MCQ
Which of the given is/are examples of differentiation?
- ALoss of nucleus and perforations in some sieve tube members
- BLignin deposition in tracheids and vessels
- CDifferential wall thickening in guard cells
- ✓More than one option is correct
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$(a)$ In equisetum the female gametophyte is retained on the parent sporophyte.
$(b)$ In Ginkgo male gametophyte is not independent.
$(c)$ The sporophyte in Riccia is more developed than that in Polytrichum.
$(d)$ Sexual reproduction in Volvox is isogamous.
$(e)$ The spores of slime molds lack cell walls.
How many of the above statement are correct?
$II.$ Tracheids/vessels elements are larger during periods when water is abundant
$III.$ Tracheids/vessels elements have thicker wall during periods of water deprivation
$IV.$ Wood formed in the previous years is darker than newer wood
Select the combination of correct statements from the options given below
$A.$ Cyanophyceae $a.$ Green colour
$B.$ Chlorophyceae $b.$ Blue green colour
$C.$ Phaeophyceae $c.$ Red colour
$D.$ Rhodophyceae $d.$ Brown colour