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Reptiles share which of the following characters with birds and mammals?
A. Amnion
B. Homeothermy
C. Diaphragm
D. Nipple

seo-qna
Last updated date: 27th Mar 2024
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MVSAT 2024
Answer
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Hint: The Aves are members of the Chordata phylum of the animal kingdom. It is home to almost nine thousand species. Aves have evolved to be able to fly. The Aves class includes all of the birds. Courtship, parental care, nest building, and territorial behaviour are all displayed.
The class Aves is divided into two categories: - Archaeornithes and neornithes
Warm Bloodedness is a trait shared by birds and animals since they are highly evolved organisms with internal temperatures that are independent of the external environment.

Complete answer:
Option A: The amnion, yolk sac, chorion, and allantois are four extraembryonic membranes found in reptile, avian, and mammalian embryos.
In an amniotic sac filled with amniotic fluid, the embryo is protected by amnion.
Yolk sac contains yolk, which is a food source.
Chorion is involved in the gas exchange between the embryo and the surrounding environment.
Allantois is a plant that stores the embryo's metabolic waste.
So, option A is correct.
Option B: Reptiles, birds, and mammals are all amniotes, and they all have a shelled egg protected by amniotic membranes, waterproof skin, and rib ventilation of the lungs.
So, option B is not correct.
Option C: Air is pushed in and out of the respiratory system by pressure changes in the air sacs in birds, who lack a diaphragm. The lungs of birds do not expand and contract like those of mammals. The exchange of oxygen and carbon dioxide in mammalian lungs takes place in small sacs called alveoli.
So, option C is not correct.
Option D: Because birds are not mammals, they lack nipples. Despite the fact that we're talking about bird breasts, they lack the mammary glands that mammals employ to feed their young milk. The term "breast" refers to the pectoral muscles that birds use to fly.
So, option D is not correct.

Hence, Option A is the correct answer.

Note:
When the embryo is originally created, the amnion is a membrane that wraps it tightly. It fills with amniotic fluid, causing the amnion to expand and form the amniotic sac, which protects the growing embryo or foetus. The amnion forms a protective sac around the embryo, together with the chorion, yolk sac, and allantois.The protective sac is contained in a shell in birds, reptiles, and monotremes. It is encased in a uterus in marsupials and placental mammals.
The amnion belongs to the Amniota clade of vertebrates, which includes reptiles, birds, and mammals. Amphibians and fish do not have the amnion because they are not amniotes.
The extraembryonic somatic mesoderm on the outside and the extraembryonic ectoderm or trophoblast on the inside make up the amnion.