Question

Match the following and choose the correct combination.

Column A	Column B
(A)Gracilaria	(i)Biflagellate zoospores
(B)Ectocarpus	(ii)Elaters
(c)Marchantia	(iii)Biflagellate antherozoids
(D)Cycas	(iv)Carpogonium(v)Multiciliated male gametes

(a)A-(i),B-(iv),C-(ii),D-(v)
(b)A-(iv),B-(i),C-(ii),D-(v)
(c)A-(iv),B-(ii),C-(iii),D-(i)
(d)A-(iv),B-(v),C-(ii),D-(i)

Answer 1

Hint: The female organ in the red algae is the Carpogonium. Biflagellate zoospores contribute to the asexual reproduction of brown algae. Elaters are found in a group of liverworts. There are multiciliated male gametes in a gymnosperm group.

Complete answer:
-Gracilaria is a red alga (Rhodophyta) genus. Carpogonium is the stationary female gametes in Gracilaria. It comprises the reproductive nucleus. A number of cells can be present, normally without chloroplasts.
-Ectocarpus is a genus of filamentous brown algae, and biflagellate zoospores reproduce asexually. The pear-shaped form with two unequal laterally attached flagella is Biflagellate zoospores. In brown algae, this assists in asexual reproduction.
-Marchantia, a group of liverworts, is a genus in the Marchantiaceae family of the order Marchantiales. The male gametes in Marchantia are called antherozoids and are structurally biflagellate. In response to changes in environmental moisture, an elater is a hygroscopic cell (or structure attached to a cell) that will therefore change shape.
-Cycads are a group of gymnosperms that have top-shaped multiciliated male gametes (the largest male gamete) and contain one embryo and two cotyledons (dicotyledonous) in each mature seed of these plants. Cycas is a dioecious plant with one plant comprising both the male and the female. The male gametes are ciliated and flagellated. Both pollen tube formation and the presence of male gametes take part in this.
So, the correct answer is, ‘A-(iv),B-(i),C-(ii),D-(v)’.

Note: -Gracilaria is notable for its economic value as an agarophyte and for its use as a foodstuff for humans, as well as for various shellfish species.
-Ectocarpus is a model organism for multicellularity genomics. Because of the relatively small size of its mature thallus and the pace at which it completes its life cycle, Ectocarpus was selected among the possible model organisms in the brown algae.
-Two levels of distinction are exhibited by the Marchantia: an upper photosynthetic layer with a well-defined porous upper epidermis and a lower storage layer.
-Cycas is a genus of plants belonging to the Cycadophyta, a very old lineage, not closely related to palms, ferns, trees, or any other group of modern plants.