Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Some placental animals provide nutrients to their embryos from an attached membranous yolk-containing sac. They are called:

a. oviparous animals.

b. ovoviviparous animals.

c. metatherians.

d. eutherians.

e. hermaphrodites.

Summary Introduction


Sexual reproduction results in the birth of an offspring, which depends upon the contribution of both parents. After the egg has been fertilized by the sperm; the parent body provides nutrition to the developing embryo. Nutrition to the developing embryo depends upon the reproduction system of the parent, which includes viviparity, oviparity, and viviparity.


Justification/Explanation for the correct answer:

Option (c) is metatherians. Metatherians (marsupials) are also known as nonplacental animals. They have a placenta, which is less complex. The placenta nourishes the developing embryo from the yolk-containing sac. The gestation period is generally small and the offspring given birth does not have fully developed organs. Kangaroo and Dasyurus are some examples of marsupials. Hence, option (c) is correct.

The explanation for the incorrect answers:

Option (a) is given as oviparous animals. The animals that are able to lay eggs are known as oviparous animals. The egg contains the nutrients that are required for the nourishment of the developing embryo. These also include monotremes, which lay eggs but feed the offspring externally. So, it is an incorrect option.

Option (b) is give as ovoviviparous animals. The oviparous animals lay eggs inside their body. The eggs hatch within the body of the female, when the development is complete and offspring is finally born...

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