Correct Answer: (a)
All listed are prominent endocrine glands in frogs.
Q2. Assertion: In unicellular organisms, all functions are performed by a single cell.
Reason: Multicellular animals exhibit division of labour.
Correct Answer: (b)
Both are true facts about cell organization, but one doesn't explain the other directly.
Q3. Assertion: Kidneys are the primary excretory organs in frogs.
Reason: Each kidney is composed of nephrons.
Correct Answer: (a)
Nephrons are the functional units that allow kidneys to perform excretion.
Q4. Which of the following statements about frog morphology are correct? (i) Head and trunk are present. (ii) Neck and tail are absent. (iii) A pair of nostrils is present above the mouth. (iv) Tympanum represents the ear.
Correct Answer: (c)
All these morphological features are explicitly mentioned in section 7.2.1.
Q5. Frogs are poikilotherms, which means they are:
Correct Answer: (b)
Animals whose body temperature varies with the environment are called cold-blooded or poikilotherms.
Correct Answer: (b)
Summer sleep is known as aestivation.
Q8. Assertion: The forebrain includes paired cerebral hemispheres.
Reason: Midbrain is characterized by a pair of optic lobes.
Correct Answer: (b)
Both are true anatomical facts about the brain, but they describe different regions.
Q9. Select the correct statement about the heart's sinus venosus: (i) It is triangular. (ii) It joins the right atrium. (iii) It receives oxygenated blood. (iv) It receives blood via vena cava.
Correct Answer: (a)
Sinus venosus receives deoxygenated blood from the body via vena cava.
Q11. Match the respiratory organs with the environment:
Column-I
Column-II
A. Water
(I) Lungs, Buccal cavity, Skin
B. Land
(II) Skin only
Correct Answer: (a)
In water only skin is used. On land, lungs, skin and buccal cavity are used.
Q12. Match the male reproductive parts:
Column-I
Column-II
A. Testes
(I) Adhered to kidney
B. Vasa efferentia
(II) 10-12 in number
C. Bidder’s canal
(III) Inside kidney
Correct Answer: (a)
Anatomical arrangement of the male reproductive system.
Q13. Match the excretory structures in frogs:
Column-I
Column-II
A. Uriniferous tubules
(I) Common exit for waste and gametes
B. Ureter (Male)
(II) Nephrons
C. Cloaca
(III) Urinogenital duct
Correct Answer: (a)
Functional anatomy of the excretory system.
Q14. Assertion: The length of the intestine is reduced in frogs.
Reason: Frogs are carnivores.
Correct Answer: (a)
Carnivores generally have shorter intestines compared to herbivores.
Q15. The organ in frogs that receives sound signals is the:
Correct Answer: (c)
A membranous tympanum (ear) receives sound signals.
Q16. Match the excretory product types:
Column-I
Column-II
A. Ureotelic
(I) Urea
B. Ammonotelic
(II) Ammonia (not mentioned for frog but standard)
Correct Answer: (a)
Classification based on nitrogenous waste.
Q17. Male frogs can be distinguished from females by the presence of:
Correct Answer: (b)
Male frogs have sound-producing vocal sacs and a copulatory pad on the first digit of the fore limbs.
Q18. Match the circulatory structures:
Column-I
Column-II
A. Arteries
(I) Carry blood from heart
B. Veins
(II) Collect blood to heart
Correct Answer: (a)
Basic function of blood vessels in the arterial and venous systems.
Q19. Statements about frog's ecological role: (i) They eat insects that damage crops. (ii) They maintain ecological balance. (iii) They are a link in the food web. (iv) Their legs are used as food in some countries.
Correct Answer: (a)
All these points are mentioned in the concluding section of the chapter.
Q20. In male frogs, testes are adhered to the kidneys by a double fold of peritoneum called:
Correct Answer: (b)
Testes are adhered to the upper part of kidneys by a double fold of peritoneum called mesorchium.
Q21. Match the following frog features:
Column-I
Column-II
A. Vocal sacs
(I) Only in males
B. Oviducts
(II) Open separately in cloaca
C. Eggs
(III) 2500-3000 at a time
Correct Answer: (a)
Reproductive biological data for frogs.
Q22. Assertion: The skin of the frog is smooth and slippery.
Reason: Mucous glands are present in the skin.
Correct Answer: (a)
Mucus secretion makes the skin smooth and slippery.
Q23. Assertion: Frog's blood is different from lymph.
Reason: Lymph lacks RBCs and few proteins.
Correct Answer: (a)
The absence of RBCs in lymph is a primary difference between the two fluids.
Q24. The body of a frog is divisible into:
Correct Answer: (b)
The body of a frog is divisible into head and trunk; neck and tail are absent.
Q25. Match the following for frog skin:
Column-I
Column-II
A. Dorsal side
(I) Pale yellow
B. Ventral side
(II) Olive green with spots
Correct Answer: (a)
Coloration patterns for camouflage.
Q26. How many basic types of tissues are found in all complex animals?
Correct Answer: (c)
According to the text, all complex animals consist of only four basic types of tissues.
Q27. Match the brain parts with their sub-divisions:
Column-I
Column-II
A. Forebrain
(I) Diencephalon
B. Midbrain
(II) Optic lobes
C. Hindbrain
(III) Medulla oblongata
Correct Answer: (a)
Structural organization of the frog's brain.
Q28. Match the frog's sleep patterns:
Column-I
Column-II
A. Summer sleep
(I) Hibernation
B. Winter sleep
(II) Aestivation
Correct Answer: (a)
Aestivation is summer sleep, Hibernation is winter sleep.
Q29. Which of the following are correct about the frog brain sub-divisions? (i) Forebrain includes olfactory lobes. (ii) Hind-brain includes cerebellum. (iii) Hind-brain includes medulla oblongata. (iv) Medulla passes out through foramen magnum.
Correct Answer: (a)
These are the anatomical components of the frog's brain.
Q30. Assertion: Skin acts as a respiratory organ in frogs on land.
Reason: Frogs exhibit cutaneous respiration in water only.
Correct Answer: (c)
Skin acts as a respiratory organ both on land and in water; hence the reason is false.
Q31. Regarding sexual dimorphism in frogs: (i) Males have vocal sacs. (ii) Males have copulatory pads. (iii) Copulatory pad is on the first digit of the forelimb. (iv) Females have vocal sacs.
Correct Answer: (a)
Vocal sacs are strictly a male characteristic used for calling mates.
Q32. Match the organs with their systems in frogs:
Correct Answer: (a)
Definitions provided in the summary of the chapter.
Q34. Assertion: Male frogs have vocal sacs.
Reason: Vocal sacs help in sound production during the breeding season.
Correct Answer: (a)
Vocal sacs are sound-producing structures found in males.
Q35. Assertion: Fertilisation in frogs is external.
Reason: It takes place in water.
Correct Answer: (a)
Fusion of gametes outside the body (in water) defines external fertilization.
Q36. Match the phylum and class of frog:
Column-I
Column-II
A. Phylum
(I) Chordata
B. Class
(II) Amphibia
Correct Answer: (a)
Taxonomic classification of frogs.
Q37. Which statement is true for the frog's digestive process? (i) Tongue is bilobed. (ii) Stomach secretes HCl. (iii) Chyme is partially digested food. (iv) Duodenum is the first part of the small intestine.
Correct Answer: (a)
These are the physiological steps of digestion in a frog.
Q38. Assertion: A frog's neck is absent.
Reason: It helps the frog to leap more effectively.
Correct Answer: (c)
The text confirms the neck is absent, but doesn't state leaping as the functional reason for its absence.
Correct Answer: (a)
Definitions of portal systems found in frogs.
Q41. In multicellular animals, a group of similar cells along with intercellular substances performing a specific function is called:
Correct Answer: (c)
The text defines tissue as a group of similar cells along with intercellular substances performing a specific function.
Q42. Assertion: Frogs take shelter in deep burrows during peak summer and winter.
Reason: Frogs are poikilotherms and cannot maintain a constant body temperature.
Correct Answer: (a)
Being cold-blooded, they must hibernate or aestivate to survive extreme temperatures.
Q43. Choose the correct statements about frog blood cells: (i) RBCs are nucleated. (ii) RBCs contain hemoglobin. (iii) WBCs are called leucocytes. (iv) Platelets are present.
Correct Answer: (a)
Standard features of frog hematology.
Q44. In frogs, the liver secretes bile which is stored in the:
Correct Answer: (b)
Liver secretes bile that is stored in the gall bladder.
