WorksheetsPhylum Cnidaria
Total questions: 23
Worksheet time: 6hrs 45mins
What type of symmetry is mostly found in the phylum Cnidaria?
Bilateral
Asymmetrical
Radial
Spherical
Which of the following is not a characteristic of the hydrostatic skeleton found in Cnidarians?
It allows for complex movements.
It supports the body.
It is used by medusoid forms like jellyfish.
It involves propulsion by contracting and releasing the body.
This body form is considered:
polyp; motile
polyp; sessile
medusa; motile
medusa; sessile
Which of the following is not an example of organisms in the phylum Cnidaria?
Sea anemone
Coral
Hydra
Starfish
What is the primary body form of a jellyfish?
Medusa
Polyp
Mesoglea
Basal disk
Which structure allows the Hydra to attach to a substrate?
Tentacles
Basal disk
Gastrovascular cavity
Epidermis
How do Hydras move from one spot to another?
By swimming freely in the water
By contracting and expanding their body
By gliding slowly on their base
By using their tentacles to crawl
What is the function of the "nerve net" in Hydras?
To absorb nutrients
To reproduce
To coordinate body movements
To capture prey
What is the primary function of nematocysts in the tentacles of certain organisms?
To aid in movement
To capture and sting prey
To perform photosynthesis
To filter water
What is unique about the digestive system of the organisms in Cnidaria?
It has multiple openings for digestion.
It uses external digestion.
It has a single opening serving as both mouth and anus.
It lacks a digestive system.
How do the barbs in the nematocysts function?
They release toxins into the air.
They act like suction cups.
They work like harpoons.
They absorb nutrients.
What mechanism do jellyfish use to capture their prey?
Electric shocks
Speed and agility
Stinging cnidocyte-filled tentacles
Camouflage
What is a form of asexual reproduction in Cnidaria?
Binary fission
Budding
Spore formation
Fragmentation
How do jellyfish typically reproduce sexually?
Internal fertilization
Budding
Broadcast spawning
Binary fission
What is the initial form of a polyp in the life cycle of a jellyfish?
Medusa
Larvae
Zygote
Polyp
What is the primary method of respiration in jellyfish?
Through lungs
Absorbing O₂ from water directly through their skin
Through gills
Photosynthesis
Which of the following is a feature unique to cnidarians like jellyfish?
Presence of a brain
Nematocysts on their tentacles
Ability to swim
Having a skeletal system
How do jellyfish achieve excretion?
Through kidneys
Using a specialized excretory organ
Through diffusion
Through active transport
What is the significance of the "nerve-like" cells in jellyfish?
They form a complex brain
They help in reproduction
They conduct electrical messages and respond to stimuli
They are used for digestion
What is the function of the toxins in a cnidocyte as described in the image?
To help the organism swim faster
To disable prey
To attract mates
To provide camouflage
Which unique example of an organism with cnidocytes is mentioned in the image?
Jellyfish
Sea anemone
Portuguese Man o' War
Coral
What is the correct sequence of biological organization from the simplest to the most complex level?
Atom, Molecule, Macromolecule, Cell, Tissue, Organ, Organ System, Organism, Population, Community, Ecosystem, Biosphere
Atom, Cell, Tissue, Organ, Organ System, Organism, Population, Community, Ecosystem, Biosphere
Molecule, Atom, Cell, Tissue, Organ, Organ System, Organism, Population, Community, Ecosystem, Biosphere
Atom, Molecule, Cell, Macromolecule, Tissue, Organ, Organ System, Organism, Population, Community, Ecosystem, Biosphere
Which level of biological organization is primarily involved in the coordination of activities such as digestion or nerve responses?
Organ
Tissue
Cell
Organ System
