(d) Primary germ layers are ectoderm, endoderm & mesoderm. Many animals are primarily triploblastic, as endoderm (inner) and ectoderm (outer) interact to produce a third germ layer, called mesoderm (middle). Together, the three germ layers will give rise to every organ in the body, from skin and hair to the digestive tract.
NCERT Page-54 / N-38
Human Reproduction(NCERT)
286490
Which of the following hormones is produced in women only during pregnancy?
1 Relaxin
2 Estrogen
3 Oxytocin
4 Progesterone
Explanation:
(a)
NCERT Page-53 / N-37
Human Reproduction(NCERT)
286491
By the end of how many weeks, major organ system are formed during the embryonic development?
1 4 weeks
2 8 weeks
3 12 weeks
4 24 weeks
Explanation:
(c) By the end of 12 weeks (first trimester), most of the major organ systems are formed, for example, the limbs and external genital organs are well-developed.
NCERT Page-54 / N-38
Human Reproduction(NCERT)
286492
All of the following statements concerning pregnancy are accurate EXCEPT
1 the detection of human chorionic gonadotropin in the urine forms the basis for pregnancy tests.
2 the cyclic release of pituitary gonadotropins and ovarian steroids is continued.
3 the mammary gland tissue of the pregnant woman is stimulated to develop by placental hormones.
4 the corpus luteum of pregnancy maintains the uterus until the placenta is well established.
Explanation:
(b) The high levels of estrogen and progesterone in the maternal circulation during pregnancy inhibit the cyclic release of pituitary gonadotropins and prevent the menstrual cycles. Pregnancy hormones include hCG, which maintains the corpus luteum of pregnancy and forms the basis for pregnancy diagnosis urine tests. Ovarian and placental estrogen and progesterone, human placental lactogen, and pituitary prolactin stimulate development of the ducts and alveoli in the mammary glands.
(d) Primary germ layers are ectoderm, endoderm & mesoderm. Many animals are primarily triploblastic, as endoderm (inner) and ectoderm (outer) interact to produce a third germ layer, called mesoderm (middle). Together, the three germ layers will give rise to every organ in the body, from skin and hair to the digestive tract.
NCERT Page-54 / N-38
Human Reproduction(NCERT)
286490
Which of the following hormones is produced in women only during pregnancy?
1 Relaxin
2 Estrogen
3 Oxytocin
4 Progesterone
Explanation:
(a)
NCERT Page-53 / N-37
Human Reproduction(NCERT)
286491
By the end of how many weeks, major organ system are formed during the embryonic development?
1 4 weeks
2 8 weeks
3 12 weeks
4 24 weeks
Explanation:
(c) By the end of 12 weeks (first trimester), most of the major organ systems are formed, for example, the limbs and external genital organs are well-developed.
NCERT Page-54 / N-38
Human Reproduction(NCERT)
286492
All of the following statements concerning pregnancy are accurate EXCEPT
1 the detection of human chorionic gonadotropin in the urine forms the basis for pregnancy tests.
2 the cyclic release of pituitary gonadotropins and ovarian steroids is continued.
3 the mammary gland tissue of the pregnant woman is stimulated to develop by placental hormones.
4 the corpus luteum of pregnancy maintains the uterus until the placenta is well established.
Explanation:
(b) The high levels of estrogen and progesterone in the maternal circulation during pregnancy inhibit the cyclic release of pituitary gonadotropins and prevent the menstrual cycles. Pregnancy hormones include hCG, which maintains the corpus luteum of pregnancy and forms the basis for pregnancy diagnosis urine tests. Ovarian and placental estrogen and progesterone, human placental lactogen, and pituitary prolactin stimulate development of the ducts and alveoli in the mammary glands.
(d) Primary germ layers are ectoderm, endoderm & mesoderm. Many animals are primarily triploblastic, as endoderm (inner) and ectoderm (outer) interact to produce a third germ layer, called mesoderm (middle). Together, the three germ layers will give rise to every organ in the body, from skin and hair to the digestive tract.
NCERT Page-54 / N-38
Human Reproduction(NCERT)
286490
Which of the following hormones is produced in women only during pregnancy?
1 Relaxin
2 Estrogen
3 Oxytocin
4 Progesterone
Explanation:
(a)
NCERT Page-53 / N-37
Human Reproduction(NCERT)
286491
By the end of how many weeks, major organ system are formed during the embryonic development?
1 4 weeks
2 8 weeks
3 12 weeks
4 24 weeks
Explanation:
(c) By the end of 12 weeks (first trimester), most of the major organ systems are formed, for example, the limbs and external genital organs are well-developed.
NCERT Page-54 / N-38
Human Reproduction(NCERT)
286492
All of the following statements concerning pregnancy are accurate EXCEPT
1 the detection of human chorionic gonadotropin in the urine forms the basis for pregnancy tests.
2 the cyclic release of pituitary gonadotropins and ovarian steroids is continued.
3 the mammary gland tissue of the pregnant woman is stimulated to develop by placental hormones.
4 the corpus luteum of pregnancy maintains the uterus until the placenta is well established.
Explanation:
(b) The high levels of estrogen and progesterone in the maternal circulation during pregnancy inhibit the cyclic release of pituitary gonadotropins and prevent the menstrual cycles. Pregnancy hormones include hCG, which maintains the corpus luteum of pregnancy and forms the basis for pregnancy diagnosis urine tests. Ovarian and placental estrogen and progesterone, human placental lactogen, and pituitary prolactin stimulate development of the ducts and alveoli in the mammary glands.
(d) Primary germ layers are ectoderm, endoderm & mesoderm. Many animals are primarily triploblastic, as endoderm (inner) and ectoderm (outer) interact to produce a third germ layer, called mesoderm (middle). Together, the three germ layers will give rise to every organ in the body, from skin and hair to the digestive tract.
NCERT Page-54 / N-38
Human Reproduction(NCERT)
286490
Which of the following hormones is produced in women only during pregnancy?
1 Relaxin
2 Estrogen
3 Oxytocin
4 Progesterone
Explanation:
(a)
NCERT Page-53 / N-37
Human Reproduction(NCERT)
286491
By the end of how many weeks, major organ system are formed during the embryonic development?
1 4 weeks
2 8 weeks
3 12 weeks
4 24 weeks
Explanation:
(c) By the end of 12 weeks (first trimester), most of the major organ systems are formed, for example, the limbs and external genital organs are well-developed.
NCERT Page-54 / N-38
Human Reproduction(NCERT)
286492
All of the following statements concerning pregnancy are accurate EXCEPT
1 the detection of human chorionic gonadotropin in the urine forms the basis for pregnancy tests.
2 the cyclic release of pituitary gonadotropins and ovarian steroids is continued.
3 the mammary gland tissue of the pregnant woman is stimulated to develop by placental hormones.
4 the corpus luteum of pregnancy maintains the uterus until the placenta is well established.
Explanation:
(b) The high levels of estrogen and progesterone in the maternal circulation during pregnancy inhibit the cyclic release of pituitary gonadotropins and prevent the menstrual cycles. Pregnancy hormones include hCG, which maintains the corpus luteum of pregnancy and forms the basis for pregnancy diagnosis urine tests. Ovarian and placental estrogen and progesterone, human placental lactogen, and pituitary prolactin stimulate development of the ducts and alveoli in the mammary glands.
