CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Biradial Symmetry And Lack Of Cnidoblasts Are The Characteristics Of


A

Ctenolana and Beroe

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B

Hydra and starfish

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

Ctenophora and Beroe

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D

Aurelia and Paramecium

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C

Ctenophora and Beroe


The correct options are A:

Explanation of correct option-

Phylum Ctenophora

  1. Biradial symmetry is a combination of radial and bilateral symmetry.
  2. Ctenophores are exclusively marine, radially symmetrical, diploblastic organisms.
  3. Cnidoblasts are the oval-shaped cells present on the tentacles and the body.
  4. Cnidoblasts are the characteristics of the phylum Cnidaria.
  5. Ctenophores show bioluminescence, the property of living organisms to emit light.
  6. Beroe is also known as melon jellyfish and belong to the phylum Ctenophora.
  7. Ctenolana is also an example of Phylum Ctenophora.
  8. Therefore they have biradial symmetry but lack cnidoblasts.

Explanation of incorrect option-

Option B- Hydra and starfish

  1. Hydra belongs to phylum Coelenterata.
  2. It bears Cnidoblasts which contains nematocysts containing poisonous fluid called hypnotoxin.
  3. They are aquatic, mostly marine, sessile or free-swimming radially symmetrical animals.
  4. Starfish belongs to the phylum Echinodermata.
  5. Echinodermata have an endoskeleton of calcareous ossicles and thus the name is Echinodermata.
  6. The adult echinoderms are radially symmetrical.
  7. It has water vascular system which helps in locomotion, capture and transport of food and respiration.
  8. Example- Asterias (starfish)

Option D- Aurelia and Paramecium

  1. Aurelia are coelenterates which bear cnidoblasts.
  2. Paramecium belongs to phylum Ciliophora.

Final answer: Biradial Symmetry And Lack Of Cnidoblasts Are The Characteristics Of Ctenolana and Beroe and Ctenophora.


flag
Suggest Corrections
thumbs-up
1
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Phylum Annelida
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon