Question

Which of the following taxa shows zooidogamous oogamy?
I. Spirogyra
II. Funaria
III. Pteris
IV. Cycas
The correct answer is
(A). I, II, III
(B). I, III, IV
(C) I, II. IV
(D) II, III, IV

Answer 1

Hint: Oogamy is a type of anisogamy in which the gametes differ in size and shape. The huge female gamete, known as ovum, is static in oogamy, whereas the little male gamete, known as sperm, is mobile. Oogamy is a type of anisogamy that is considered excessive.

Complete answer:
Oogamy can be seen in most sexually reproducing organisms. Oogamy is seen in all higher species. Oogamy is a genetic trait found in all land plants. Oogamy, on the other hand, can be found in some aquatic plants, such as oomycetes. Algae such as red algae, brown algae, and green algae all have oogamy. Because just one gamete must travel through severe surroundings outside the plant, oogamy is preferred in plants.
Male gametes or antherozoids swim along a water path to female gametes in a kind of plant reproduction known as zooidogamy or archegonium. Algae, bryophytes, pteridophytes, and some gymnosperms all have zooidogamy others use siphonogamy. Zoidogamy is related to evolution because it provides a link between wind-borne abiotic pollination and comparable mechanisms and fluid-based mechanisms used in most abiotic pollination systems.
Zooidogamous oogamy is a type of sexual reproduction in which a biflagellate antherozoid combines with an archegonium egg to produce a zygote. For nourishment, this zygote is a sporophyte with a multicellular body that remains linked to the photosynthetic gametophyte.

Bryophytes, ferns, and some gymnosperms, such as Cycas and Ginkgo, have this property. As a result, option (D) is the proper response.

Note: Although it is widely assumed that anisogamy originated from isogamy, there is no evidence for this transition in the fossil record. As a result, biologists are turning to mathematical equations to better understand how anisogamy evolved.