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Asked by Surya rao Sripathi

Jan 31, 2014

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 fun...

Answer (2)

Asked by Adithyan Sanal

May 6, 2015

Why are some seeds referred to as apomictic seeds? Mention one advantage and one disadvantage to a farmer who uses them.

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Answer (2)

Asked by Johhhn Cena

Sep 30, 2015

Question:
(a) How does the pollination in Vallisneria and Sea grasses takes place?

(b) What type of floral reward is provided by the Yucca plant to the species of moth

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...

Answer (1)

Asked by Sanalkumar S

Apr 25, 2015

Give reasons for the following:
(a) The human testes are located outside the abdominal cavity.
(b) Some organisms like honey bees are called 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.<...

Answer (2)

Asked by Adithyan Sanal

May 6, 2015

What do you mean by p2+2pq+q2 = 1 stand for? 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 ...

Answer (2)

Asked by Surya rao Sripathi

Jan 31, 2014

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 semini...

Answer (1)

Asked by Ethesh

May 15, 2014

At what stage the mammalian embryo implanted in the uterus?

Answer.

    At blastocyst stage mamalian embryo is implanted in the uterus.       

Answer (2)

Asked by Shakti Gayatri

Aug 10, 2014

What is the difference between morula and a 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 fertilisatio...

Answer (1)

Asked by Ethesh

May 15, 2014

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...

Answer (1)

Asked by Sanalkumar S

Jul 7, 2015

give a well labelled diagram of a female ovum

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