Questions
The gonads of hydra grow from
- epitheliomuscular cells
- nerve cells
- gland cells
- interstitial cells
How are polyps and medusae forms of cnidarians similar?
- Both can be motile.
- Both have mature gonads.
- Both have poorly developed muscular system.
- Both are diploblastic.
Which of the following phylums forms coral reefs?
- Mollusca
- Cnidaria
- Annelida
- Echinodermata
What kind of symmetry and how many body layers are possessed by cnidarians?
- Radial or biradial symmetry, and diploblastic
- Radial symmetry and triploblastic
- Bilateral symmetry and diploblastic
- Bilateral symmetry and triploblastic
Which type of larva is found in cnidarians?
- Planula
- Oncosphere
- Rhabditiform
- Cysticercus
Which of the following has nerve cells but no brain?
- Cockroach
- Protozoans
- Sponge
- Hydra
True alternation of generations is shown by cnidarians. It is known as
- metagenesis
- metamorphosis
- metachrosis
- metaboly
Cnidarians are considered as more advanced than poriferans because of
- the presence of true germ layers
- muscle cells
- the presence of nematocysts
- an indefinite symmetry
Which of the following does not belong to phylum cnidaria?
- Sea pen
- Sea flower
- Sea cucumber
- Sea fur
The stored food in hydra is
- oil globule
- starch
- glycogen
- cellulose
Which of the following is correctly matched?
- Portuguese man-of-war - Adamsia
- Red coral - Gorgonia
- Sea anemone - Aurelia
- Sea fan - Gorgonia
Which of the following is a specialised characteristic of only cnidarians?
- Presence of nmateocysts
- Polymorphism
- Hermaphroditism
- Flame cells
Nematocysts of hydra are derived from
- digestive cells
- interstitial cells
- musculo-epithelial cells
- mesoglea
The alga that is found in the body of a hydra is a
- symbiont
- parasite
- hydrophyte
- epiphyte
Corals can be best described as
- the most poor fauna
- the most rich fauna
- fresh water fauna
- free living ctenophorans