Q45. The larval stage of a frog is called:
Correct Answer: (c)
Development involves a larval stage called tadpole.
Q46. Match frog's larval stage feature:
Column-I
Column-II
A. Tadpole
(I) Metamorphosis
B. Adult
(II) Frog
Correct Answer: (a)
Lifecycle stages of a frog.
Q47. Regarding frog sense organs, which are correct? (i) Eyes are simple eyes. (ii) External ear is absent. (iii) Sensory papillae are organs of taste. (iv) Tympanum is an organ of hearing.
Correct Answer: (a)
Statement (iii) is wrong; sensory papillae are for touch, while taste buds are for taste.
Q48. The heart of a frog has how many chambers?
Correct Answer: (b)
The heart has three chambers: two atria and one ventricle.
Q49. Which are correct about frog brain box? (i) Bony structure. (ii) Called cranium. (iii) Encloses the brain. (iv) Cranial nerves pass through it.
Correct Answer: (a)
Anatomical protection of the frog's central nervous system.
Q50. Match the blood components:
Column-I
Column-II
A. RBCs
(I) Leucocytes
B. WBCs
(II) Erythrocytes
C. Platelets
(III) Blood clotting
Correct Answer: (a)
Standard biological nomenclature for blood cells.
Q51. In frogs, the eyes are protected while in water by a:
Correct Answer: (b)
Eyes are bulged and covered by a nictitating membrane that protects them while in water.
Q52. Which statements about the frog's vascular system are correct? (i) It is a closed type. (ii) Heart has 3 chambers. (iii) RBCs are nucleated. (iv) Lymph lacks RBCs.
Correct Answer: (a)
All these are standard features of the frog's circulatory system as per the text.
Q53. Which statements about female reproductive system are true? (i) Ovaries are situated near kidneys. (ii) There is a functional connection between ovaries and kidneys. (iii) A female lays 2500-3000 eggs at a time. (iv) Fertilisation is external.
Correct Answer: (a)
Statement (ii) is wrong; there is no functional connection between ovaries and kidneys.
Q54. Which statements about frog development are correct? (i) Fertilisation is external. (ii) Development is indirect (has a larval stage). (iii) Tadpole is the larva. (iv) Metamorphosis occurs.
Correct Answer: (a)
Frogs have complex life cycles involving an aquatic larva.
Q55. Correct statements about frog sense organs: (i) External ear is absent. (ii) Nasal epithelium is for smell. (iii) Taste buds are for taste. (iv) Tympanum is for hearing.
Correct Answer: (a)
All sensory organ descriptions are accurate.
Q56. Assertion: The frog's brain is enclosed in a cranium.
Reason: Cranium is a bony structure known as the brain box.
Correct Answer: (a)
Cranium provides protection to the brain.
Q57. Which statements about male reproductive system are true? (i) Testes are yellowish ovoid bodies. (ii) Vasa efferentia are 10-12 in number. (iii) Sperms enter Bidder's canal. (iv) Ureters act as urinogenital ducts.
Correct Answer: (a)
All statements correctly describe the male reproductive anatomy as per the PDF.
Q58. Correct statements about the frog's hind limbs: (i) Larger than fore limbs. (ii) More muscular. (iii) End in five digits. (iv) Help in leaping and burrowing.
Correct Answer: (a)
Hind limbs are the primary organs for jumping/locomotion.
Q59. The study of the morphology of internal organs in animals is conventionally called:
Correct Answer: (b)
The word anatomy conventionally is used for the study of morphology of internal organs in animals.
Q60. Identify the correct statements about frog respiration: (i) In water, skin acts as the respiratory organ. (ii) On land, buccal cavity, skin and lungs act as respiratory organs. (iii) Respiration by lungs is called pulmonary respiration. (iv) During aestivation, gaseous exchange takes place through lungs.
Correct Answer: (a)
Statement (iv) is wrong; during aestivation/hibernation, exchange takes place through the skin.
Q61. Match heart coverings:
Column-I
Column-II
A. Heart
(I) Pericardium
B. Lungs
(II) Sac-like structure
Correct Answer: (a)
Membranous protection of vital organs.
Q62. The RBCs of frogs are:
Correct Answer: (b)
RBCs are nucleated and contain the red coloured pigment hemoglobin.
