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    appearance of hair on the head of human embryo occurs at this month of pregnancy

    Mohammed

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    The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?

    The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?

    Byju's Answer Standard IX Biology

    Female Reproductive System

    The first mov... Question

    The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?

    A Fifth month B Fourth month C Third month D Sixth month Open in App Solution

    The correct option is A

    Fifth month

    The correct option is A:Explanation for correct answer:

    Human pregnancy lasts approximately 9 months.

    The three germinal layers, namely ectoderm, endoderm, and mesoderm, give rise to all of the tissues and organs found in an adult.

    In the fifth month, the foetus makes its first movement.

    Hair growth in the head occurs during this time period.

    The skin is covered with a whitish coating called vernix caseosa.

    This "cheesy" substance is thought to protect foetal skin from long exposure to amniotic fluid.

    Explanation for incorrect option;Option B:

    Taste buds and the ability to hear develop in the fourth month.

    The foetal heartbeat may now be audible through an instrument called a doppler.

    The reproductive organs and genitalia have reached full maturity.

    On ultrasound this month, the doctor can see if the foetus will be designated male or female at birth.

    Option C:

    All of the major organ systems have developed by the end of the first trimester, or third month.

    In the fourth week of this month, the heart is the first organ to begin functioning.

    The heart begins to beat.

    Arm buds and optic pits are revealed.

    Option D:

    Eyelashes are formed by the end of the second trimester, which is 24 weeks or 6 months.

    Foetus's skin which is reddish in colour, wrinkled and veins are visible through translucent skin.

    The finger and toe prints are visible.

    In this stage, the eyelids begin to part and the eyes open.

    Final answer: The first movements of the fetus and the appearance of hair on its head are usually observed during the fifth month of pregnancy.

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    SIMILAR QUESTIONS

    Q. During pregnancy, the foetus shows its first movement in the ________.Q. The rapid growth of the foetus followed by development of the brain and the heart occurs during __________ week of the pregnancy.Q. Formation of eyelashes, separation of eyelids and hair growth on the body of the foetus are usually observed duringQ. What are the effects of hypothyroidism (observed during pregnancy) on the development and maturation of a growing baby?Q. 1. By the end of the __a__ of pregnancy, the foetus develops limbs and digits.

    2. By the end of __b_ the body is covered with fine hair, eyelids separate and eyelashes are formed.

    3. After ___c____ of pregnancy, the embryo's heart is formed.

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    Female Reproductive System

    Standard IX Biology

    स्रोत : byjus.com

    The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?

    Click here👆to get an answer to your question ✍️ The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?

    Question

    The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy? 

    A

    Fourth month

    B

    Fifth month

    C

    Sixth month

    D

    Third month

    Medium Open in App

    Updated on : 2022-09-05

    Solution Verified by Toppr

    Correct option is A)

    The appearance of hair on the head of the fetus and initial movements called Quickening takes place between the 14th to 16th month of pregnancy.

    So, the correct answer is 'Fourth month'.

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    The first movement of the fetus and appearance of hair on its head is usually observed during which month of pregnancy?A) Third monthB) Fourth monthC) Fifth monthD) Sixth month

    The first movement of the fetus and appearance of hair on its head is usually observed during which month of pregnancy?A) Third monthB) Fourth monthC) Fifth monthD) Sixth month . Ans: Hint: In animals such as mammals, the time from which fertilizati...

    The first movement of the fetus and appearance of hair on its head is usually observed during which month of pregnancy?

    A) Third month B) Fourth month C) Fifth month D) Sixth month

    Last updated date: 21st Jan 2023

    • Total views: 219.6k • Views today: 2.16k Answer Verified 219.6k+ views

    Hint: In animals such as mammals, the time from which fertilization occurs, till the female gives birth to the offspring is known as the Gestational period. During this process, the fertilized ovum forms the zygote later gets developed into the embryo and finally to a fully developed fetus. A series of marked changes occur during this period. The duration of the gestational period is different for different organisms. In humans, this is roughly about forty months or nine months.Complete answer :

    The development of the embryo is also known as embryogenesis. It includes both cell division as well as differentiation. The period until implantation occurs is known as the germinal stage. During this phase active cell division occurs. Leads to the formation of a blastocyst or blastula. The next stage is gastrulation. And later the various embryonic layers are formed. It is further followed by neurulation and organogenesis respectively. Different organs get formed and developed at different stages of pregnancy.

    The fifth month of development is characterized by the movement of the fetus within the womb, the first movement shown by the fetus is called quickening. It is also characterized by the development of body hair. At this time, the muscles also start to develop.

    Considering the other given options:

    A.Third month, the arms, feet, toes, fingers, as well as hands, develop completely. The finer and toenails are starting to grow. The development of reproductive organs also starts. Thus it is not the right option.

    B. In the fourth month, the heartbeat of the fetus can be listened to, through a Doppler test. The fingers, as well as toes, get completely formed. Thus it is not the right option.

    D. In the sixth month, the fingerprints are formed. The eyes open, and the eyelids get separated. Thus it is not the right option.

    Therefore, from the above-given options, the most appropriate answer is C. That is, The first movement of the fetus and the appearance of hair on its head are usually observed during the fifth month of pregnancy.Note:

    During fetal development, and associated structure also developed known as the placenta, attached to the fetus. It helps as a medium for the transfer of materials from the mother to the fetus, and also acts as a barrier for certain materials. During childbirth, the placenta is also expelled out.

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