1. Zooxanthilla
2. Zoochlorella
3. Volvox
4. Chlamydomonas.
Zoochlorella
1. Gastrodermal cells
2. Myoepithelial cells
3. Mesogloea
4. Interstitial cells
Gastrodermal cells
1. Both protoplasm and cell wall act as a single layer
2. Only protoplast acts as a single layer
3. Only cell membrane acts as a single layer
4. None of the above
Only protoplast acts as a single layer
1. Aboral end
2. Hypostome
3. Stalk
4. Body wall
Hypostome
1. Mesogloea
2. Muscle endothelial
3. Myoepithelial layer
4. Endoderm
Mesogloea
1. -2.3 bars
2. 0 bar
3. 22.4 bars
4. +2.3 bars
-2.3 bars
1. Interstitial cells
2. Gastrodermis
3. Muscle endothelial cells
4. Gland cells
Interstitial cells
1. Pure water and soil solution
2. Neither pure water nor soil solution
3. Pure water but higher than that of soil solution
4. Soil solution but higher than that of pure water
Pure water and soil solution
1. Protection
2. Defence from enemies
3. Sexual attraction
4. Attachment to the substrate of Hydra.
Attachment to the substrate of Hydra.
1. Building up of lost parts
2. Reunion of 2 halves
3. Wound healing
4. Death.
Building up of lost parts