Q1. Which of the following is not a characteristic of animals?
a) Presence of cell walls
b) Multicellular organization
c) Heterotrophic mode of nutrition
d) Most undergo sexual reproduction
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Correct Answer: a) Presence of cell walls
Explanation: Animals lack cell walls, a characteristic feature of plants, fungi, and some protists. This absence allows for greater flexibility and mobility in animal movement and structure.
Q2. Which of the following is not a phylum in the animal kingdom?
a) Mollusca
b) Chordata
c) Monera
d) Arthropoda
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Correct Answer: c) Monera
Explanation: Monera is a kingdom in the old classification system and does not belong to the animal kingdom. The other options represent phyla within the animal kingdom.
Q3. Animals classified under the phylum Arthropoda are characterized by:
a) Radial symmetry
b) Closed circulatory system
c) Exoskeleton made of chitin
d) Endoskeleton made of bone
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Correct Answer: c) Exoskeleton made of chitin
Explanation: Arthropods possess an exoskeleton made of chitin, providing protection and support. Radial symmetry is found in some other phyla, while closed circulatory systems and endoskeletons are characteristic of different animal groups.
Q4. Which of the following is a characteristic of mammals?
a) Ectothermy
b) Oviparous reproduction
c) Presence of mammary glands
d) Poikilothermy
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Correct Answer: c) Presence of mammary glands
Explanation: Mammals are characterized by mammary glands, which produce milk for nourishing their young. Ectothermy and oviparous reproduction are traits found in other animal groups.
Q5. In the classification of animals, vertebrates belong to which subphylum?
a) Cnidaria
b) Chordata
c) Arthropoda
d) Platyhelminthes
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Correct Answer: b) Chordata
Explanation: Vertebrates belong to the subphylum Chordata, characterized by the presence of a notochord, dorsal nerve cord, pharyngeal slits, and post-anal tail at some stage of their development.
Q6. An example of a cold-blooded animal is:
a) Dog
b) Snake
c) Owl
d) Rabbit
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Correct Answer: b) Snake
Explanation: Cold-blooded animals, or ectotherms, rely on external sources of heat to regulate their body temperature. Snakes are ectothermic, unlike mammals such as dogs, owls, or rabbits.
Q7. Which of the following is a characteristic feature of arachnids?
a) Six legs
b) Antennae
c) Two pairs of wings
d) Presence of cephalothorax and abdomen
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Correct Answer: d) Presence of cephalothorax and abdomen
Explanation: Arachnids, such as spiders and scorpions, have a body divided into two parts: the cephalothorax and the abdomen. They typically have eight legs, not six, and lack antennae and wings.
Q8. The respiratory system of insects primarily involves:
a) Lungs
b) Gills
c) Tracheae
d) Spiracles
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Correct Answer: c) Tracheae
Explanation: Insects have a respiratory system composed of tracheae, which are a network of tubes that deliver oxygen directly to the tissues. Spiracles are openings in the exoskeleton through which air enters and leaves the tracheal system.
Q9. An example of a bivalve mollusk is:
a) Octopus
b) Clam
c) Snail
d) Squid
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Correct Answer: b) Clam
Explanation: Bivalve mollusks, like clams, have a shell divided into two halves (valves) hinged together. Octopuses, snails, and squids belong to other classes within the phylum Mollusca.
Q10. The class Amphibia includes organisms that:
a) Lay eggs on land
b) Have scales covering their body
c) Undergo metamorphosis
d) Are exclusively marine
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Correct Answer: c) Undergo metamorphosis
Explanation: Amphibians undergo metamorphosis, transitioning from aquatic larvae to terrestrial adults. They lay eggs in water and lack scales, and while some species inhabit marine environments temporarily, they are not exclusively marine.