Most primitive living vascular plants are

Arrange the following plants with their respective classes in the same order. Sphenopsida, Psilopsida, Pteropsida, Lycopsida, Gnetopsida

A) Selaginella
B) Equisitum
C) Sphagnum
D) Adiantum
E) Psilotum
F) Gnetum

The correct match is:

Assertion: In Bryophytes & Pteridophytes, the number of male gametes produced is several thousand times the number of female gametes produced.

Reason: A large number of male gametes fail to reach the female gametes during transport.

Pteriodophytes, especially ferns possess the following characteristics

i) Circinate vernation

ii) Ramenta

iii) Eustele

iv) Paraphysis

The correct combination is 

Assertion $\left(\mathrm{A}\right):$ In pteridophytes, the gametophytes require cool, damp, shady places to grow.

Reason $\left(\mathrm{R}\right):$ Specific requirement and the need for water for fertilization, the spread of living pteridophytes is limited and restricted to narrow geographical regions.

The correct answer is:

Assertion (A): In evolution, the distribution of Bryophytes and Pteridophytes, was limited.

Reason (R) : The need for water for the transportation of male gametes and fertilization limited their distribution.

The correct option among the following is:

Assertion (A): The development of zygote into young embryo with in female gametophyte indicates the precursor for the seed habit.

Reason (R) : In pteridophytes, the gametophyte requires cool, damp, shady place to grow.

The correct option among the following is:

Match the following lists:

The correct match is

Choose correct pair from the following
$\mathrm{I})$ Primary producers: Important step in evolution

$\mathrm{II})$ Specific water requirement for fertilization of Pteridophytes: Restricted to narrow geographical regions

$\mathrm{III})$ Growth of young embryo in female gametophyte: Food cycle of aquatic animals

$\mathrm{IV})$ Colonization of mosses and Lichens on rocks: Ecological significance