MCQ
Which of the following statement is correct?
- ADeoxygenated blood is poured into right atrium of heart.
- BThe excretory units of flat worms are flame cells.
- CHuman kidney has about 1 million nephridia.
- DBoth A and B.
Explanation:
Deoxygenated blood is pumped into right atrium by vena cavas or big veins.
Flame cells are excretory organs in Phylum Platyhelminthes.
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$a$. Large and more numerous nucleoli are present in cells actively carrying out protein synthesis.
$b$. Nuclear pores allow bidirectional movement of molecules.
$c$. Cytoskeleton is a glycolipid structure for mechanical support, motility and maintenance of the shape of the cell.
$d$. Steroidal hormones are synthesized by Golgi complex.
$‘A’ $ $ ‘B’$
$(1) $ Auxin $(I)$ Ripening and maturity of fruits
$(2)$Gibberellin $(II)$Differentiation of xylem elements
$(3) $ Cytokinin $(III)$ Prevention of genetic and physiological dwarfism
$(4) $ Ethylene $(IV)$ Found from tumour tissue of tobacco
$(1)$ $(2)$ $(3)$ $(4)$