Hydra is
| 1. | Fresh water, radial, and diploblastic |
| 2. | Fresh water, biradial, and triploblastic |
| 3. | Marine, radial, and diploblastic |
| 4. | Marine, radial, and triploblastic |
Which of the following is the phylum of the simplest animal to have a blood filled circulatory system?
1. Cnidaria
2. Nemertea
3. Annelida
4. Arthropoda
Most appropriate term for the life cycle of Obelia is
(1) Alternation of generations
(2) Metamorphosis
(3) Neoteny
(4) Metagenesis
Which of the following are the simplest animals to possess a complete digestive system?
(1) Nemertea
(2) Rotifera
(3) Ctenophora
(4) Annelida
In Hydra, egestion of undigested food and excretion of nitrogenous wastes occur through
(1) Mouth and tentacles
(2) Mouth and body wall
(3) Mouth
(4) Body wall
Identify the incorrectly matched pair.
| 1. | Planula-anatomical structure found in mollusks and used for feeding |
| 2. | Proglottids-One of the segments of a tapeworm, containing both male and female reproductive organs |
| 3. | Flame cells-protonephridia found in flatworms |
| 4. | Nematocyst-a sting found in animals of the jellyfish family |
Which of the following invertebrates have a duterostome development?
1. Arthropoda
2. Nematoda
3. Annelida
4. Echinodermata
Bilateral symmetry and lack of cnidoblasts are characteristics of
(1) Hydra and Starfish
(2) Star fish and Sea anemone
(3) Ctenoplana and Beroe
(4) Aurelia and Paramaecium
Taenia saginata differs from Taenia solium in
| 1. | Absence of scolex hooks |
| 2. | Absence of scolex hooks and uterine branching |
| 3. | Absence of scolex hooks and presence of both male and female reproductive organs |
| 4. | Presence of scolex hooks |
Cnidarins employ a cnidocyte for
(1) digesting food
(2) capturing food
(3) maintaining temperature
(4) osmoregulation
© 2026 GoodEd Technologies Pvt. Ltd.