The lungs in frogs are

List-l	List-Il
(A) Cartilaginous Joint	(I) Do not allow any movement
(B) Pivot joint	(II) Between adjacent vertebrae in vertebral column
(C) Fibrous Joint	(III) Between carpal and metacarpal of thumb
(D) Saddle Joint	(IV) Between atlas and axis

Choose the correct answer from the options given below:

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Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to

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Match the following columns.

$\begin{array}{|p{0.6\linewidth}|p{0.3\linewidth}|} \hline Column\,\,I & Column\,\,II \\ \hline a.\,\,Cellular\,\,level\,\,of\,\,organisation & 1.\,\,Cnidarians \\ \hline b.\,\,Organ\,\,level\,\,of\,\,organisation & 2.\,\,Platyhelminthes \\ \hline c.\,\,Organ\,\,system\,\,level\,\,of\,\,organisation & 3.\,\,Chordates \\ \hline d.\,\,Tissue\,\,level\,\,organisation & 4.\,\,Porifera \\ \hline \end{array}$

$a\ \ b\ \ c\ \ d$

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Identify amphibians

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Mammals have the ability to produce a concentrated urine. Which statement not match with production of concentrated urine ?
(i) The Henle's loop and vasa recta play a significant role in this.
(ii) Concentration of urine occurs by counter current mechanism.
(iii) The proximity between the Henle's loop and vasa recta, as well as the counter current in them increases osmolarity from cortex to medulla.
(iv) Osmolarity increasing from 300 mOsmol L' in the cortex to about 1200 mOsmol L' in the inner medulla.
(v) Osmolarity gradient from cortex to medulla is mainly caused by NaCl and urea.
(vi) Presence of osmolarity gradient helps in an easy passage of water from the collecting tubule thereby concentrating the filtrate (urine).
(vii) Human kidneys can produce urine nearly four times concentrated than the initial filtrate formed.

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Identify the correctly matched pairs of the germ layers and their derivatives.

$I.$Ectoderm - Epidermis

$II$.Endoderm - Dermis

$III.$Mesoderm - Muscles

$IV.$Mesoderm - Notochord

$V.$Endoderm - Enamel of teeth