10th Grade Cnidaria Quizzes, Questions & Answers

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Practical Biology: Understanding Cnidarians and Their Systems

Practical Biology: Understanding Cnidarians And Their Systems

Explore key biological concepts in 'Bio 111 Lab 6'. This lab focuses on practical applications of biological theories, enhancing understanding through hands-on experiments. Ideal for students seeking to deepen their knowledge in...

Questions: 18 | Attempts: 10 | Last updated: Oct 13, 2025

Sample Question 1
What are some characteristics of Cnidarians?

Have a bilateral body symmetry

Live primarily on land

Have Cnidocytes (capture prey and defence)Usually MarineDimorphic - Have sessile polyp and motile medusa phaseEx: Jellyfish, coralsBody plan: 2 layers of cells around central cavity. Radial symmetryMouth=anus "never kiss a Cnidarian!"

Have exoskeletons for protection

Sample Question 2
Hydra: a)Movement? b)Feeding Behaviour? c)Cell types? d)Reproduction?

A) Swims using fins / b) Herbivorous: Photosynthesize through symbiotic algae / c) Bone cells, Skin cells, Muscle cells / d) Asexual: Laying eggs

1) Attach foot to substrate and extend tentaclesgliding, inching, somersaulting, floating on gas bubble from foot2) Carnivorous: Capture with tentacles and subdue with nematocystsPartial digestion in gastrovascular cavity, intracellular digestion in gastrodermal cells3) 1. Epitheliomuscular cells: epidermis=longitudinal gastrodermis=circular2.Cnidocytes: Have nematocysts triggered by cnidocils3. Neurons: Nerve net + sensory cells in epidermis4. Gland cells: Basal disc (to anchor to substrate) and Gastrodermis (secrete digestive enzymes5. Interstitial cells: Like stem cells (can divide and differentiate continuously)4) Sexual (internal): Some hermaphrodites. Union of games (from gonads - testes and ovaries)Asexual: Budding (mitosis)

A) Flies in the air for movement / b) Detritivorous: Feeds on dead organisms / c) Fat cells, Cartilage cells, Nerve cells / d) Asexual: Growing from seeds

A) Burrows underground for movement / b) Omnivorous: Eats plants and animals / c) Blood cells, Brain cells, Stomach cells / d) Sexual (external): Mating with other species

Sample Question 3
What are the components of histological sections of a Hydra?

Stomach, Liver, Lungs, Heart

Brain, Spinal Cord, Nerves, Bones

Roots, Stem, Leaves, Flowers

HyptostomeTentacle (with cnidocycsts)Gastrovascular cavityBody column (epidermis, mesoglea, gastrodermis)Basal DiscBud