Question

Pouched mammals are known as:
A. Prototherians
B. Metatherians
C. Eutherians
D. Therians

Answer 1

Hint:-Since their female has a pouch or marsupium that holds the teats, where the young ones are fed and taken care of, they are called pouched mammals. An example of the same is Kangaroo.

Complete step-by-step solution:-
Pouched mammals are known as Metatherians, which are also known as marsupials, in a variety of major and evident ways, they vary from placental mammals. The palate of marsupials is typically "fenestrated," that is to say, its bony surface includes large gaps or spaces. The dental angular process is medially inflected (bent) in almost all marsupials. The brain is narrow and thin. Compared to that of similar-sized placental mammals, it houses a comparatively small and basic brain.

Fig: An example of a pouched mammal, Kangaroo.
The correct answer is, therefore, option B.

Additional information:
As a consequence of evolving to fill a variety of ecological niches on these two continents, Metatheria has undergone two major adaptive radiations and displays a vast array of behaviour. Therefore, generalisation of their actions is difficult. Arboreal, marine, or fossorial marsupials can be, and at least one species is semi-aquatic. Walking, gliding, jumping, racing, and swimming can be used in their locomotion. Metatheres will greatly impact their populations and ecosystems in a number of ways with their great diversity of food preferences, behaviour, and habitat use. Metatheres, for instance, can help pollinate plants, distribute seeds, or manage populations of pests. For other animals, most animals are prey and are therefore an integral component of several food chains. For other organisms, species which dig burrows build habitat and/or help aerate the soil. Of course, marsupial parasites are as diverse as their host.

Note:- Around 272 species belong to the group of Metatherian mammals, also known as marsupials. They are an ancient group, very varied in body shape, and they occupy a vast variety of ecological niches.