Q11. Which of the following is not a characteristic of birds?
a) Feathers
b) Endothermy
c) Oviparous reproduction
d) Four-chambered heart
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Correct Answer: c) Oviparous reproduction
Explanation: Birds reproduce by laying eggs (oviparous), making option c incorrect. The other options are characteristic features of birds: feathers, endothermy, and a four-chambered heart.
Q12. An example of an animal with radial symmetry is:
a) Jellyfish
b) Butterfly
c) Fish
d) Frog
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Correct Answer: a) Jellyfish
Explanation: Jellyfish exhibit radial symmetry, meaning their body parts are arranged around a central axis. Butterfly, fish, and frog have bilateral symmetry.
Q13. A group of organisms sharing the same evolutionary history and ancestry is called:
a) Species
b) Genus
c) Family
d) Clade
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Correct Answer: d) Clade
Explanation: A clade is a group of organisms that includes an ancestor and all of its descendants, sharing a common evolutionary history. Species, genus, and family are taxonomic ranks.
Q14. The class Reptilia includes organisms that:
a) Lay eggs on land
b) Have a three-chambered heart
c) Undergo metamorphosis
d) Possess mammary glands
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Correct Answer: a) Lay eggs on land
Explanation: Reptiles lay eggs on land, distinguishing them from amphibians (which lay eggs in water). They typically have a three-chambered heart and do not undergo metamorphosis like amphibians.
Q15. The phylum Echinodermata includes organisms characterized by:
a) Jointed appendages
b) Segmented bodies
c) Endoskeleton of calcium carbonate plates
d) Radial symmetry
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Correct Answer: c) Endoskeleton of calcium carbonate plates
Explanation: Echinoderms, such as starfish and sea urchins, have an endoskeleton composed of calcium carbonate plates. They exhibit radial symmetry, not jointed appendages or segmented bodies.
Q16. An example of an animal belonging to the class Insecta is:
a) Centipede
b) Beetle
c) Spider
d) Scorpion
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Correct Answer: b) Beetle
Explanation: Insects belong to the class Insecta and include organisms like beetles, butterflies, ants, and flies. Centipedes, spiders, and scorpions belong to other arthropod classes.
Q17. The respiratory pigment responsible for oxygen transport in vertebrates is:
a) Hemoglobin
b) Chlorophyll
c) Myoglobin
d) Hemocyanin
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Correct Answer: a) Hemoglobin
Explanation: Hemoglobin is the respiratory pigment in vertebrates, found in red blood cells, responsible for oxygen transport. Chlorophyll is found in plants, while myoglobin is present in muscles, and hemocyanin is found in some invertebrates.
Q18. An example of a mammal that lays eggs is:
a) Kangaroo
b) Platypus
c) Lion
d) Dolphin
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Correct Answer: b) Platypus
Explanation: The platypus, a monotreme mammal, lays eggs, distinguishing it from other mammals like kangaroos, lions, and dolphins which give birth to live young.
Q19. The phylum Porifera includes organisms commonly known as:
a) Flatworms
b) Roundworms
c) Sponges
d) Jellyfish
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Correct Answer: c) Sponges
Explanation: Porifera, or sponges, are simple multicellular organisms that lack tissues and organs. They are filter feeders, with porous bodies that allow water to flow through.
Q20. An example of an animal with a sessile lifestyle is:
a) Octopus
b) Snail
c) Barnacle
d) Crab
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Correct Answer: c) Barnacle
Explanation: Barnacles are sedentary marine crustaceans that attach themselves to hard substrates such as rocks or ship hulls. Octopuses, snails, and crabs are mobile organisms.