D.

Marchantia

In Marchantia, a bryophyte, the archegonia (female sex organs) are borne on special branches called archegoniophore or female receptacles. Each archegoniophore has rows of archegonia protected by involucre or perichaetium.

A.

Marchantia, a liverwort, is dioecious. The female thallus bears female sex organs called archegonia on special branches called archegoniophores. The plant's body is anchored by unicellular rhizoids.

D.

Two

The types of gametes produced by a plant depend upon the number of hetrozygous pair.
Number of types of gametes  = Zⁿ
   n = number of heterozygous pair
                 2¹ = 2
The gametes are  - ABC and AbC.

B.

in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cow

In cloning of cattle a fertilized egg divides in 2, then in 4 and then in 8. This embryo is carefully removed from the womb. The embryonic cells are then separated using enzyme. Each isolated cell is kept in a nutrient medium and later implanted in the womb of a different 'host mother' cow.

A.

rhizome

In ginger, vegetative propagation occurs through rhizome. Rhizomes are stems which grow horizontally under the ground. In ginger, the underground stems are swollen with food reserves. The terminal bud grows upward to produce the flowering shoot and the lateral buds grow out to form new plant.