Conifers differ from grasses in the from Biology Sexual Reproduction in flowering Plants Class 12 Nagaland Board
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Sexual Reproduction in flowering Plants

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Conifers differ from grasses in the

  • production of seeds from ovules

  • lack of xylem tracheids

  • absence of pollen tube

  • formation of endosperm before fertilization


D.

formation of endosperm before fertilization

The conifers (gymnosperm) differ from the endosperm before fertilization. In fact, in gymnosperms,  the endosperm is formed before the fertilization, thus, it is a haploid tissue while in angiosperms, endosperm is formed after fertilization as a result of triple fusion or double fertilization, thus, it is a triploid tissue.
In both conifers and grasses seeds are produced from ovules.
Xlem tracheids are present in both conifers and grasses.
Pollen tubes are also formed in both conifers and grasses.


The conifers (gymnosperm) differ from the endosperm before fertilization. In fact, in gymnosperms,  the endosperm is formed before the fertilization, thus, it is a haploid tissue while in angiosperms, endosperm is formed after fertilization as a result of triple fusion or double fertilization, thus, it is a triploid tissue.
In both conifers and grasses seeds are produced from ovules.
Xlem tracheids are present in both conifers and grasses.
Pollen tubes are also formed in both conifers and grasses.


624 Views

Simultaneous meiotic division of microspore mother cells leads to :
  • tetrahedral tetrad
  • linear tetrad
  •  isobilateral
  • decussate tetrad.

A.

tetrahedral tetrad
1487 Views

The fertilization occurs in the :
  • ovary
  • ovule
  • embryo sac
  • nucellus.

A.

ovary
1446 Views

The female gametophyte of a typical dicot at the time of fertilization is:
  •  8-celled
  • 7-celled
  • 6-celled
  • 4-celled

B.

7-celled
2359 Views

In a bisexual flower when the gynaecium matures earlier than anther, it is called as :
  • protandry
  • protogyny
  • herkogyny
  • None of the above.

B.

protogyny
1265 Views

The innermost layer of anther is tapetum whose function is :
  • dehiscence
  • mechanical
  • nutrition
  •  protection.

C.

nutrition
1827 Views