Embryonic Development

A holoblastic cleavage producing blastomeres of equal size

 Eustachian tube originates from mesoderm.

Ectoderm in the frog forms lens and retina of the eye along with other sense receptors.

Hyaluronic acid is a highly viscous mucopolysaccharide that holds cells together in corona radiata, lubricates body tissue, and blocks the spread of microorganisms. It is found in the skin, the vitreous humor of the eye, and the synovial fluid of the joints.

It forms the embryonic skeleton.

The developing embryo has two main populations of cells: an inner cell mass and a trophectoderm. The trophectoderm cells lie at the outer surface of the developing embryo and will become the placenta.

Kidneys are derived from the pert of mesoderm, which is known as the intermediate mesoderm.

It is feature near the entrance of the seminal vesicles. It is evolved from the uterovaginal primordium.

These bones are characterised by more fibers in them. In humans, they are found only in developing embryo.

After the first trimester of pregnancy, or if pregnancy does not ensue, the corpus luteum deteriorates into a fibrous scar called a corpus albicans.

In humans, the embryo develops and grows in the uterus (womb), which provides the necessary environment and nourishment for embryonic and fetal development. Seminal vesicles and epididymis are male reproductive structures, while the oviduct (Fallopian tube) is where fertilization occurs, not where development happens.

The embryonic stage is the developmental phase occurring in the mother's womb, from implantation until about the 8th week of pregnancy in humans. A zygote is the single-cell stage immediately after fertilization, 'baby' is a post-birth term, and ovum is the egg cell.

This is the correct option as this is a feature of an embryo. It is multicellular.

The area of the plant embryo between the cotyledons and the radicle is called the hypcotyl.

In some plants, the ovary has only one chamber despite consisting of several fused carpels. In these plants, the placenta is central and called free central placentation.