intro
MCQs 1:
In which of the following is the notochord present only in free swimming larvae and absent in adults?
Topic: Presence of Notochord in different species
Correct Answer: B) Molgula
- Notochords are defining structures in the embryonic stage of chordates.
- The presence or absence of notochords in adults varies across species.
- In the list provided, only Molgula, an example of urochordates, exhibits a notochord in its free-swimming larval stage, which disappears as it matures into an adult.
- This differs from the other options; for instance, Amphioxus maintains its notochord into adulthood, while Earthworm and Sea Horse, not being chordates, never have a notochord.
- This leads us to the correct answer, B) "Molgula".
MCQs 2:
Which of the following is referred to as "craniate" due to the presence of a cranium?
Topic: Classification of Animals based on Structural Features
Correct Answer: D) Vertebrate
- The term "craniate" is used to denote organisms possessing a cranium, a hard bony structure that houses and protects the brain.
- Among the options provided, only vertebrates possess this distinct structure known as a cranium.
- Hence, the correct answer is D) "Vertebrate".
MCQs 3:
How many pairs of legs are present in insects?
Topic: Anatomical Characteristics of Insects
Correct Answer: B) 3 Pairs
- The number of leg pairs in an organism is a key determinant in categorizing them in the animal kingdom.
- Insects, falling under the class Insecta, are characterized by the presence of 3 pairs of legs.
- Thus, the correct answer is B) "3 Pairs".
MCQs 4:
What kind of thermoregulation do reptiles exhibit?
Topic: Thermoregulatory Mechanisms in Animals
Correct Answer: B) Poikilothermic
- Thermoregulation differs among organisms, with some maintaining constant internal body temperature (homeothermic) and others whose body temperature varies with the environment (poikilothermic).
- Reptiles, for instance, are poikilothermic or cold-blooded creatures whose body temperature fluctuates with environmental changes.
- Hence, the correct answer is B) "Poikilothermic".
MCQs 5:
Which creature is recognized as the largest invertebrate?
Topic: Size Classification among Invertebrates
Correct Answer: B) Giant Squid
- Invertebrates, which lack a backbone, comprise a diverse group of organisms with varying sizes.
- Among the options given, the Giant Squid, known for its sheer size and elusive nature, holds the record for being the largest invertebrate.
- As such, the correct answer is B) "Giant Squid".
MCQs 6:
In echinoderms, what kind of symmetry is exhibited by the adults and the larvae?
Topic: Symmetry in Echinoderms
Correct Answer: B) Adults are radially symmetrical, and larvae are bilaterally symmetrical.
- Echinoderms display a unique pattern of symmetry: adults are radially symmetrical while larvae are bilaterally symmetrical.
- This property sets them apart from many other species and is a crucial factor in their classification.
- Thus, the correct answer is B) "Adults are radially symmetrical, and larvae are bilaterally symmetrical".
MCQs 7:
In which of the following bird species are both ovaries and oviducts functional?
Topic: Avian Reproductive System
Correct Answer: A) Eagle
- In the avian world, most species have only a single functional ovary (typically the left), an adaptation believed to reduce weight for flight.
- However, Eagles are an exception to this rule, with both their ovaries being functional.
- Therefore, the correct answer is A) "Eagle".
Question 8:
What characteristic of cockroaches explains their lack of Red Blood Cells (RBCs) and hemoglobin?
Topic: Respiratory System in Arthropods
Correct Answer: C) Their blood does not transport oxygen and carbon dioxide
- Arthropods, such as cockroaches, have a unique respiration system that differentiates them from other organisms.
- Unlike many creatures, the blood of cockroaches does not carry oxygen and carbon dioxide, reducing the need for RBCs and hemoglobin.
- Hence, the correct answer is C) "Their blood does not transport oxygen and carbon dioxide".
Question 9:
Which organism group features a unique circulatory system known as the haemal system?
