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Trueman Test: Human Reproduction - 2


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20 Questions MCQ Test Biology Class 12 | Trueman Test: Human Reproduction - 2

Trueman Test: Human Reproduction - 2 for NEET 2023 is part of Biology Class 12 preparation. The Trueman Test: Human Reproduction - 2 questions and answers have been prepared according to the NEET exam syllabus.The Trueman Test: Human Reproduction - 2 MCQs are made for NEET 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Trueman Test: Human Reproduction - 2 below.
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Trueman Test: Human Reproduction - 2 - Question 1

All of the following are true of gametes except

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 1
  • Gametes are formed by meiosis of germ cells. Hence, they are haploid.
  • Gametes are produced through the process of meiosis.
  • In males, gametes are produced in testes and in females, gametes are produced in ovaries.
  • Since gametes are formed through meiosis, they undergo two set of divisions: meiosis I and meiosis II. 
  • During meiosis, recombination occurs in which homologous pairs of chromosomes exchange their segments. Since gametes are formed through meiosis, therefore they have chromosomes that have undergone recombination.
Trueman Test: Human Reproduction - 2 - Question 2

The stage during which menstruation stops in the adult female is

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 2 After the age of 45, the number of ovarian follicles decreases and the ovaries become less responsive to luteinizing hormone and follicle-stimulating hormone. Hence the ovaries stop producing estrogen and progesterone. So the menstrual cycle stops and reproductive capacity is arrested. Menopause marks the end of the reproductive phase. Thus the correct answer is option A.

Trueman Test: Human Reproduction - 2 - Question 3

In centrolecithal eggs, the cleavage is

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 3 Meroblastic cleavage is seen in centrolecithal eggs in which yolk is located in the centre of the egg.

Trueman Test: Human Reproduction - 2 - Question 4

Polar body is produced during the formation of

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 4

Polar body is a small degenerate cell that forms after during oogenesis. During meiosis, the first polar body is formed when the secondary oocyte is formed. The polar bodies do not take part in fertilization.

Trueman Test: Human Reproduction - 2 - Question 5

Which of the following develops from endoderm?

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 5 Thymus epithelial cells, the lining of the follicles of the thyroid gland liver and pancreas are developed from endoderm.

So the correct answer is 'Liver, pancreas and thymus/thyroid.'

Trueman Test: Human Reproduction - 2 - Question 6

The mammalian follicle was first described by

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 6 Karl Ernst von Baer was the first to discover the egg of the mammal in the ovary. Regner de Graaf discovered follicles in the human ovary in 1671 and considered them to be eggs. Since Graaf discovered follicles, they are also called as Graafian follicles. Robert Brown named the cell nucleus in 1827. Spallanzani was the first to disprove spontaneous generation theory. Thus, the correct answer is option B.

Trueman Test: Human Reproduction - 2 - Question 7

Placenta in human beings is formed by

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 7 The placenta is an organ that connects the developing foetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply, fight against internal infection and produce hormones to support pregnancy. In humans, the placenta usually has a disc shape and it is formed by allantois, chorion and uterine wall.

Trueman Test: Human Reproduction - 2 - Question 8

Which of the following hormones initiate parturition?

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 8 Parturition is the process in which a mother gives birth to its young one. It initiates when the message initiating parturition starts with the fetal brain, its control of ACTH release from the pituitary, and increased cortisol production by the fetal adrenal. The cortisol stimulates placental enzymes which cause placental progesterone to be made into estrogen. Oxytocin leads to the contraction of smooth muscles of myometrium of the uterus, which directs the full-term foetus towards the birth canal.

So the correct option is 'ACTH, corticosteroid, oxytocin'.

Trueman Test: Human Reproduction - 2 - Question 9

Testosterone is secreted by____.

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 9

Testosterone is produced by the gonads (by the Leydig cells in testes in men and by the ovaries in women), although small quantities are also produced by the adrenal glands in both sexes. It is an androgen, meaning that it stimulates the development of male characteristics.

