Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology biodiversity and classification monera five kingdoms of living organisms biodiversity and need of classification

All monerans ___________________.

  1. Contain $DNA$ and $RNA$
  2. Demonstrate a long circular strand of $DNA$, not formed enclosed in a nuclear membrane

  3. Are bacteria

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Monerans are prokaryotes, meaning they lack a membrane-bound nucleus (they have a nucleoid with circular DNA). They are not exclusively bacteria (they include archaea), but the options provided are often grouped in general biology contexts.

Multiple choice biology biodiversity and classification monera five kingdoms of living organisms biodiversity and need of classification

Choose the correct answers from the alternatives given.
In Whittaker system of classification, all prokaryotes were included In the kingdom:

  1. Monera

  2. Protista

  3. Fungi

  4. Mychota
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the five-kingdom classification system proposed by R.H. Whittaker, all prokaryotic organisms are grouped into the kingdom Monera.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Temperature of the scrotum which is necessary for the functioning of testis is always around __________ below body temperature.

  1. $2^oC$
  2. $4^oC$
  3. $6^oC$
  4. $8^oC$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Scrotal temperature is about 2$^oC$' lower than the rest of the body. This temperature required for the process of sperm development, or spermatogenesis, (the process by which haploid spermatozoa develop from germ cells in the seminiferous tubules of the testis.) to proceed normally. 
So, the correct answer is '2$^oC$'. 
Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Which, of the following is correct about mammalian testes?

  1. Graafian follicles, Sertoli cells, Leydig's cells

  2. Graafian follicles, Sertoli tells, Seminiferous tubules

  3. Sertoli celts. Seminiferous tubules, Leydig's cells

  4. Graafian follicle, Leydig's cells, Seminiferous tubule
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mammalian testes contain seminiferous tubules (where sperm are produced), Sertoli cells (nourishment), and Leydig cells (testosterone production). Graafian follicles are found in ovaries, not testes.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

The head of the epididymis at the head of the testis is called ____________.

  1. Cauda epididymis

  2. Vas deferens

  3. Caput epididymis

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

The epididymis is a mass of long narrow closely coiled tubule which lies along the inner side of each testis. Coiling forms three parts - 

Upper - caput epididymis or head, 
Middle - corpus epididymis or body, and 
Lower - cauda epididymis or tail.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

The immature male germ cell undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.

  1. Spermatogonia have 46 chromosomes and always undergo meiotic cell division.

  2. Primary spermatocytes divide by mitotic cell division.

  3. Secondary spermatocytes have 23 chromosomes and undergo second meiotic division.

  4. Spermatozoa are transformed into spermatids.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Spermatogonia are diploid cells on the inside wall of seminiferous tubules that multiply by mitotic divisions. Some of the spermatogonia called primary spermatocyte undergo meiosis-I to give rise to secondary spermatocytes (haploid). Each secondary spermatocyte undergoes melosis-II to give rise to two haploid spermatids which are transferred to spermatozoa by spermiogenesis.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

If for some reason, the vasa efferentia in the human reproductive system get blocked, the gametes will not be transported from _______.

  1. Testes to Epididymis

  2. Epididymis to Vas deferens

  3. Ovary to Uterus

  4. Vagina to Uterus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vasa efferentia are fine ciliated ductules that arise from the seminiferous tubules of testis (where sperms are formed) and open into epididymis which is a mass of long narrow closely coiled tubule lying along the inner side of testis. Epididymis stores the sperms. Thus, if vasa efferentia get blocked, sperms will not be transposed from testes to epididymis.

Multiple choice biology reproduction in plants and animals menstruation male reproductive system in humans male reproductive system the reproductive system

Which of the following organs releases sperm?

  1. Vas deferens

  2. Testes

  3. Scrotum

  4. Urethra
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Testes are the pair of oval organs, about the size of large olives that lie in the scrotum. The testes are responsible for making testosterone which is the primary male sex hormone, and for generating sperm. 

Therefore, the correct answer is option B.

Multiple choice biology reproduction in plants and animals menstruation male reproductive system in humans male reproductive system the reproductive system

Primary sex organ of a human male is 

  1. Testes

  2. Vas deferens

  3. Seminal vesicle

  4. Penis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The primary reproductive organ of human male is testes, it produces male hormones  testosterone and sperm.

The male reproductive organ includes external penis,scrotum and genitals, where as the internal organ includes vas differentia, prostate gland , urethra and seminal vesicles.
The pair of testes are also known as male gonads. Epididymis is the cap formed by 20 foot long coils presesnt  on each testes. Vas deferens is a thick walled tube which helps in the transport of sperms to epididymes to the prostate gland.
So, the correct option is 'Testes'.