Topic: Circulatory System in Various Organism Groups
Correct Answer: B) Echinoderms
- Different organism groups possess varying circulatory systems, each adapted to their specific biological needs.
- The haemal system, a unique circulatory system, can be found in echinoderms.
- As a result, the correct answer is B) "Echinoderms".
Question 10:
In which group of organisms can you find dissolved hemoglobin in the plasma?
Topic: Hemoglobin Distribution in Various Organisms
Correct Answer: C) Earthworm
- Hemoglobin, a molecule that carries oxygen in the blood, is distributed differently across various organisms.
- In annelids, such as earthworms, hemoglobin is dissolved directly in the plasma.
- Thus, the correct answer is C) "Earthworm".
Question 11:
What is the primary function of Malpighian tubules in cockroaches?
Topic: Excretory Systems in Arthropods
Correct Answer: B) Excretion
- Different groups of organisms have different types of excretory systems adapted to their lifestyles and environments.
- In arthropods, such as cockroaches, the Malpighian tubules serve as the principal organs for excretion.
- Therefore, the correct answer is B) "Excretion".
Question 12:
What is the common name for the organism Ornithorhynchus?
Topic: Animal Taxonomy
Correct Answer: A) Duck-billed Platypus
- Identifying organisms based on their common names can be confusing due to regional variations.
- The scientific name Ornithorhynchus refers to a unique mammal commonly known as the Duck-billed Platypus.
- Consequently, the correct answer is A) "Duck-billed Platypus".
Question 13:
Which among the following organisms has five pairs of walking legs?
Topic: Animal Morphology
Correct Answer: C) Crab
- The number of legs can be a distinguishing feature among different animal groups.
- Crabs, being decapods, are characterized by having five pairs of walking legs.
- As a result, the correct answer is C) "Crab".
Question 14:
Which group is believed to be the progenitor of the Animalia kingdom?
Topic: Evolution of Kingdom Animalia
Correct Answer: B) Protists
- The evolutionary lineage of Kingdom Animalia is a subject of extensive research.
- Current theories propose that Kingdom Animalia originated from an organism within the Protists group, but the exact subtype of Protist is still debated.
- Therefore, the correct answer is B) "Protists".
MCQs 15:
Which statement about binomial nomenclature is inaccurate?
Topic: Binomial Nomenclature
Correct Answer: C) The specific epithet starts with a capital letter1
- Binomial nomenclature follows a set of specific rules for naming organisms.
- While the first letter of the genus is capitalized and both genus and species names are italicized, the species name or specific epithet does not start with a capital letter1.
MCQs 16:
The term "animalia" is derived from which Latin word?
Topic: Terminology in Taxonomy
Correct Answer: A) Anima1
- The scientific names of taxonomic groups, like "Animalia," often have origins in Latin or Ancient Greek.
- In the case of "Animalia," the term is derived from the Latin word "anima," which translates to soul or breath1.
MCQs 17:
Identify the incorrect match of a class to the phylum Annelida?
Topic: Classification of Annelida
Correct Answer: C) Bivalvia1
- Phylum Annelida is distinguished by its segmented body structure.
- It includes various classes like Polychaeta, Hirudinea, and Oligochaeta.
- Bivalvia, however, belongs to the phylum Mollusca, not Annelida1.
MCQs 18:
What are the organs responsible for excretion in crustaceans?
Topic: Excretory System in Crustaceans
Correct Answer: C) Coxal glands1
- Different taxonomic groups utilize different organs for the excretion process.
- In crustacean arthropods, excretion takes place through coxal glands1.
MCQs 19:
Which group of organisms primarily uses book lungs for respiration?
Topic: Respiratory Structures in Arthropods
Correct Answer: C) Arachnids1
- Different arthropods have developed various structures for respiration adapted to their specific habitats and lifestyles.
- Arachnids, a group of arthropods including spiders and scorpions, respire primarily through structures known as book lungs, hence the name1.
MCQs 20:
Which group of insects displays incomplete metamorphosis?
