Question

The animal without skull is

• A. Acrania
• B. Acephalia
• C. Apteria
• D. Acoelomate

Answer 1

The correct option is A

Acrania

The correct option is A:

Explanation for the correct option:

1. The disappearance of a fetal skull with freely uncover brain tissue to amniotic fluid is referred to as acrania.
2. Acrania frequently leads to anencephaly, and some experts believe it is the cause of all cases of anencephaly.
3. In the first trimester, both can be observed on ultrasound.

Explanation for the incorrect options:

Option B:

1. The animal without head or absence of a head in animal is called acephalia.
2. This is a birth defect.

Option C:

In many avian species or birds, the naked spaces or skin between the feathered areas is called apteria.

Option D:

The absence of a coelom and a body cavity is called acoelomate.

Final answer: The absence of a fetal skull in animal with freely uncover brain tissue to amniotic fluid is called acrania.