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Human Reproduction Test - 91

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Human Reproduction Test - 91
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Weekly Quiz Competition
  • Question 1
    1 / -0
    All of the following associations of germinal tissues and developed tissue are correct except
    Solution

    • Germ layer specification in the blastula results in formation of the three germ layers: mesoderm, endoderm, and ectoderm.
    • Ectoderm develops into parts of the skin, the brain and the nervous system.
    • Mesoderm gives rise to bones, muscles, the heart and circulatory system, and internal sex organs. 
    • Endoderm turns into the inner lining of some systems, and some organs such as the liver and pancreas.
    • So, the correct option is 'Mesoderm: pancreas'.
  • Question 2
    1 / -0
    The fetal development includes which of the following features?
    Solution
    In developing foetus,  Ductus arteriosus is a blood vessel which connects pulmonary artery to the proximal descending aorta. Foramen ovale is the opening present in foetal heart that allows blood flow from right atrium to left atrium. Foetal haemoglobin shows higher affinity for oxygen as compare to adult. Thus option E is the correct answer.

  • Question 3
    1 / -0
    Ectoderm: endoderm : : ......... : .............
    Solution
    Ectoderm and endoderm are the outermost and innermost germinal layers which appear on animal embryo during early stages of development. 
    1. Ectoderm gives rise to hair, epithelial layer of various tissues and organs (including epidermis of skin), nails or hooves, retina of eyes, etc.
    2. Endoderm gives rise to gut tube including stomach, intestines, cecum, pancreas and liver along with other organs like lungs, thymus, prostate, etc.
    So, the correct answer is 'Retina: lungs'.
  • Question 4
    1 / -0
    Which of the following is not associated with the blastula stage of embryonic development?
    Solution

    • The blastula is usually a spherical solid layer of cells surrounding a fluid-filled or yolk-filled cavity (the blastocoel).
    • Cells migrate to the interior of the blastula, subsequently forming two (in diploblastic animals) or three (triploblastic) germ layers. The embryo during this process is called a gastrula.
    • The zygote undergoes many cleavages (divisions) to develop into a ball of cells called a morula and when the fluid-filled cavity (blastocoele) is formed, the early embryo becomes a blastula.
    • So, the correct option is 'It is a less advanced stage than morula'.
  • Question 5
    1 / -0
    Select the incorrect statement.
    Solution
    Correct Option: C
    Explanation:

    • LH is a Luteinizing hormone produced by the gonadotropic cells in the anterior pituitary gland. It plays an important role in puberty, menstruation, and fertility. It triggers ovulation and the development of the corpus luteum. 
    • In males, LH triggers the secretion of androgen called testosterone from the Leydig cells. FSH is a follicle-stimulating hormone produced by gonadotropic cells in the anterior pituitary gland.
    • It helps in the regulation of development, growth, pubertal maturation and reproductive processes of the body.
    • It stimulates the Sertoli cells of the testicles and helps in spermatogenesis, production of sperm. 
    • During the follicular phase, the LH and FSH increase gradually. They stimulate follicular development and estrogen secretion by follicular cells.
  • Question 6
    1 / -0
    Vegetal hemisphere of frog's egg has
    Solution
    The embryo is generally divided into 2 poles, the animal pole and the vegetal pole. The vegetal pole in the frog consists of yolk whereas the animal pole contains melanin granules so it is dark in colour. The grey crescent is present in between the animal pole and vegetal pole.
    So, the correct answer is 'Yolk'
  • Question 7
    1 / -0
    Grey crescent develops in
    Solution
    Grey crescent is a crescent like and grey colored area developing on the surface of amphibian egg opposite to the point of sperm entry.
    It is a surface feature developing as a result of cytoplasmic movements stimulated by sperm entry in the egg.
    So, the correct answer is 'Fertilised egg of frog'.
  • Question 8
    1 / -0
    Which of the following hormone interferes with the prolactin, preventing the mammary glands from lactation?
    Solution
    The function of progesterone is to promote the development of the mammary glands in preparation for lactation. Prolactin secreted by the anterior pituitary stimulates the production of milk, but it is prevented from exerting its effect on milk secretion by elevated levels of progesterone. It is also known as maternity hormone.
    Thus the correct answer is option B.
  • Question 9
    1 / -0
    Conversion of blastula into gastrulla is 
    Solution
    • During formation of gastrula, cells migrate to the interior of the blastula, subsequently forming two (in diploblastic animals) or three (triploblastic) germ layers.
    • Morphogenesis is the process that causes an organism to develop its shape. 
    • Development of germ layers in gastrula is an example of morphogenesis as here germ layers later determines various tissue differentiation, their relative arrangements and shape of organs.
    • So, the correct option is 'Morphogenesis'.
  • Question 10
    1 / -0
    Accessory ducts of reproductive system of human female includes
    Solution
    The female reproductive system is composed of the reproductive organs and accessory ducts and glands. The oviduct, uterus, and vagina are the accessory ducts which are involved in the process of reproduction. The oviduct is the site for fertilisation of the egg and the sperm. The uterus is the site for implantation and the vagina acts as the birth canal.
    Thus the correct answer is option B. 
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