Topic: Insect Metamorphosis
Correct Answer: B) Hemimetabola1
- Metamorphosis in insects refers to the transformation process from juvenile to adult stages.
- Hemimetabola refers to incomplete metamorphosis, where the juvenile stages somewhat resemble the adults.
- Examples include cockroaches and wasps.
MCQs 21:
In which of the following does complete metamorphosis occur?
Topic: Insect Metamorphosis
Correct Answer: A) Moths and Mosquitoes1
- Complete metamorphosis in insects involves a pupal stage between the juvenile and adult stages.
- Moths and mosquitoes undergo complete metamorphosis, while grasshoppers and bed bugs do not.
Question 22:
In which organism can we observe spines in the skin?
Topic: Animal Body Structures
Correct Answer: D) Sea Star
- Different organisms have unique body structures that are adapted to their specific needs.
- When it comes to spines in the skin, echinoderms like sea stars possess this feature.
- Their skeleton is made of calcareous plates which form spines.
- Therefore, the correct answer is D) "Sea Star".
Question 23:
What is the fundamental unit of biological classification?
Topic: Basics of Biological Classification
Correct Answer: A) Species
- Biological classification is the process of classifying organisms in a hierarchical system.
- It starts with the broadest categories, such as kingdom and phylum, and narrows down to the most specific, which is the species.
- Species forms the basic unit of this classification because it includes the closest related organisms that can interbreed.
- Therefore, the correct answer is A) "Species".
Question 24:
Which class does the organism Lobster fall under?
Topic: Animal Classification
Correct Answer: C) Crustacea
- Animal classification is a systematic approach to categorize organisms based on their similarities and differences.
- Lobsters are classified under the class Crustacea, which is distinguished by organisms having a hard exoskeleton, two pairs of antennae, and a pair of compound eyes.
- Other members of this class include crabs, shrimps, and prawns.
- Consequently, the correct answer is C) "Crustacea".
Question 25:
Which Phylum includes organisms that exhibit bilateral symmetry in their larval stage and radial symmetry in their adult form?
Topic: Animal Symmetry
Correct Answer: B) Echinodermata
- Symmetry in biology refers to the balanced distribution of duplicate body parts.
- Echinodermata is a phylum that includes organisms like starfish and sea urchins.
- They are unique in exhibiting bilateral symmetry in their larval stage and radial symmetry in their mature stage, which is a characteristic adaptation to their bottom-dwelling marine lifestyle.
- Therefore, the correct answer is B) "Echinodermata".
Question 26:
Which one of the following is not included in the group Invertebrata?
Topic: Animal Classification
Correct Answer: A) Fishes
- The term "invertebrata" refers to animals that do not possess a backbone or spinal column.
- This group includes various phyla such as Porifera, Cnidarians, and even some subphyla of Chordates like Urochordata and Cephalochordata.
- Fishes, however, are classified as vertebrates, having a well-developed vertebral column.
- Hence, the correct answer is A) "Fishes".
Question 27:
The occurrence of Placoid scales is typical in which of the following?
Topic: Animal Morphology
Correct Answer: A) Cartilaginous Fishes
- Scales are hard, protective structures in the skin of most fishes.
- Placoid scales, also known as "dermal denticles," are small, numerous, and have a sandpaper-like texture, typically found in cartilaginous fishes.
- These are not present in bony fishes or cyclostomes.
- Consequently, the correct answer is A) "Cartilaginous Fishes".
Question 28:
Cotylosaurs are considered ancestors to which of the following?
Topic: Animal Evolution
Correct Answer: C) Reptiles
- Understanding the ancestry of living organisms helps trace the evolutionary history and transitions between major groups.
- Cotylosaurs, also known as "stem reptiles," are considered to be the progenitors of all modern reptiles.
- They are not believed to be direct ancestors of fish, amphibians, or mammals.
- Therefore, the correct answer is C) "Reptiles".