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Question & Answer Forum

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Syeda answered 1 year(s) , 10 month(s) ago

What is the function of tail in sperm?

Answer.

The sperm cell has a long tail like flagella. The tail is made of protein fibres which contract on alternative sides, giving it a wavelike movement (snake-like motion).  The main functio...

Asked by Surya rao

Jan 31

  • 2 Answers
  • 2 Likes
  • 18527 Views
Syeda answered 1 year(s) , 10 month(s) ago

Wha are apomictic seeds? Mention one advantage and one disadvantage.

Answer.

Apomixis is the asexual production of seeds.

Advantage of apomixis is that it would drastically reduce the cost of hybrid production, so that plant breeders produce new v...

Asked by Adithyan

May 6

  • 2 Answers
  • 0 Like
  • 13200 Views
Anisha answered 3 year(s) ago

How does the pollination takes place in Vallisneria and Sea grasses?

Ans: In Vallisneria pollination is through hdrophilly ie through water. In Valilisneria, the female flower appear on the surface of the water as it have a long stalk. The pollen grains released by the male flow...

Asked by Johhhn

Sep 30

  • 1 Answer
  • 1 Like
  • 10059 Views
Syeda answered 1 year(s) , 10 month(s) ago

Why are human testes located outside the abdominal cavity? Why are some animals like honey bees called as parthenogenetic animals?

Answer.

A pair of testis is placed in a structure called as scrotum which is located outside the abdominal cavity. Scrotum which distends below from abdominal region to maintain low temperature....

Asked by Sanalkumar

Apr 25

  • 2 Answers
  • 1 Like
  • 9409 Views
Aruna kavitha answered 3 year(s) , 9 month(s) ago

What does the following equation p2 + 2pq + q2 = 1 represent? Explain.

Sol:

p2+2pq+q2 is the Hardy-Weinberg equation which is used to determine or predict the relative frequency of different alleles even if there is population growth. 
Here p2 represent the...

Asked by Adithyan

May 6

  • 2 Answers
  • 1 Like
  • 5474 Views
Surya rao answered 5 year(s) , 2 month(s) ago

Q: What are two major functions of testis and ovary?

Functions of testis:

  1. Male gametes called spermatozoa are produced by the testis through the process of spermatogenesis.
  2. The leydig cells of the seminiferous tubules of testis produces mal
...

Asked by Surya rao

Jan 31

  • 1 Answer
  • 0 Like
  • 3165 Views
Syeda answered 1 year(s) , 10 month(s) ago

At what stage the mammalian embryo implanted in the uterus?

Answer.

    At blastocyst stage mamalian embryo is implanted in the uterus.       

Asked by Ethesh

May 15

  • 2 Answers
  • 0 Like
  • 2874 Views
Dr k kesava answered 4 year(s) , 11 month(s) ago

Why is cleavage in a mammalian zygote referred to as holoblastic?

The phase of embryogenesis consisting of rapid cell divisions following fertilization is called cleavage. The mitotic divisions during this phase are called cleavage divisions are resulting daughter cells are k...

Asked by Ethesh

May 15

  • 1 Answer
  • 0 Like
  • 2352 Views
Aruna kavitha answered 4 year(s) , 8 month(s) ago

Morula and Blastocyst

Sol:
Fertilisation is the fusion of male and female gametes to give rise to a single cell – zygote. Zygote, the super cell marks the beginning of a new individual. After 3 to 4 days of fertilisation, by...

Asked by Shakti

Aug 10

  • 1 Answer
  • 0 Like
  • 2184 Views
Aruna kavitha answered 3 year(s) ago

What do you mean by uterus masculinus?

Sol:
Uterus masculinius is also called as prostrate utricle is found in the urinogenital system of certain vertebrates. It develops from the lower part of the mullerian duct of mammals. It is a small bi...

  • 1 Answer
  • 0 Like
  • 1623 Views
Srini answered 3 year(s) , 8 month(s) ago

How did an American company, Eli Lilly use the knowledge of r-DNA technology to produce human insulin?

Use with recombinant DNA Technology the gene responsible for insulin production of human is inserted in to E.coli bacteria and this e coli bacteria is developed in much quantity on the culture medium in the lab...

Asked by Adithyan

May 6

  • 1 Answer
  • 0 Like
  • 1385 Views
Dr k kesava answered 4 year(s) , 11 month(s) ago

What is Colostrum? Why is it important to be given to the new born infants?

Colostrum is the yellowish fluid produced from the mother's mammary glands during the initial days
of lactation. It contains abundant antibodies that insures the health and vitality of the newborn. ...

Asked by Ethesh

May 15

  • 1 Answer
  • 0 Like
  • 1195 Views
Meghna answered 1 year(s) , 6 month(s) ago

(a) List the different attributes that a population has and not an individual organism. (b) What is population density? Explain any three d..

Attributes of a population are:
i. Population density
ii. Natality or birth rate
iii. Mortality or death rate
iv. Population growth
v. Sex ratio
vi. Age distribut...

Asked by Adithyan

May 6

  • 2 Answers
  • 1 Like
  • 998 Views
Dr k kesava answered 4 year(s) , 10 month(s) ago

Why is cleavage in a mammalian zygote referred to as holoblastic?

The cleavage in mammals referred as simple holoblastic because cleavage divisions divide the egg completely.

Asked by Sai

May 15

  • 1 Answer
  • 0 Like
  • 909 Views
Dr k kesava answered 4 year(s) , 11 month(s) ago

What is mesovarium?

Mesorvarium is the peritoneal membrane by which the ovaries are suspended from the wall of pelvic cavity.

Asked by Sai

May 15

  • 1 Answer
  • 0 Like
  • 774 Views
Dr k kesava answered 4 year(s) , 11 month(s) ago

Which hormone is detected in the urine of pregnant female?

The hCG hormone, also called the pregnancy hormone, is produced in the placenta of a pregnant woman. This hormone can usually be detected in the urine about 10 days after first missed period of the conceived wo...

Asked by Ethesh

May 15

  • 1 Answer
  • 0 Like
  • 757 Views
Surya rao answered 5 year(s) , 2 month(s) ago

What is the function of tail in sperm?

A sperm cell is the male reproductive cell and a mature human sperm cell has snake like structure. A male sperm cell comprises the following parts - head, neck, middle piece and tail.
The head carries t...

Asked by Surya rao

Jan 31

  • 1 Answer
  • 0 Like
  • 735 Views
Aruna kavitha answered 4 year(s) , 7 month(s) ago

Endocrine Gland responsible for sex

Sol:

Hypothalamus is the gland which works actively by producing oxytocin responsible for sexual intimacy. Gonadosteroids produced by gonads are also responsible for the activity.

Asked by Rajat

Aug 21

  • 1 Answer
  • 0 Like
  • 732 Views
Aruna kavitha answered 4 year(s) , 3 month(s) ago

What is Sexual Intercourse?

Sol:
I remember you asking the same question. But anyway the answer is here.

Sexual intercourse is an act in which a male reproductive organ enters the female reproductive tract to discharge

...

Asked by Sneha

Dec 14

  • 1 Answer
  • 2 Likes
  • 728 Views
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