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NCERT Based MCQ with Explanation:
1. Which of the following best defines a tissue?
(a) A group of organs performing the same function
(b) A group of cells with intercellular substances performing one or more functions
(c) A group of cells performing unrelated functions
(d) A collection of organ systems
Explanation: A tissue is defined as a group of similar cells and intercellular substances working together for a common function.
2. What is the term for animals that have body temperature varying with the environment?
(a) Poikilotherms
(b) Homeotherms
(c) Endotherms
(d) Ectotherms
Explanation: Animals that do not regulate their internal temperature and rely on environmental temperatures are called poikilotherms (cold-blooded).
3. How do complex animals differ from unicellular organisms in terms of function?
(a) Complex animals have no specialized cells
(b) Unicellular organisms perform all functions in a single cell
(c) Complex animals perform functions with a single cell
(d) Unicellular organisms have organ systems
Explanation: In unicellular organisms, all life processes are carried out by one cell, while in multicellular animals, different cells perform specialized functions.
4. Which type of tissue forms the lining of body cavities?
(a) Muscular tissue
(b) Epithelial tissue
(c) Connective tissue
(d) Nervous tissue
Explanation: Epithelial tissues form the lining of body cavities and cover the surfaces of organs.
5. What is the function of connective tissue?
(a) Forming sheets lining body cavities
(b) Transmitting electrical signals
(c) Supporting and binding other tissues
(d) Facilitating movement of the body
Explanation: Connective tissue supports and binds other tissues and organs together.
6. Which of the following is not a type of connective tissue?
(a) Blood
(b) Bone
(c) Neuron
(d) Cartilage
Explanation: Neurons are part of the nervous system, not the connective tissue.
7. Which of the following tissues is responsible for movement?
(a) Connective tissue
(b) Epithelial tissue
(c) Muscular tissue
(d) Nervous tissue
Explanation: Muscular tissue is specialized for movement as it has the ability to contract.
8. What is the main function of nervous tissue?
(a) Movement
(b) Absorption
(c) Support
(d) Transmission of impulses
Explanation: Nervous tissue is responsible for transmitting electrical signals throughout the body.
9. Which of the following organs is made of all four types of tissues (epithelial, connective, muscular, and nervous)?
(a) Liver
(b) Heart
(c) Skin
(d) Bone
Explanation: The heart consists of epithelial, connective, muscular, and nervous tissues, which work together to pump blood.
10. What evolutionary trend is displayed by the increasing complexity in organ systems?
(a) Random variation
(b) Diminishing complexity
(c) Discernable evolutionary trend
(d) Lack of patterns
Explanation: The increasing complexity in organ systems represents an evolutionary trend toward greater specialization and efficiency.
11. Frogs belong to which class of animals?
(a) Reptilia
(b) Amphibia
(c) Mammalia
(d) Aves
Explanation: Frogs belong to class Amphibia, which includes animals that live both on land and in water.
12. What is the scientific name of the most common frog species found in India?
(a) Rana temporaria
(b) Rana hexadactyla
(c) Rana tigrina
(d) Bufo bufo
Explanation: *Rana tigrina* is the most common species of frog found in India.
13. Frogs exhibit which of the following types of temperature regulation?
(a) Homeothermic
(b) Poikilothermic
(c) Endothermic
(d) Exothermic
Explanation: Frogs are poikilothermic, meaning their body temperature varies with environmental temperature.
14. Which ability helps frogs to change color based on their environment?
(a) Mimicry
(b) Camouflage
(c) Counter-shading
(d) Iridescence
Explanation: Frogs use camouflage to blend into their surroundings and protect themselves from predators.
15. What is the term for the summer sleep of frogs to avoid extreme heat?
(a) Hibernation
(b) Dormancy
(c) Torpor
(d) Aestivation
Explanation: Frogs enter a state of aestivation during summer to avoid extreme heat.
16. What protects frog eyes when they are underwater?
(a) Nictitating membrane
(b) Tympanum
(c) Cornea
(d) Eyelids
Explanation: The nictitating membrane covers and protects the eyes of frogs when they are submerged in water.
17. What is the function of the tympanum in frogs?
(a) Hearing
(b) Vision
(c) Respiration
(d) Digestion
Explanation: The tympanum in frogs is the external ear that helps in receiving sound signals.
18. Which of the following structures helps frogs in swimming?
(a) Nostrils
(b) Webbed feet
(c) Tympanum
(d) Nictitating membrane
Explanation: Frogs have webbed feet, which assist in swimming by providing greater surface area for propulsion.
19. What distinguishes male frogs from female frogs?
(a) Presence of vocal sacs
(b) Lack of webbed feet
(c) Larger body size
(d) Absence of nictitating membrane
Explanation: Male frogs have vocal sacs, which help them produce mating calls, a characteristic absent in females.
20. Which part of the frog’s digestive system is responsible for bile storage?
(a) Liver
(b) Pancreas
(c) Gall bladder
(d) Cloaca
Explanation: The gall bladder stores bile produced by the liver, which aids in digestion of fats.
21. In frogs, what is the final part of the digestive system where waste is expelled?
(a) Cloaca
(b) Rectum
(c) Large intestine
(d) Urethra
22. Which method of respiration is used by frogs when they are on land?
(a) Cutaneous respiration
(b) Pulmonary respiration
(c) Buccal respiration
(d) Gaseous exchange
23. What is the primary function of the villi in the frog’s intestine?
(a) Secretion of digestive enzymes
(b) Absorption of digested food
(c) Propulsion of waste
(d) Production of mucus
24. Which system is responsible for the control and coordination of various body activities in frogs?
(a) Circulatory system
(b) Digestive system
(c) Nervous system
(d) Excretory system
25. Which part of the frog’s brain is involved in controlling balance and coordination?
(a) Cerebrum
(b) Cerebellum
(c) Medulla oblongata
(d) Optic lobes
26. Which of the following is a sensory organ in frogs that helps detect chemical stimuli?
(a) Tympanum
(b) Taste buds
(c) Nictitating membrane
(d) Sensory papillae
27. What type of fertilization occurs in frogs?
(a) Internal fertilization
(b) External fertilization
(c) Hermaphroditism
(d) Parthenogenesis
28. How do frogs reproduce?
(a) They reproduce through internal fertilization in a specialized organ
(b) They reproduce asexually
(c) They reproduce via external fertilization in water
(d) They reproduce by laying eggs on land
29. What is the name of the larval stage of frogs?
(a) Nymph
(b) Caterpillar
(c) Tadpole
(d) Larva
30. Which term describes the frog’s ability to breathe through its skin while in water?
(a) Pulmonary respiration
(b) Buccal respiration
(c) Cutaneous respiration
(d) Cellular respiration
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