Q63. Select the correct statements about the frog's nervous system: (i) It has 10 pairs of cranial nerves. (ii) Brain is divided into fore-brain, mid-brain and hind-brain. (iii) Midbrain has a pair of optic lobes. (iv) Medulla oblongata continues into the spinal cord.
Correct Answer: (a)
These are all accurate descriptions of the frog's central and peripheral nervous systems.
Q64. Assertion: Sinus venosus is a triangular structure.
Reason: It receives blood from the arteries.
Correct Answer: (c)
Sinus venosus receives blood from the veins (vena cava), not arteries.
Q65. Assertion: Frogs have a hepatic portal system.
Reason: It is a special venous connection between the liver and intestine.
Correct Answer: (a)
The definition of the hepatic portal system is the venous link between the liver and intestine.
Q66. The ability of frogs to change colour to hide from enemies is called:
Correct Answer: (c)
The ability to change colour to hide from enemies is called camouflage.
Q67. Assertion: Frogs maintain ecological balance.
Reason: They serve as an important link in the food chain.
Correct Answer: (a)
Their role in the food chain is what ensures ecological stability.
Q68. Which of the following is true for the urinary bladder of a frog? (i) It is thin-walled. (ii) It is situated ventral to the rectum. (iii) It opens into the cloaca. (iv) It stores urea before excretion.
Correct Answer: (a)
Anatomical position and nature of the urinary bladder.
Q69. Digested food in frogs is absorbed by:
Correct Answer: (c)
Digested food is absorbed by the numerous finger-like folds in the inner wall of intestine called villi and microvilli.
Q70. Match the limbs with their digit counts:
Column-I
Column-II
A. Fore limbs
(I) 5 digits
B. Hind limbs
(II) 4 digits
Correct Answer: (a)
Anatomical count of digits in frog limbs.
Q71. Assertion: In male frogs, ureters act as urinogenital ducts.
Reason: Ureters carry both urine and sperms to the cloaca.
Correct Answer: (a)
Because they carry both gametes and waste, they are called urinogenital ducts.
Q72. Assertion: Epithelia have one free surface.
Reason: Epithelia line the body's surface and its cavities.
Correct Answer: (b)
Both are true characteristics of epithelial tissue, but the lining function doesn't explain the existence of a free surface.
Q73. Assertion: Frogs are beneficial for mankind.
Reason: They eat insects and protect crops.
Correct Answer: (a)
Their predatory nature on crop-eating insects makes them economically beneficial.
Q74. Assertion: All complex animals consist of only four basic types of tissues.
Reason: These tissues are organised in specific proportion and pattern to form an organ.
Correct Answer: (a)
The four basic tissues form organs to perform coordinated functions.
Q75. A triangular structure that joins the right atrium of the frog's heart is:
Correct Answer: (b)
A triangular structure called sinus venosus joins the right atrium.
Q76. Identify the correct statements regarding frog locomotion: (i) Hind limbs end in 5 digits. (ii) Fore limbs end in 4 digits. (iii) Hind limbs are larger and more muscular than fore limbs. (iv) Feet have webbed digits for swimming.
Correct Answer: (a)
All features support jumping on land and swimming in water.
Q77. Match digits count again:
Column-I
Column-II
A. Fore limb
(I) 4
B. Hind limb
(II) 5
Correct Answer: (a)
Anatomical digit count check.
Q78. Match the digestive parts with their functions:
Column-I
Column-II
A. Tongue
(I) Emulsifies fat
B. Gastric juice
(II) Captures food
C. Bile
(III) Digestion in stomach
D. Villi
(IV) Absorption
Correct Answer: (a)
Tongue captures food, Gastric juice digests in stomach, Bile emulsifies fat, Villi absorb.
Q79. Assertion: Frogs have nucleated RBCs.
Reason: Hemoglobin is absent in frog's blood.
Correct Answer: (c)
Frogs do have hemoglobin, which gives the red color to their blood.
Q80. The excretory system of a frog includes a pair of kidneys which are:
Correct Answer: (a)
Kidneys are compact, dark red and bean like structures.
Q81. Regarding the digestive system of a frog: (i) Alimentary canal is short. (ii) Food is captured by a bilobed tongue. (iii) Digestion of food takes place by HCl and gastric juices. (iv) Liver secretes pancreatic juice.
