CBSE Class 11 Biology Structural Organisation In Animals Worksheet

Question. If the head of cockroach is removed, it may live for few days because
(a) the supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen
(b) the cockroach does not have nervous system
(c) the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body
(d) the head holds a 1/3rd of a nervous system while the rest is situated along the dorsal part of its body.
Answer. C

Question. Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth.
(a) Pharynx → Oesophagus → Ileum → Crop → Gizzard → Colon → Rectum
(b) Pharynx → Oesophagus → Crop → Gizzard → Ileum → Colon → Rectum
(c) Pharynx → Oesophagus → Gizzard → Crop → Ileum → Colon → Rectum
(d) Pharynx → Oesophagus → Gizzard → Ileum → Crop → Colon → Rectum 
Answer. B

Question. Which of the following features is used to identify a male cockroach from a female cockroach?
(a) Presence of a boat-shaped sternum on the 9th abdominal segment
(b) Presence of caudal styles
(c) Forewings with darker tegmina
(d) Presence of anal cerci 
Answer. B

Question. In male cockroaches, sperms are stored in which part of the reproductive system?
(a) Seminal vesicles
(b) Mushroom glands
(c) Testes
(d) Vas deferens
Answer. A

Question. Which of the following features is not present in Periplaneta americana?
(a) Exoskeleton composed of N-acetylglucosamine
(b) Metamerically segmented body
(c) Schizocoelom as body cavity
(d) Indeterminate and radial cleavage during embryonic development 
Answer. D

Question. The body cells in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of
(a) urea
(b) calcium carbonate
(c) ammonia
(d) potassium urate.
Answer. D

Question. The terga, sterna and pleura of cockroach body are joined by
(a) arthrodial membrane
(b) cartilage
(c) cementing glue
(d) muscular tissue.
Answer. A

Question. What external changes are visible after the last moult of a cockroach nymph?
(a) Both forewings and hindwings develop
(b) Labium develops
(c) Mandibles become harder
(d) Anal cerci develop 
Answer. A

Question. Select the correct option with respect to cockroaches.
(a) Malpighian tubules convert nitrogenous wastes into urea.
(b) Males bear short anal styles not present in females.
(c) Nervous system comprises of a dorsal nerve cord and ten pairs of ganglia.
(d) The forewings are tegmina which are used in flight. 
Answer. B

Question. Which one of the following is one of the paths followed by air or O2 during respiration in the adult male Periplaneta americana as it enters the animal body?
(a) Spiracle in metathorax, trachea, tracheoles, oxygen diffuses into cells
(b) Mouth, bronchial tube, trachea, oxygen enters cells
(c) Spiracles in prothorax, tracheoles, trachea, oxygen diffuses into cells
(d) Hypopharynx, mouth, pharynx, trachea, tissues
Answer. A

Question. Select the correct statement from the ones given below with respect to Periplaneta americana.
(a) Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives.
(b) Males bear a pair of short thread like anal styles.
(c) There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut.
(d) Grinding of food is carried out only by the mouth parts. 
Answer. B

Question. Which of the following happens in the common cockroach?
(a) Malpighian tubules are excretory organs projecting out from the colon.
(b) Oxygen is transported by haemoglobin in blood.
(c) Nitrogenous excretory product is urea.
(d) The food is ground by mandibles and gizzard.
Answer. D

Question. Assertion (A) : Periplaneta americana is nocturnal, omnivorous, household pest.
Reason (R) : It is because it acts as scavenger.
(a) A is true but R is false.
(b) A is false but R is true.
(c) Both A and R are true and R is correct explanation of A.
(d) Both A and R are true but R is not correct explanation of A. 
Answer. D

Question. Male and female cockroaches can be distinguished externally through
(a) anal styles in male
(b) anal cerci in female
(c) anal style and antennae in females
(d) both (b) and (c).
Answer. A

Question. Tissue is
(a) a group of similar cells together with their intercellular substances, which performa specific function
(b) a single specialised cell with specified functions
(c) composed of a single layer of cuboidal cells
(d) Both (a) and (c)
Answer. A

Question. In a tissue, the structure of cells varies according to their
(a) origin
(b) function
(c) gene content
(d) None of these
Answer. B

