Question

If in an embryo, the germ layer formation is without the formation of a distinct ectoderm, which of the following structures are most likely to not develop?

• A. Gonads
• B. Cardiac muscle tissue
• C. Bones
• D. Neurons

Answer 1

The correct option is D Neurons

During the process of gastrulation, there is the formation of the three germ layers- ectoderm, endoderm and mesoderm. Each of the three germ layers gives rise to specific tissues, organs and organs systems.

Neurons are the structural and functional unit of the nervous system. They help in the conduction of nerve impulses throughout the body. They are derived from the ectoderm when it undergoes multiplication and differentiation to form the spinal cord, peripheral nerves and the brain.

Gonads refer to the primary sex organs found in both males and females. They are responsible for the formation of gametes and sex hormones.

Cardiac muscle tissues are found in the heart. They help the heart muscles to contract and relax so as to make them be able to pump blood throughout the body. Bones are special connective tissues with a hard and non-pliable matrix.

Gonads, cardiac muscle tissues, and bones are derived from the mesoderm.