Tag: different stages of growth

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Multiple choice biology for the continuity of generation reproductive systems different stages of growth reproductive system in humans

Consider the following three statements related to the human male reproductive system and select the correct option stating which ones are true (T) and which ones are false (F).


(i) The middle piece of spermatozoon is also termed as the powerhouse of the spermatozoon.
(ii) Vas deferens joins a duct from the seminal vesicle and forms vasa efferentia.
(iii) Semen is a collection of secretions from the seminal vesicles, prostate gland and Cowper's glands and sperms from testes.

  1. (i) - T, (ii) - F, (iii) - T

  2. (i) - F, (ii) - F, (iii) - T

  3. (i) - T, (ii) - T, (iii) - F

  4. (i) - F, (ii) - T, (iii) - T
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement (i) is true as the middle piece contains mitochondria (powerhouse). Statement (ii) is false because the vas deferens joins the seminal vesicle duct to form the ejaculatory duct, not vasa efferentia. Statement (iii) is true as semen is a mixture of fluids from these glands and sperm.

Multiple choice biology for the continuity of generation reproductive systems different stages of growth reproductive system in humans

Fill up the blanks in the following paragraph by selecting the correct option.
(i) are the primary female sex organs that produce (ii) and (iii). Each primary sex organ is about (iv) in length and is connected to the pelvic wall and uterus by (v).

  1. (i)-Testes, (ii)-sperms, (iii)-hormones, (iv)-4-5 cm, (v)-ligaments

  2. (i)-Ovaries, (ii)-oogonia, (iii)-follicles, (iv)-2-4 cm, (v)-muscles

  3. (i)-Ovaries, (ii)-ovum, (iii)-hormones, (iv)-2-4 cm, (v)-ligaments

  4. (i)-Testes, (ii)-sperms, (iii)-testosterone, (iv)-8-9 cm, (v)-muscles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ovaries are the primary female sex organs that produce the female gamete/germ cell ovum and several steroid hormones such as estrogen and progesterone also called ovarian hormones. Each ovary is about 2-4 cm in length and is connected by ligaments to the pelvic wall and the uterus.  Each ovary is whitish in colour and located alongside the lateral wall of the uterus and the other side points downwards attached to the uterus via the ovarian ligament.

So, the correct option is '(i)-Ovaries, (ii)-ovum, (iii)-hormones, (iv)-2-4 cm, (v)-ligaments'.

Multiple choice biology for the continuity of generation reproductive systems different stages of growth reproductive system in humans

Spot the odd one out from the following structures with reference to the male reproductive system.

  1. Rete testis

  2. Epididymis

  3. Vasa efferentia

  4. Isthmus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Females have two oviducts (or Fallopian tubes). Each oviduct has three regions, infundibulum, ampulla and isthmus. Isthmus is the narrow part closest to uterus, while infundibulum is the first part of oviduct that is encountered by released ova.

Multiple choice biology for the continuity of generation reproductive systems different stages of growth reproductive system in humans

Given below are the three statements each with two blanks. Select the option which correctly fills up the blank in any two statements. (A) Each seminiferous tubule is lined on Its inside by two types of cells called (i) and (ii) .
(B) The seminiferous tubules open into the  (i)  through  (ii).
(C) The enlarged end of penis called the   (i)   is covered by a loose fold of skin called the   (ii)  

  1. (A)-(i)spermatogonia, (ii) follicular cells

    (B)-(i) vas deferens, (ii) urethral meatus

  2. (B)-(i) vasa efferentia, (ii) rete testis

    (C)-(i) glans penis, (ii) foreskin

  3. (A)-(i) spermatogonia, (ii) Sertoli cells

    (C)-(i) urethral meatus, (ii) scrotum

  4. (A)-(i) spermatocytes, (ii) oogonia

    (B)-(i) rete testis, (ii) vasa efferentia
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The seminiferous tubule is present in the testicular lobule and is highly coiled and produces sperms. The seminiferous tubule opens into the vasa efferentia (small ducts) through the rete testis (a network of interconnecting tubules where the straight seminiferous tubules empty). The enlarged part of the penis or the male genitalia is called the glans penis or head of the penis (sensitive bulbous structure at the distal end of the human penis) and is covered by a foreskin (prepuce) a double-layered fold of smooth muscle tissue, blood vessels etc, to protect the glans penis and urinary meatus. 

So, the correct option  is, (B)-(i) vasa efferentia, (ii) rete testis (C)-(i) glans penis, (ii) foreskin.

Multiple choice biology for the continuity of generation reproductive systems different stages of growth reproductive system in humans

In retention growth model, payout ratio is subtracted from one to calculate.

  1. present value ratio

  2. future value ratio

  3. retention ratio

  4. growth ratio
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The retention ratio represents the portion of earnings kept by a company rather than paid out as dividends. It is calculated as 1 minus the dividend payout ratio.

Multiple choice biology for the continuity of generation reproductive systems different stages of growth reproductive system in humans

Assertion:  In humans, the gamete contributed by the male determines whether the child produced will be male or female.

Reason:  Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on X-chromosome and some on Y-chromosome

  1. If both the assertion and the reason are true and the reason

    is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The assertion is true because human sex determination is based on the sperm carrying either an X or a Y chromosome. The reason is false because sex determination in humans is chromosomal (XX/XY), not polygenic.

Multiple choice biology for the continuity of generation reproductive systems different stages of growth reproductive system in humans

Overall masculine development, Gynaecomastia is expressed when fertilization occurs between 

  1. Sperm (22A+X) $\times $ Egg(22A+XX)
  2. Sperm (23A+Y) $\times $ Egg(22A+X)
  3. Sperm (22A+XY) $\times $ Egg(22A+X)
  4. Sperm (22A+X) $\times $ Egg(22A+0)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Klinefelter syndrome is not inherited; the addition of an extra X chromosome occurs during the formation of reproductive cells (eggs or sperm) in one of an affected person's parents. During cell division, an error called nondisjunction prevents X chromosomes from being distributed normally among reproductive cells as they form. Typically, as cells divide, each egg cell gets a single X chromosome, and each sperm cell gets either an X chromosome or a Y chromosome. However, because of nondisjunction, an egg cell or a sperm cell can also end up with an extra copy of the X chromosome.

If an egg cell with an extra X chromosome (XX) is fertilized by a sperm cell with one Y chromosome, the resulting child will have Klinefelter syndrome. Similarly, if a sperm cell with both an X chromosome and a Y chromosome (XY) fertilizes an egg cell with a single X chromosome, the resulting child will have Klinefelter syndrome.

Mosaic Klinefelter syndrome (46,XY/47,XXY) is also not inherited. It occurs as a random error during cell division early in fetal development. As a result, some of the body's cells have the usual one X chromosome and one Y chromosome (46,XY), and other cells have an extra copy of the X chromosome (47,XXY).

So the correct option is ' Sperm (22A+XY) × Egg(22A+X)'.