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Test: Parturition and Lactation (NCERT) - NEET MCQ


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10 Questions MCQ Test Biology Class 12 - Test: Parturition and Lactation (NCERT)

Test: Parturition and Lactation (NCERT) for NEET 2024 is part of Biology Class 12 preparation. The Test: Parturition and Lactation (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Parturition and Lactation (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Parturition and Lactation (NCERT) below.
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Test: Parturition and Lactation (NCERT) - Question 1

What is the correct sequence for parturition to occur?

Detailed Solution for Test: Parturition and Lactation (NCERT) - Question 1
  • Parturition starts with the signal released by the fetus and the placenta.
  • These act on the pituitary to release oxytocin.
  • Oxytocin acts as a stimulant leading to contractions of the uterine muscles.
  • The uterine contractions feedbacks to release more oxytocin from the pituitary.
  • This results in more powerful contractions of the uterus until the baby is delivered in the process of parturition.
Test: Parturition and Lactation (NCERT) - Question 2

Read the following statements carefully and select the correct statements.
(i) hPL plays a major role in parturition.
(ii) Fetus shows movements first time in the 7th month of pregnancy.
(iii) Signal for parturition comes from fully developed fetus and placenta.
(iv) Embryo's heart is formed by the 3rd month of pregnancy.

Detailed Solution for Test: Parturition and Lactation (NCERT) - Question 2

Signal for parturition comes from fully developed fetus and placenta. Oxytocin and relaxis play major role in parturition fetus shows movements first time during fifth month pregnancy. Embryo's hearth is formed after the first month pregnancy.

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Test: Parturition and Lactation (NCERT) - Question 3

Given below are three statements each with one or two blanks. Select the option which correctly fills up the blanks in any two statements.
(A) In human beings, menstrual cycle ceases around 50 years of age; this is termed as (i).
(B) The milk produced during the initial few days of lactation is called (i) which contains several (ii) absolutely essential to develop resistance for the new-born babies.
(C) At the completion of the (i) division, the primary oocyte divides into secondary oocyte and (ii).

Detailed Solution for Test: Parturition and Lactation (NCERT) - Question 3

(A) In human beings, the menstrual cycle ceases around 50 years of age; this is termed as "menopause." Menopause is a natural biological process that marks the end of a woman's reproductive years. During menopause, the ovaries stop releasing eggs, and the levels of certain hormones, such as estrogen and progesterone, decrease. 

(B) The milk produced during the initial few days of lactation is called "colostrum." Colostrum is a specialized form of breast milk that is rich in essential nutrients and antibodies. It contains several bioactive compounds absolutely essential to develop resistance for newborn babies. These antibodies help protect the infant from infections and provide important nutrients for their early growth and development.

(C) At the completion of the "meiosis I" division, the primary oocyte divides into the "secondary oocyte" and a smaller cell called the "first polar body." Meiosis is the process by which germ cells (eggs and sperm) are formed. In meiosis I, the primary oocyte undergoes a reduction in chromosome number, resulting in the formation of the secondary oocyte and the first polar body. The secondary oocyte is the cell that can potentially be fertilized by a sperm, while the first polar body usually degenerates and does not play a direct role in reproduction.

Test: Parturition and Lactation (NCERT) - Question 4

The third stage of parturition is called "after-birth". In this stage

Detailed Solution for Test: Parturition and Lactation (NCERT) - Question 4

Third stage of parturition (placental stage) is the time after the delivery until the placenta or after birth is expelled by powerful uterine contractions. Umbilical cord is cut close to the baby's navel. It lasts for 10−15 minutes after the birth of child.

Test: Parturition and Lactation (NCERT) - Question 5

After birth, colostrum is released from mammary glands which is rich in

Detailed Solution for Test: Parturition and Lactation (NCERT) - Question 5

After birth, the first milk released by mammary glands is called colostrum. It is released for 2−3 days. It is thin, yellowish fluid containing cells from the alveoli of glandular tissue of mammary glands and is rich in protein, antibodies, but low in fat.

Test: Parturition and Lactation (NCERT) - Question 6

Breast feeding suspends pregnancy due to

Detailed Solution for Test: Parturition and Lactation (NCERT) - Question 6

During breast feeding, prolactin hormone (required for the release of milk) present in the blood, inhibits the release of LH from pituitary. This will counter the effect of LH on the ovarian follicles and therefore no ovulation will occur. Hence, no pregnancy occurs during this period

Test: Parturition and Lactation (NCERT) - Question 7

Match column I with column II and select the correct option from the codes given below.

Detailed Solution for Test: Parturition and Lactation (NCERT) - Question 7

Fertilization is the process in which a sperm cell (from the male) combines with an egg cell (from the female) to form a zygote. This fusion of genetic material results in the formation of a single diploid cell, which will eventually develop into an embryo. It typically occurs in ampulla of fallopian tube.

Cleavage is a series of rapid cell divisions that occur shortly after fertilization. These divisions lead to the formation of a multicellular structure called a blastula. Cleavage takes place of isthmus of oviduct.

Morula is a solid mass of cells that results from several rounds of cleavage divisions. It is the early-stage embryo consisting of 16 or more cells. It is formed in the later part of oviduct.

Blastocyst is a more advanced stage of embryonic development. It is a hollow, fluid-filled structure with two distinct cell layers: the inner cell mass, which will develop into the embryo, and the outer trophoblast, which will form the placenta. The blastocyst reaches the uterus and typically implants into the uterine wall during this stage.

Parturition refers to the process of childbirth or labor. It involves the series of events that lead to the expulsion of the developing fetus from the mother's uterus, ultimately resulting in the birth of the baby. It occurs via cervix and vagina, combinely knon as 'birth canal'.

Test: Parturition and Lactation (NCERT) - Question 8

Delivery of developed foetus is scientifically called 

Detailed Solution for Test: Parturition and Lactation (NCERT) - Question 8

Parturition is the act of expelling the full-term young one from the mother's uterus at the end of gestation. Gestation (pregnancy) is completed in about 266 days from the mother's last menstruation.

Test: Parturition and Lactation (NCERT) - Question 9

Match column I with column II and select the correct options from the codes given.

Test: Parturition and Lactation (NCERT) - Question 10

Production of milk by mammary glands of female towards the end of pregnancy is called _________

Detailed Solution for Test: Parturition and Lactation (NCERT) - Question 10

Mammary gland cells develop the potential to produce milk towards the end of pregnancy. This process is termed as lactation.

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