MCQ
Swim bladder or air bladder is present only in
- ✓Fish
- BAmphibia
- CAquatic reptilia
- DAquatic mammals
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Statements:
$A.$ On dry land it would die due to lack of O_2 if its mouth is forcibly kept closed for a few days.
$B.$ It has fourchambered heart.
$C.$ On dry land it turns uricotelic from ureotelic.
$D.$ Its lifehistory is carried out in pond water.
| $(a)$ Ophura | $(i)$ Mollusca |
| $(b)$ Physalia | $(ii)$ Platyhelminthes |
| $(c)$ Pinctada | $(iii)$ Echinodermata |
| $(d)$ Planaria | $(iv)$ Coelenterata |
Select the correct option
| Description | Structures |
| $(a)$ Tibia and fibula | Both form parts of knee joint |
| $(b)$ Cartilage and cornea | No blood supply but do require oxygen for respiratory need |
| $(c)$ Shoulder joint and elbow joint | Ball and socket type of joint |
| $(d)$ Premolars and molars | $ 20$ in all and $3$ rooted |