MCQ
Double circulatory heart is present in
- ABirds only
- BMammals only
- CReptilia only
- ✓Both $(a) $ and $(b)$
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($i$) The cells are composed of a single layer of tall and slender cells.
($ii$) Their nuclei are located at the base.
($iii$) Free surface may have microvilli.
($iv$) It is found in the lining of stomach and intestine
($v$) They help in secretion and absorption. Based on the above features identify the epithelium.
$R-$ In stroma, enzymatic reactions incorporate $CO_2$ into the plant leading to the synthesis of sugar.