Question 11:
Which of the following groups of animals are endothermic?
A) Fish
B) Reptiles
C) Amphibians
D) Birds
Answer: D) Birds
Explanation: Birds are endothermic (warm-blooded) animals, which means they can regulate their body temperature internally, unlike fish, reptiles, and amphibians, which are ectothermic.
Question 12:
The main respiratory structure in insects is:
A) Gills
B) Lungs
C) Tracheae
D) Skin
Answer: C) Tracheae
Explanation: Insects breathe through a network of small tubes called tracheae that transport oxygen directly to their tissues.
Question 13:
Which of the following is a characteristic of reptiles?
A) Moist skin
B) Lungs for breathing
C) External fertilization only
D) Scales
Answer: D) Scales
Explanation: Reptiles have dry skin covered with scales, which helps to minimize water loss in terrestrial environments.
Question 14:
Which class of animals undergoes metamorphosis?
A) Mammalia
B) Reptilia
C) Amphibia
D) Aves
Answer: C) Amphibia
Explanation: Amphibians typically undergo metamorphosis, transitioning from a larval stage (like tadpoles) to an adult form (like frogs).
Question 15:
What type of symmetry do adult echinoderms exhibit?
A) Bilateral symmetry
B) Radial symmetry
C) Asymmetry
D) Pentaradial symmetry
Answer: D) Pentaradial symmetry
Explanation: Adult echinoderms, such as sea stars, exhibit pentaradial symmetry, which means they can be divided into five equal parts.
Question 16:
Which of the following is an example of a cnidarian?
A) Earthworm
B) Jellyfish
C) Octopus
D) Sea cucumber
Answer: B) Jellyfish
Explanation: Jellyfish are cnidarians, which also include corals and sea anemones, and are characterized by their stinging cells called nematocysts.
Question 17:
Which of the following groups of animals are known for their ability to regenerate lost body parts?
A) Arthropods
B) Echinoderms
C) Mollusks
D) Mammals
Answer: B) Echinoderms
Explanation: Echinoderms, like starfish, have remarkable regenerative abilities, allowing them to regrow lost limbs or even entire sections of their bodies.
Question 18:
Which animal is known for having a three-chambered heart?
A) Fish
B) Amphibians
C) Birds
D) Mammals
Answer: B) Amphibians
Explanation: Amphibians typically have a three-chambered heart, which consists of two atria and one ventricle, allowing for some mixing of oxygenated and deoxygenated blood.
Question 19:
Which of the following is NOT a characteristic of the phylum Porifera?
A) Lack of true tissues
B) Presence of a body cavity
C) Filter feeding
D) Asymmetrical body plan
Answer: B) Presence of a body cavity
Explanation: Porifera (sponges) lack true tissues and a body cavity, which distinguishes them from more complex animal phyla.
Question 20:
Which of the following statements about mammals is TRUE?
A) All mammals lay eggs.
B) Mammals have hair or fur at some stage in their life.
C) Mammals are exclusively aquatic.
D) Mammals breathe through gills.
Answer: B) Mammals have hair or fur at some stage in their life.
Explanation: All mammals possess hair or fur at some point in their life cycle, which is a key characteristic of the class Mammalia.
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