Question. The tissue which covers the external surface of the animal body and the internal surface of visceral organs is
(a) epithelial tissue
(b) connective tissue
(c) adipose tissue
(d) None of these
Answer. A

Question. Which one of the following options is associated with epithelium?
(a) Cells are compactly packed with little intercellular matrix
(b) Cells are loosely packed with large intercellular matrix
(c) It is highly vascularised
(d) It is a supporting tissue
Answer. A

Question. Epithelium cells are derived from
(a) ectoderm
(b) endoderm
(c) mesoderm
(d) All of the above
Answer. D

Question. Analyse the following statements.
I. It forms the lining of the cavities of alveoli of the lungs.
II. It occurs in the ducts of sweat glands.
III. It forms the lining of salivary glands and endocrine glands.
IV. It is a loose connective tissue.
Which of the above statements are true about the simple epithelial tissue?
(a) I and III
(b) II and III
(c) III and IV
(d) IV and I
Answer. A

Question. Which one of the following types of cells is involved in making of the inner walls of large blood vessels?
(a) Cuboidal epithelium
(b) Columnar epithelium
(c) Squamous epithelium
(d) Stratified epithelium
Answer. C

Question. A, B and C in given figures and choose the correct combination of option.

(a) A–Ciliated columnar, B–Squamous,C–Cuboidal
(b) A–Cuboidal, B–Squamous, C–Ciliated columnar
(c) A–Squamous, B–Ciliated columnar,C–Cuboidal
(d) A–Ciliated columnar, B–Cuboidal, C–Squamous
Answer. B

Question. Which statement is true about simple cuboidal epithelium?
(a) It is commonly found in ducts of glands
(b) Its main function is secretion and absorption
(c) It consists of a single layer of cube-like cells
(d) All of the above
Answer. D

Question. Which one of the following statements is/are not correct with reference to the columnar epithelium?
(a) It is composed of single layer of tall and slender cells
(b) Nucleus of the cell is located at its base
(c) Free surface may have microvilli
(d) It is commonly present in kidneys ofmammal
Answer. D

Question. The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans, these cells are mainly present in
(a) bile duct and bronchioles
(b) Fallopian tubes and pancreatic duct
(c) Eustachian tube and salivary duct
(d) bronchioles and Fallopian tubes
Answer. D

Question. Match the following columns.
Column I                             Column II
(Tissues)                            (Locations)
A. Squamous epithelium    1. Present in lungs
B. Cuboidal epithelium       2. Present in stomach
C. Columnar epithelium     3. Present in kidneys
Codes
     A B C 
(a) 1 3 2
(b) 2 3 1
(c) 1 2 3
(d) 3 2 1
Answer. A

Question. Some of the columnar or cuboidal cells gets specialised for secretion and are called glandular epithelium.
(a) True
(b) False
(c) Cannot say
(d) Partially true or false
Answer. A

Question. Identify the figures and choose the correct option.


Answer. C

Question. Categorisation of secretory glands can be done on the basis of
(a) mode of pouring of their secretion
(b) mode of breaking down of molecules
(c) mode of segregation of products
(d) None of the above
Answer. A


Question. Digestive enzymes and hormones are secreted by endocrine glands. Mucus and saliva are secreted by exocrine gland.
(a) True
(b) False
(c) Cannot say
(d) Partially true or false
A​​​​​nswer. D
 

Question. ldentify the incorrect pair.
(a) Pseudostratified epithelium – Forms epidermis of skin
(b) Non-keratinised stratified squamous – Provides protection
(c) Stratified cuboidal – Forms epidermis of fishes
(d) Transitional compound epithelium – Lines inner surface of urinary bladder
Answer. A

Question. Glands are formed of
(a) secretory epithelial cells
(b) transitional epithelial cells
(c) stratified epithelial cells
(d) pseudostratified epithelial cells
Answer. A

Question. Compound epithelium
(a) plays major role in secretion and absorption
(b) provides protection against chemical and mechanical stresses
(c) covers only dry surface of skin
(d) All of the above
Answer. B

Question. Cell junctions are formed by
(a) epithelial tissue
(b) connective tissue
(c) Both (a) and (b)
(d) muscular tissue
Answer. A