Trueman Test: Human Reproduction - 2 - Question 10

Fertilisation takes place in the

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 10
  • Fertilization takes place in the oviduct. Oviduct is also called a Fallopian tube.
  • Oviduct is where most fertilization happens for humans. It can occur in the upper portion of the uterus or it could even happen on the outside of the reproductive tract in the event of inflammatory disease in the pelvic region. This would create an ectopic pregnancy which is a serious occurrence.
  • The menstrual cycle gets the woman's body ready and about halfway through human fertilization begins. The egg reaches ovulation and is released into the oviduct where fertilization will take place.
  • If the egg becomes fertilized no other sperm is able to penetrate the egg. The genes of the baby are determined the moment the egg is fertilized. Sperm with a Y chromosome means it's a boy and an X chromosome it's a girl.
  • While the egg remains in the oviduct for up to 4 days it starts to divide into cells just 24 hours once it has been fertilized. The main focus of the egg is to implant itself into the side of the uterus. After about 3 weeks the first nerve cells of the baby have been formed.
     
Trueman Test: Human Reproduction - 2 - Question 11

Seminal plasma, the fluid part of semen, is contributed by
(i) seminal vesicle
(ii) prostate
(iii) urethra
(iv) bulbourethral gland

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 11

Seminal plasma is the fluid part of semen and is contributed by seminal vesicles, prostate gland and bulbourethral glands. Seminal vesicles contribute fructose, citric acid and other nutrients as well as fibrinogen and prostaglandin. Secretions from prostate gland contain calcium ions, phosphate Ion, etc. and are alkaline in nature. Bubo urethral glands secrete alkaline mucus which is important for the lubrication of penis.

Trueman Test: Human Reproduction - 2 - Question 12

Development of secondary sexual characters in females are controlled by

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 12 Oestrogens regulate growth and development of female accessory reproductive organs, secondary sexual character and sexual behaviour.

Trueman Test: Human Reproduction - 2 - Question 13

Fixing up of blastocyst in the wall of the uterus is

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 13 The fixing of the blastocyst in the wall of the uterus is known as implantation. The implantation takes place after seven days of fertilization.

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Trueman Test: Human Reproduction - 2 - Question 14

The signals for parturition originate from

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 14 Parturition is the process of giving birth or delivery. The signals for parturition originate from the placenta as well as the fully developed foetus. Both these induce uterine contractions. These uterine contractions are called as foetal ejection reflex. This then stimulates the release of oxytocin hormone from the maternal pituitary gland.

Trueman Test: Human Reproduction - 2 - Question 15

Human eggs are

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 15

In general eggs of mammals have a little yolk. The human egg is alecithal meaning it is totally devoid of yolk. Hence, the human zygote gets implanted in the uterus of female and the egg or zygote is not laid. Humans are viviparous and females give birth to young ones.

Trueman Test: Human Reproduction - 2 - Question 16

Oogenesis starts____.

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 16

Oogenesis occurs in the outermost layers of the ovaries. Oogenesis starts with a germ cell called oogonium and undergoes mitosis to increase in number. The process of oogenesis takes place in the following three stages: Pre-natal.

Trueman Test: Human Reproduction - 2 - Question 17

Ovulation in the human female normally takes place during the menstrual cycle

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 17 Ovulation occurs about midway through the menstrual cycle, after the follicular phase, and is followed by the luteal phase.

Trueman Test: Human Reproduction - 2 - Question 18

After ovulation Graafian follicle regresses into

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 18 During ovulatory phase, LH induces rupturing of Graafian follicle and during secretory phase, empty Graafian follicle changes into corpus luteum.

Trueman Test: Human Reproduction - 2 - Question 19

Immediately after ovulation, the mammalian egg is covered by a membrane known as

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 19 Immediately after ovulation, the layer that forms around the ovum is called corona radiata.

Trueman Test: Human Reproduction - 2 - Question 20

If mammalian ovum fails to get fertilised, which one of the following is unlikely?

Detailed Solution for Trueman Test: Human Reproduction - 2 - Question 20 If mammalian ovum fails to get fertilized, the oestrogen secretion does not decrease further, while corpus luteum will disintegrate. Primary follicle starts developing and progesterone secretion rapidly declines.
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