Category: Biology Second Paper

The skin is red and wrinkled. Veins are visible on the skin. Fingerprints are visible. Eyelids begin to open. By the end of the sixth month, the baby is 30.48 cm long and weighs 2 pounds.

Hair grows on the head. The skin is covered with lanugo (soft hair). By the end of the fifth month, the fetus is 25.4 cm long and weighs 0.5-1 lb.

Eyelids, eyebrows, nails and hair develop. Arms and legs move. Can suck thumb. By the end of the fourth month, the fetus is 13 cm long and weighs 141 (5 oz) grams.

The skin of the head folds and ears are formed. Limbs and limbs are formed. Gill openings are seen in the tail and throat. By the end of the second month, the fetus is 2.6 cm long and weighs 0.95 g.

Fertilized ovum divides to form embryonal layer and primary organelles from embryonic layer. Then the embryonic coat, amara, umbilical cord, neural tube and body parts are formed. At this time the embryo is 0.25 cm long.

The fetus stays in the mother’s womb for about 9 months or 36-38 weeks and develops continuously.
1. First month: Fertilized ovum divides to form embryonal layer and primary organelles from embryonic layer. Then the embryonic coat, amara, umbilical cord, neural tube and body parts are formed. At this time the embryo is 0.25 cm long.
2. Second month: the skin of the head folds and ears are formed. Limbs and limbs are formed. Gill openings are seen in the tail and throat. By the end of the second month, the fetus is 2.6 cm long and weighs 0.95 g.
3. Third month: Fingers and toes develop. Reproductive organs are formed. By the end of the third month, the
4. Fourth month: Eyelids, eyebrows, nails and hair develop. Arms and legs move. Can suck thumb. By the end of the fourth month, the fetus is 13 cm long and weighs 141 (5 oz) grams.
5. Fifth month: Hair grows on the head. The skin is covered with lanugo (soft hair). By the end of the fifth month, the fetus is 25.4 cm long and weighs 0.5-1 lb.
6. Sixth month: The skin is red and wrinkled. Veins are visible on the skin. Fingerprints are visible. Eyelids begin to open. By the end of the sixth month, the baby is 30.48 cm long and weighs 2 pounds.
7. Seventh month: Fat accumulates in the body. The hearing organ is fully developed. Responds to sound, pain and light. At this time, the baby is 35.55 cm long and weighs 4 pounds.
8. Eighth month: Baby grows rapidly and can see and hear. All organs are developed except the lungs. At that time the child was 45.70 cm tall and weighed 5 pounds.
9. Ninth month: Lungs are fully developed. The baby’s eyes blink, head nods and fingers clench. Responds to light, sound and touch. At that time the child was 50.80 cm long and weighed 7 pounds.

In the third month, the human fetus is about 13 cm long and weighs 141 grams. It is called fitas. The fetus stays in the mother’s womb for about 9 months or 36-38 weeks and develops continuously.

The process by which various organs are formed from the embryonic stage is called organogenesis. A specific cell mass forms a specific organ. First, rudimentary buds are formed from the embryonic layer. Later, specific organs are formed from the organelles.

The process by which gastrula stage is formed from blastula is called gastrulation. In this process, the cells change rapidly and are arranged in two layers. The outer one is called ectoderm and the inner one is called endoderm. Later mesoderm is formed from ectoderm. A fluid-filled cavity forms inside the gastrula. It is called archenteron. The opening through which the archenteron is released is called the blastopore.

The process by which the zygote divides to form a multicellular embryo is called cleavage. As a result of division, the zygote becomes a sterile sphere with 16-32 cells. This is the marula stage and the cells are called blastomeres. The process of morula formation is called morulation. The cells of the marula dasa are arranged in a layer and a cavity filled with fluid is formed inside. This stage is called blastula. The cell layer of the blastula stage is called the blastoderm and the cavity is called the blastocoel. Cleavage process ends with the development of blastula stage.