Question. Match the Column I (cell structures) with Column II (their characteristic features).
Column I                      Column II
A. Tight                   1. Cementn neighbouring cells
junctions                     together to form sheet
B. Adhering             2. Establish a barrier
junctions                     to prevent leakage
                                  of fluid across epithelial cells
C. Gap junctions      3. Cytoplasmic channels to
                                  facilitate communication
                                  between adjacent cells
Codes
     A B C
(a) 2 3 1
(b) 3 2 1
(c) 2 1 3
(d) 1 2 3
Answer. C

Question. The tissues that are most abundant, perform the function of linking and supporting other tissues of the body are
(a) epithelial tissue
(b) connective tissue
(c) muscular tissue
(d) nervous tissue
Answer. B

Question. Which one of the following is not a connective tissue? 
(a) Bone
(b) Cartilage
(c) Blood
(d) Muscles
Answer. D

Question. Find out the correct pair by choosing from options given below.
(a) White collagenous fibres – Long branched and inelastic
(b) Reticulin fibres – Long, unbrarched and elastic
(c) Yellow elastin fibres – Branched and flexible
(d) Both (a) and (c)
Answer. C

Question. Match the following columns.
Column I                 Column II
(Tissues)               (Compositions)
A. Areolar tissue     1. Fat cells
B. Adipose tissue    2. Osteocytes
C. Ligament           3. Loose connective tissue
D. Bone                 4. Dense regular connective tissue
Codes
     A B C D
(a) 3 1 4 2
(b) 1 2 3 4
(c) 4 3 2 1
(d) 2 1 4 3
Answer. A

Question. Macrophages, fibroblasts and mast cells are present in
(a) dense regular connective tissue
(b) dense irregular connective tissue
(c) areolar tissue
(d) adipose tissue
Answer. C

Question. Identify the figure with its correct function.

(a) Areolar connective tissue – Serves as a support framework for epithelium
(b) Adipose tissue – Stores fats, acts as heat insulators
(c) Dense regular tissue – Provides flexibility
(d) Dense irregular tissue – Provides strength and elasticity
Answer. B

Question. Identify the pair with its correct function.
(a) Adipose tissue – Formation of ligaments
(b) Areolar connective tissue – Migration of cells at the site of inflammation
(c) Whte fibrous connective tissue – Insulation
(d) Yellow fibrous connective tissue – Provides strength
Answer. B

Question. Tendons attach skeletal muscles to bones and ligaments attach one bone to another.
(a) True
(b) False
(c) Cannot say
(d) Partially true or false
Answer. A

Question. Cartilage is present
I. in the tip of nose and middle ear joints.
II. between adjacent bones of vertebral columns.
III. between adjacent bones of limbs and hands in adults.
(a) I, II and III
(b) I and II
(c) II and III
(d) I and III
Answer. C

Question. Matrix secreting cells of cartilage are known as
(a) chondrocytes
(b) osteoblasts
(c) fibroblasts
(d) mast cells
Answer. A

Question. Calcified cartilage is found in
(a) head of femur
(b) pectoral girdle
(c) ribs and sternum
(d) Both (a) and (b)
Answer. B

Question. Which of the followng statements are related to bones?
I. It is the main tissue that provides structural frame to the body.
II. It supports and protects softer tissues and organs.
III. The bone cells, osteocytes are present in the spaces called lacunae.
IV. They also interact with smooth muscles attached to them to bring about movements.
Codes
(a) I and II
(b) III and IV
(c) I and IV
(d) I, II and III
Answer. D

Question. End of long bones are covered with
(a) muscles
(b) cartilage
(c) adipose tissue
(d) bone marrow
Answer. B

Question. Bones of elderly people are brittle and have a risk of getting fracture more readily. This is because they contain more
(a) organic matter
(b) inorganic matter
(c) bone marrow
(d) Both (a) and (b)
Answer. B

Question. Choose the correct option for given components of blood.