Correct Answer: (a)
Statement (iv) is wrong; the liver secretes bile, while the pancreas produces pancreatic juice.
Q82. Match the evolutionary trend terms:
Column-I
Column-II
A. Discernable trend
(I) Evolutionary trend
B. Tissues to Organ
(II) Increased complexity
Correct Answer: (a)
Biological concepts of organization complexity.
Q83. Vasa efferentia in male frogs open into:
Correct Answer: (c)
Vasa efferentia (10-12 in number) enter the kidneys and open into Bidder’s canal.
Q84. Assertion: Frogs do not drink water.
Reason: They absorb water through their skin.
Correct Answer: (a)
Their mode of water intake is exclusively through the skin.
Q85. A frog never drinks water but absorbs it through the:
Correct Answer: (b)
The frog never drinks water but absorbs it through the skin.
Q86. How many pairs of cranial nerves arise from the brain of a frog?
Correct Answer: (b)
There are ten pairs of cranial nerves arising from the brain.
Q87. Which statements regarding the excretory system are correct? (i) It consists of a pair of kidneys and ureters. (ii) Urinary bladder is thin-walled. (iii) Frog is an uricotelic animal. (iv) Excretory wastes are carried by blood into the kidneys.
Correct Answer: (a)
Statement (iii) is wrong; the frog is ureotelic (excretes urea), not uricotelic.
Q88. Assertion: External ear is absent in frogs.
Reason: Only tympanum can be seen externally.
Correct Answer: (a)
The tympanum serves as the external surface for receiving sound in the absence of an outer ear/pinna.
Q89. Assertion: Tadpoles undergo metamorphosis to become adults.
Reason: Metamorphosis involves a series of developmental changes.
Correct Answer: (b)
Both are true, but the definition of metamorphosis doesn't explain the fact that tadpoles undergo it.
Q90. Regarding the frog's portal system: (i) Hepatic portal system connects liver and intestine. (ii) Renal portal system connects kidney and lower body parts. (iii) These are venous connections. (iv) Arteries are part of the portal system.
Correct Answer: (a)
Portal systems are strictly venous links.
Q91. Assertion: Frogs have a three-chambered heart.
Reason: The heart of a frog is covered by a pericardium.
Correct Answer: (b)
Both are true, but the pericardium doesn't explain why it has three chambers.
Q92. Regarding the heart of a frog: (i) It has two atria and one ventricle. (ii) It is covered by pericardium. (iii) Sinus venosus receives blood from vena cava. (iv) Conus arteriosus is on the dorsal side.
Correct Answer: (a)
Statement (iv) is wrong; Conus arteriosus is on the ventral side.
Q93. Assertion: Final digestion in frogs takes place in the stomach.
Reason: Gastric juices contain digestive enzymes.
Correct Answer: (d)
Final digestion takes place in the intestine, not the stomach.
Q94. Respiration through the skin in frogs is called:
Correct Answer: (b)
In water, skin acts as an aquatic respiratory organ, which is cutaneous respiration.
Q95. The alimentary canal in frogs is short because they are:
Correct Answer: (c)
The alimentary canal is short because frogs are carnivores and hence the length of intestine is reduced.
Q96. Frog is a ureotelic animal because it excretes:
Correct Answer: (c)
The frog excretes urea and thus is a ureotelic animal.
Q97. The common species of frog found in India is:
Correct Answer: (b)
The most common species of frog found in India is Rana tigrina.
Q98. Match the numbers and terms for frogs:
Column-I
Column-II
A. Heart chambers
(I) 10 pairs
B. Cranial nerves
(II) 3
C. Vasa efferentia
(III) 10-12
Correct Answer: (a)
Quantitative facts about frog anatomy.
Q99. Correct statements about epithelial tissue (from summary): (i) Sheet like tissues. (ii) Line body surface and cavities. (iii) One free surface facing fluid or environment. (iv) Cells are connected at junctions.
Correct Answer: (a)
These are the defining characteristics of epithelia provided in the summary.
Q100. Which statement is correct regarding frog skin? (i) It is smooth and slippery. (ii) It is always maintained in a moist condition. (iii) It absorbs water. (iv) It contains mucous glands.
Correct Answer: (c)
The text states the skin is smooth, slippery due to mucus, moist, and absorbs water.
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