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Syeda answered 1 year(s) , 7 month(s) ago

What is microsporangium? Where it is located? Show a labelled diagram.

Sol:

Microsporangium is the sporangial structure which contains microspores which are the pollen sacs giving rise to male gametes in an angiosperm.
T.S of anther shows the four lobes for...

Asked by Sagar

Jan 25

  • 2 Answers
  • 0 Like
  • 14014 Views
Syeda answered 1 year(s) , 8 month(s) ago

What is microsporogenesis? Where does it occur in angiosperms?

why do we need sex?

Asked by Sai

May 14

  • 11 Answers
  • 3 Likes
  • 9212 Views
Syeda answered 1 year(s) , 8 month(s) ago

Why the pollengrains well preserved as fossils?

Answer.

    Pollen grains has a prominent two-layered wall. The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material known. It can wi...

Asked by Sai

May 13

  • 2 Answers
  • 0 Like
  • 7282 Views
Syeda answered 1 year(s) , 7 month(s) ago

A liverwort plant is unable to complete its life cycle in a dry environment. State two reasons.

Answer,

liverworts belongs to bryophytes
*Liverworts live in damp and marshy areas on land. The y cannot survive in dry regions.
*Liverworts require water to complete their life...

Asked by Adithyan

May 6

  • 2 Answers
  • 0 Like
  • 6531 Views
Syeda answered 1 year(s) , 7 month(s) ago

What is the significance of apomixis? How can it be commercially used?

Answer.

Apomixis is the method involved in production of seeds without fertilisation.Apomixis has an advantage of producing inividuals with desired qualities in more numbers.

Apo...

Asked by Adithyan

May 6

  • 3 Answers
  • 0 Like
  • 6347 Views
Aruna kavitha answered 3 year(s) ago

Explain how pollen grains are formed from sporogenous tissue.

Sol:

Microsporangium is the sporangial structure which contains microspores which are the pollen sacs giving rise to male gametes in an angiosperm.
T.S of anther shows the four lobes for...

Asked by Sagar

Feb 2

  • 1 Answer
  • 1 Like
  • 5382 Views
Syeda answered 1 year(s) , 7 month(s) ago

Why is endosperm in angiosperms is triploid while zygote formed is diploid?

Answer.

The process of fertilisation observed in angiosperms is called as double fertilisation. It is the combination of syngamy and triple fusion. Events during fertilisation are elucidated. <...

Asked by Sanalkumar

Jun 17

  • 2 Answers
  • 0 Like
  • 5017 Views
Agam answered 1 year(s) , 3 month(s) ago

Bring out the differences between dicot embryo and a monocot embryo.

DICOT EMBRYO MONOCOT EMBRYO Dicot embryo is enclosed in between two cotyledons. Monocot embryo is enclosed by a single cotyledon. Dicot embryo has its plumule, future shoot in distal position. Monocot emb...

Asked by Sunny

Apr 17

  • 2 Answers
  • 0 Like
  • 4542 Views
Syeda answered 1 year(s) , 8 month(s) ago

What is triple fusion? Where and how does it take place?

Answer.
    Triple fusion refers to the process by which male nucleus fuses with the two polar nulei. It takes place inside the embryo sac of an angiosperm. 

Asked by Sai

May 14

  • 2 Answers
  • 0 Like
  • 4009 Views
Aruna kavitha answered 3 year(s) , 7 month(s) ago

What are bisexual plants? Name some of them.

Sol:
Flowers based on the reproductive whorls they carry, can be classified into unisexual flowers and bisexual flowers. 
A bisexual flower is the flower which consists both the whorls of stamen...

Asked by Ujjval

Jun 7

  • 1 Answer
  • 1 Like
  • 3707 Views
Aruna kavitha answered 3 year(s) , 9 month(s) ago

Why are the offspring raised through micropropagation called as somaclones? What are the advantages of this technique?

Sol:
a) The sample which is used for micropropagation can be from any part of the plant other than reproductive cells. Hence, the offspring are termed to be somaclones....

Asked by Sanalkumar

Apr 13

  • 1 Answer
  • 1 Like
  • 2889 Views
Dr k kesava answered 4 year(s) , 8 month(s) ago

What is monocarpellary pistil?

Carpel is one of the individual female reproductive organs in a flower. A carpel is composed of an ovary, a style, and a stigma. In origin, carpels are leaves or megasporophylls that have evolved to enclose the...

Asked by Sai

May 13

  • 1 Answer
  • 0 Like
  • 2882 Views
Aruna kavitha answered 3 year(s) , 11 month(s) ago

What is the nature of ploidy of a central cell belonging to a mature female gametophyte?

Sol:
Central cell is diploid in nature.

*Ploidy is the number of sets of chromosomes in a biological cell. Haploid number is the number of chromosomes in a gamete. Dipl...

  • 1 Answer
  • 0 Like
  • 2876 Views
Syeda answered 1 year(s) , 7 month(s) ago

Why do moss plants produce very large number of male gametes? What are these gametes called?

Answer.


Bryophytes and pteridophytes require water as a medium for reproduction. Egg or the female gametophyte remains intact within the mother plant.Male gametes have to be released int...

Asked by Sanalkumar

Apr 13

  • 2 Answers
  • 0 Like
  • 2840 Views
Aruna kavitha answered 3 year(s) , 11 month(s) ago

What is the number of haploid cells present in a mature female gametophyte of an angiosperm.

Sol:

There are seven haploid cells in the female gametophyte. They include three antipodal cells, one central cell, two synergid cells and one egg cell. The female gametophyte is also called as...

  • 2 Answers
  • 0 Like
  • 2520 Views
Aruna kavitha answered 3 year(s) ago

How many nuclei are present in polygonum embryo sac?

Sol:

Based on the number of megaspores involved in the development of embryo sac, the number of divisions underwent by nucleus and the organisation of nuclei in mature embryo sac , embryo sacs a...

Asked by Sanjay

Feb 5

  • 1 Answer
  • 0 Like
  • 2458 Views
Adithyan commented 3 year(s) , 9 month(s) ago

What are roles of mRNA, tRNA and ribosomes in the process of translation?

Sol: DNA, mRNA, rRNA, tRNA and ribosomes play an important role in the process of protein synthesis. The sites of protein synthesis are ribosomes. The process of protein synthesis is divided into two steps name...

Asked by Adithyan

May 3

  • 1 Answer
  • 0 Like
  • 2298 Views
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