(a) A–RBC, B–WBC, C–Platelets
(b) A–WBC, B–RBC, C–Platelets
(c) A–RBC, B–Platelets, C–WBC
(d) A–WBC, B–Platelets, C–RBC
Answer. C

Question. Match the following columns with the correct functions they perform.
Column I            Column II
A. RBC             1. Carry haemoglobin
B. Leucocytes   2. Prevent clotting
C. Platelets       3. Soldiers of the body
                       4. Maintain water balance
Codes
    A B C
(a) 1 3 2
(b) 1 4 3
(c) 2 3 4
(d) 1 2 3
Answer. A

Question. How marny types of leucocytes are found in a mammal?
(a) Five
(b) Two
(c) Four
(d) Three
Answer. B

Question. Each muscle is made up of long, cylindrical fibres arranged in parallel arrays. These fibres are composed of numerous fine fibrils called
(a) myofibrils
(b) microfilament
(c) fibroblast
(d) None of the above
Answer. A

Question. Based on their location, muscles are classified into
(a) three types –skeletal, smooth and cardiac muscles
(b) three types –skeletal, striated and cardiac muscles
(c) three types – voluntary, involuntary and cardiac muscles
(d) All of the above
Answer. A

Question. Smooth muscles are
(a) involuntary, fusiform, non-striated
(b) voluntary, multinucleate, cylindrical
(c) involuntary, cylindrical, striated
(d) voluntary, spindle-shaped, uninucleate
Answer. A

Question. In the cardiac muscles,
(a) cell junctions fuse the plasma membrane of adjacent cells
(b) contraction of one cell does not affect the other cells
(c) intercalated discs prevent the communication among cardiac cells
(d) All of the above
Answer. A

Question. The type of muscles present in our
(a) heart are involuntary and unstriated smooth muscles
(b) intestine are striated and involuntary
(c) thigh are striated and voluntary
(d) upper arm are smooth muscle fibres fusiform in shape
Answer. C

Question. Intercalated discs are characteristic of muscles found in
(a) heart
(b) thigh
(c) urinary bladder
(d) stomach
Answer. A

Question. Match the following columns.
Column I                         Column II
A. Striated muscle          1. Wall of blood vessels
B. Unstriated muscle       2. Nodal tissue
C. Striated involuntary    3. Biceps
muscle
Codes
     A B C 
(a) 3 1 2
(b) 1 2 3
(c) 2 3 1
(d) 2 1 3
Answer. A

Question. Which of the following tissue exerts the greatest control over the body’s responsiveness to charging condition?
(a) Epithelial tissue
(b) Connective tissue
(c) Muscular tissue
(d) Neural tissue
Answer. D

Question. Neuroglial cells make up more than
(a) one-third the volume of neural tissue in our body and form and protect the neurons
(b) one-half the volume of neural tissue in our body and form and support the neurons
(c) one-half the volume of neural tissue in our body and protect and support neurons
(d) one-third the volume of neural tissue in our body and protect and support neurons
Answer. C

Question. When a ……… is suitably stimulated,an electrical disturbance is generated which swiftly travels along its plasma membrane.
(a) neuron
(b) muscle fibre
(c) myofibril
(d) intercalated disc
Answer. A

Question. Recognise the figure and find out the correct matching.

(a) A–Axon, B–Cell body, C–Dendrite,D–Neuroglia
(b) A– Dendrite, B–Cell body, C–Axon,D–Neuroglia
(c) A–Axon, B–Neuroglia, C–Dendrite, D–Cell body
(d) A–Dendrite, B–Neuroglia, C–Axon, D–Cell body
Answer. A

Question. What is the function of neuroglial cells?
(a) Formation of neurons
(b) Destruction of neurons
(c) Protection of neurons
(d) Transmission of impulse along the neuron
Answer. C

Question. Apolar neurons are found in
(a) higher vertebrates
(b) humans
(c) Hydra
(d) sponges
Answer. C

Question. Which of the following parts of a neuron is surrounded by a fatty sheath?
(a) Axon
(b) Cyton
(c) Dendrite
(d) Node of Ranvier
Answer. A

Question. Which statement is not true regarding nerve fibres in mammals?
(a) All nerve fibres are non-medullated
(b) Sensory nerves transmit impulses to brain and spinal cord
(c) Efferent nerves carry signals of effector organs
(d) Mixed nerves carry signals in both directions
Answer. A

Assertion-Reasoning MCQs

Direction - Each of these questions contains two statements
Assertion (A) and Reason (R). Each of these questions also has four alternative choices, any one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true

