Tag: biology

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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 the correct combination?

  1. Haemoglobin - Muscle contraction

  2. Sertoli cells - Sperm nutrition

  3. Rods and cones - Auditory reception

  4. Cochlea - Eye
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

sertoli cells or nurse cells which helps nourishing sperms and spermatogenesis.

So the correct answer is 'Sertoli cells - Sperm nutrition.'

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

Sertoli cells are involved in

  1. Excretion

  2. Respiration

  3. Nutrition and morphogenesis of sperms

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

Sertoli cells or nurse cells which are a part of seminiferous tubules helps in process of spermatogenesis or production of sperms, nutrition, and morphogenesis of sperms.

So the correct option is 'Nutrition and morphogenesis of sperms.'

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

The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is :

  1. Spermatogonia-spermatid-spermatocyte- sperms

  2. Spermatocyte-spermatogonia-spermatid- sperms

  3. Spermatogonia-spermatocyte-spermatid- sperms

  4. Spermatid-spermatocyte-spermatogonia- sperms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Spermatogenesis begins with spermatogonia (diploid stem cells), which divide to form primary spermatocytes. These undergo meiosis to become spermatids, which then differentiate into mature spermatozoa (sperms).

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

Which among the following is not the function of testes at puberty?
(i) Formation of germ cells
(ii) Secretion of testosterone
(iii) Development of placenta
(iv) Secretion of estrogen

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (iii) and (iv)

  4. (i) and (iv)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gonads have a dual function, production of hormones and gametes. In the male, testes produce sperms and testosterone. 

Placenta develops in females during pregnancy. It has a number of functions, like the production of hormones, nutrition, excretion etc. Estrogen is a female hormone produced by the ovaries (female gonads). Thus, the correct answer is option C.

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

Which gland is responsible for the secondary sexual characters in boys?

  1. Ovary

  2. Pancreas

  3. Adrenal gland

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

Testes are the primary reproductive organs which produce sperms and hormone known as testosterone. This hormone is important for sexual development and puberty i.e., development of secondary sexual characteristics like facial hair, sexual behaviour etc.
The ovary is the female reproductive organ which produces the mature ovum which further fuses with sperm to form a zygote. 
Pancreas is a heterocrine gland which secretes insulin, glucagon and somatostatin as endocrine and pancreatic juice an exocrine gland.
Adrenal are endocrine glands, which secretes various cortisol.
Thus, the correct answer is option D.

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

Which of the following organ is involved in production of sperm?

  1. Ovary

  2. Testis

  3. Vagina

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The testes are a pair of primary male reproductive organ. The testes are responsible for the production of sperm cells and the male sex hormone, testosterone.
Thus, the correct answer is option A.

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

Which of the following age is the limit for sperm production in males?

  1. 30-35 years

  2. 40-45 years

  3. 45-50 years

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As and when the body ages, both male and female experience changes in their body gradually. These changes are not only in ageing but also in their reproductive systems. Females, start producing eggs (female gamete) once they start menstruating at the age of 12-15 and seizes to produce at the age of around 40. This phase is called menopause in females. In contrast, there is no such thing as andropause in males reported by WHO. Production of sperms may reduce or halt in a man due to the reduced secretion of testosterone or decrease in Leydig cells. But a healthy man will continue in sperm production throughout his lifetime. So, the correct answer is option D.

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

Human males produce which of the following hormones?

  1. Testosterone

  2. Luteinizing hormone

  3. Follicle stimulating hormone

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

Important male reproductive hormones are FSH, LH, and testosterone.

FSH is important for the production of sperm. 
LH stimulates testosterone production.
Testosterone is produced by cells of Leydig and important for the development of male secondary sexual characteristics, spermatogenesis. 
So, the correct answer is option D.

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

State the following statement is true or false.

Spermatozoa get nutrition from Sertoli cells.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sertoli cells are supportive, nutritive cells that secrete a polypeptide hormone which is known as inhibin.

These are found in the testis of males which help in providing nutrition to the growing spermatozoa, therefore, they are also known as nurse cells.
The spermatozoa, once they are divided from the sperm mother cell, remain embedded in the Sertoli cells by their heads to get nutrition.
So, the correct option is 'True'.