Question

117. Which of the following have dioecious gametophytes?
(1) Punaria, Selaginella, Equisetum
(2) Rioci, Marchantia, Adiantum
(3) Marchantia, Dryopteris, Adiantum
(4) Marchantia, Cycas, Pinus -​

Answer 1

Answer:

3

Answer is 3

(3) Marchantia, Dryopteris, Adiantum

Answer 2

Marchantia, Dryopteris, and Adiantum are dioecious gametophytes.

Option 1 is incorrect because:

• Funaria is both monocious and autogenous because the antheridium is born on different heads of the same plant. Hence, it is both autoecious and monoecious.
• Equistum is also monocious.

Option 2 is incorrect because:

• Sexual reproduction takes place by means of well-developed sex organs therefore they are monoecious.
• The other two are dioecious.

Option 3 is correct because:

• Marchantia, Dryopteris and adiantum are all three dioecious.

Option 4 is incorrect because:

• Pinus is a monoecious plant, which bears both the male and female reproductive organs in the same plant.
• Marchantia and Cycas are dioecious.

Option 3 is correct.

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