Question. Assertion (A) Columnar epithelium is also known as glandular epithelium.
Reason (R) Cells of columnar epithelium form the lining of the stomach.
Answer. B

Question. Assertion (A) Compound epithelium plays major role in absorption, secretion and excretion.
Reason (R) It is not found in the stomach lining.
Answer. D

Question. Assertion (A) Cell junctions are present in the epithelium and other tissues.
Reason (R) Among cell junctions, adhering junctions help to stop substances from leaking across a tissue.
Answer. C

Question. Assertion (A) Adipose tissues are specialised to store fats.
Reason (R) The extra nutrients, which are not used immediately by the body get converted into fats.
Answer. A

Question. Assertion (A) Bone is the hardest tissue of the body.
Reason (R) Hardness of the bone is due to the calcification of its matrix.
Answer. A

Question. Assertion (A) The cells of connective tissue except blood secrete collagen fibres.
Reason (R) Fibres provide strength, elasticity and flexibility to the tissue.
Answer. A

Question. Assertion (A) Connective tissues are the most abundant and widely distributed in the body of complex animals.
Reason (R) They link and support other tissues or organs of the body.
Answer. A

Question. Assertion (A) Smooth muscles are known as involuntary muscles.
Reason (R) They are controlled by autonomic nervous system.
Answer. A

Question. Assertion (A) Cardiac muscle tissue is a contractile tissue present only in heart.
Reason (R) It provides rhythmic contraction to the heart.
Answer. A

Question. Assertion (A) Neuroglial cells protect and support the neurons.
Reason (R) They make up 90% neural tissue in our body.
Answer. C

Case Based MCQs

Identify the figure of a type of specialised connective tissue and answer the questions that follow

Question. Choose the correct option for the labels A and B in the above given specialised connective tissue.
(a) A–Collagen fibres, B–Chondrocyte
(b) A–Cartilage cell, B–Chondrocyte
(c) A—Chondrocyte, B–Collagen fibres
(d) A—Cartilage cell, B–Collagen fibres
Answer. A

Question. The connective tissue which lack fibres is
(a) areolar tissue
(b) adipose tissue
(c) blood
(d) ligament
Answer. C

Question. Strongest connective tissue with little or no ground substance is
(a) cartilage
(b) bone
(c) blood
(d) adipose tissue
Answer. B

Question. The most common cell found within connective tissue is
(a) histocytes
(b) leucocytes
(c) lymphocytes
(d) fibroblast
Answer. D

Question. In humans, the cartilage
(a) contains solid and pliable intercellular material
(b) in vertebrate embryo gets replaced by bones in adults
(c) is found in between the bones of vertebral column
(d) All of the above
Answer. D

Study the figure given below of cardiac muscle and answer the questions that follow

Question. Choose the correct option for the labelled part A in figure above.
(a) It represents junction between adjacent cells
(b) It represents intercalated disc
(c) It represents distinct and large myofibril
(d) Both (a) and (b)
Answer. D

Question. Cardiac muscles are different from skeletal muscles in a way as
(a) they are smooth
(b) they are non-striated
(c) they are voluntary
(d) they are striated and involuntary
Answer. D

Question. Cardiac muscles contract
(a) quickly and are fatigued
(b) slowly and are fatigued
(c) quickly and are not fatigued
(d) slowly and are not fatigued
Answer. C

Question. Cardiac muscle cells differ from striated muscle cells in having
(a) a centrally located nucleus
(b) different myofibrils
(c) fewer mitochondria
(d) no sarcoplasmic reticulum
Answer. A

Question.Cardiac muscles are
(a) elongated with tapering ends
(b) striped, skeletal muscles
(c) cylindrical, branched to form network
(d) large myofibrils and distinct
Answer. C

Direction Read the following and answer the questions that follow

Most epithelial tissue are essentially large sheets of cells covering all the surfaces of the body exposed to the outside world and lining the outside of organs.
Epithelium also forms much of the glandular tissue of the body. Skin is not the only area of the body exposed to the outside. Other areas include the air way, the digestive tract, as well as the urinary and reproductive systems, all of which are lined by an epithelium. Hollow organs and body cavities that do not connect to the exterior of the body, which includes blood vessels and serous membranes, are lined by endothelium (plural=endothelia), which is a type of epithelium. Also epithelium tissue cells are joined together by various cellular junctions.

