lophocytes|b.Secrete polysaccharides|
|2. Rhabdiferous cells|a. Secrete collagen fibres|
|3. Sclerocytes|c. Contraction|
|4. Myocytes|d. Secrete collagen fibers| - |||
|---|---|
|1. Lophocytes|d. Secrete collagen fibres|
|2. Rhabdiferous cells|b. Secrete polysaccharides|
|3. Sclerocytes|a. Secrete spicules|
|4. Myocytes|c. Contraction| - |||
|---|---|
|1. Lophocytes|a. Secrete spicules|
|2. Rhabdiferous cells|d. Secrete collagen fibres|
|3. Sclerocytes|b. Secrete polysaccharides|
|4. Myocytes|c. Contraction|