Human Reproduction - Online Test
Q1. Amniotic fluid is
Answer : Option B
Explaination / Solution:
The inner foetal membrane invests the embryo and forms a space called amniotic cavity. It is filled with fluid called amniotic fluid. It is useful for studying chromosomal abnormalities of foetus.
Q2. Haploid nucleus of sperms and a haploid ovum fuse together to form
Answer : Option B
Explaination / Solution:
Haploid nucleus of sperms and a haploid ovum fuse together to form diploid zygote. Zygote undergoes mitotic division to form embryo and fetus.
Q3. Mitotic division in zygote as it moves through the isthmus of oviduct is called
Answer : Option A
Explaination / Solution:
Zygote undergoes mitotic division as it moves through the isthmus of oviduct by cleavage to form 2, 4,8,16 blastomeres.
Q4. Finger-like projections appear on the trophoblast after implantation is called
Answer : Option C
Explaination / Solution:
After implantation of blastocysts, finger-like projections appear on the trophoblast called chronic villi which is surrounded by the uterine tissue and maternal blood.
Q5. Inner cell mass (embryo) contain certain cells that contain cells called stem cells which have potency to
Answer : Option A
Explaination / Solution:
The inner cell mass contain certain cells that contain cells called stem cells which have potency to give rise all the tissues and organs. Now a day’s stem cells are preserved for future use.
Q6. Which of the following is formed first out of the following in growing foetus
Answer : Option A
Explaination / Solution:
The heart is formed first in foetus after one month of pregnancy. Limbs and digits after second months, limbs and external genital organs after three months and eye lids and hair after six months.
Q7. Which of the following group of hormones are produced during pregnancy?
Answer : Option A
Explaination / Solution:
Human chorionic gonadotropin (hCG), human placental lactogens (hCL) and relaxin are produced in human females only during pregnancy.
Q8. Parturition occurs due to release of hormone oxytocin that cause
Answer : Option C
Explaination / Solution:
Oxytocin hormone is released by foetal ejection reflex from maternal pituitary gland that causes stronger and stronger uterine contraction that leads to ejection of baby through birth canal.
Q9. Statement I: During growth of embryo limbs and external genital organ is formed by the ends of 12 weeks.
Statement II: The sex of the developing embryo can be determined using ultrosonography after 3 months of pregnancy.
Statement II: The sex of the developing embryo can be determined using ultrosonography after 3 months of pregnancy.
Answer : Option D
Explaination / Solution:
During growth of embryo limbs and external genital organs is formed by the ends of 12 weeks (3 months). Ultrosonography can be used to know the sex of foetus after this period as genital organs are formed.
Q10. Assertion: Just after implantation, embryo (inner cell mass) differentiates into ectoderm, mesoderm and endoderm.
Reason: These three layers give rise to all tissues and organs in adult human beings.
Answer : Option A
Explaination / Solution:
After implantation, embryo differentiates into outer layer called ectoderm, middle layer mesoderm and inner layer endoderm. These three layers forms the all tissues or organs of human beings.