Question. The cells of squamous epithelium are
(a) multilayered and thick
(b) flat and thick
(c) thin with rigid boundaries
(d) flat with irregular boundaries
Answer. D

Question. Which of the following is not a function of epithelium?
(a) Protection
(b) Connection
(c) Secretion or Excretion
(d) Absorption
Answer. B

Question. Lining of body cavities, ducts and tubes are made up of
(a) compound epithelium
(b) simple epithelium
(c) cuboidal epithelium
(d) keratinised epithelium
Answer. B

Question. In humans, compound squamous epithelium is found in
(a) stomach
(b) intestine
(c) trachea
(d) pharynx
Answer. D

Question.Assertion (A) Gap junctions perform cementing function to keep the neighbouring cells together.
Reason (R) Tight junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small and big molecules, etc.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) Both A and R are false
Answer. D 

Question. Select the correct route for the passage of sperms in male frogs.
(a) Testes → Vasa efferentia → Kidney → Seminal
vesicle → Urinogenital duct → Cloaca
(b) Testes → Vasa efferentia → Bidder’s canal →
Ureter → Cloaca
(c) Testes → Vasa efferentia → Kidney → Bidder’s
canal → Urinogenital duct → Cloaca
(d) Testes → Bidder’s canal → Kidney → Vasa
efferentia → Urinogenital duct → Cloaca
Answer: C

Question. Frog’s heart when taken out of the body continues to beat for sometime.
Select the best option from the following statements.
(1) Frog is a poikilotherm.
(2) Frog does not have any coronary circulation.
(3) Heart is “myogenic” in nature.
(4) Heart is autoexcitable.
(a) Only (4)           
(b) (1) and (2)
(c) (3) and (4)       
(d) Only (3) 
Answer: C

Question. Compared to those of humans, the erythrocytes in frog are
(a) without nucleus but with haemoglobin
(b) nucleated and with haemoglobin
(c) very much smaller and fewer
(d) nucleated and without haemoglobin. 
Answer: B

Question. Frogs differ from humans in possessing
(a) paired cerebral hemispheres
(b) hepatic portal system
(c) nucleated red blood cells
(d) thyroid as well as parathyroid. 
Answer: C

Question. Ureters act as urinogenital ducts in
(a) human males                         
(b) human females
(c) both male and female frogs     
(d) male frogs. 
Answer: D

Question. Which one of the following is the true description about an animal concerned?
(a) Rat - Left kidney is slightly higher in position than the right one
(b) Cockroach - 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen)
(c) Earthworm - The alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard and intestine
(d) Frog - Body divisible into three regions - head, neck and trunk 
Answer: B

Question. What happens if bone of frog is kept in dilute hydrochloric acid?
(a) Will become flexible     
(b) Will turn black
(c) Will break into pieces   
(d) Will shrink 
Answer: A

Question. The roof of the cranium of frog is formed by
(a) frontoparietal     
(b) orbitosphenoid
(c) parasphenoid     
(d) alisphenoid. 
Answer: A

Question. In frog, the surface of attachment of tongue is
(a) pterygoid         
(b) hyoid apparatus
(c) parasphenoid     
(d) palatine. 
Answer: B

Question. In frog, “fenestra ovalis” is
(a) the communication between the pharynx and the tympanic cavity
(b) the external opening of the tympanic cavity which is covered by the tympanic membrane
(c) the air filled cavity of the middle ear
(d) the opening in the auditory capsule which separates the middle ear from the internal ear.
Answer: C

Question. The kidney of an adult frog is
(a) metanephros     
(b) opisthonephros
(c) pronephros         
(d) mesonephros. 
Answer: D

Question. Mucus helps frog in forming
(a) thick skin       
(b) dry skin
(c) smooth skin   
(d) moist skin. 
Answer: D

Question. Bullfrog of India is
(a) Rana tigrina         
(b) R. sylvatica
(c) R. catesbeiana     
(d) R. esculenta. 
Answer: A

Question. Addition of a trace of thyroxine or iodine in water containing tadpoles will
(a) keep them in larval stage
(b) hasten their metamorphosis
(c) slow down their metamorphosis
(d) kill the tadpoles.
Answer: B