Inflorescence - Racemose Inflorescence - Cymose Inflorescence & Alternation of Generation

It is the mode of branching of floral axis having a group of flowers. There are two types of inflorescence.Racemose Inflorescence:     It is indefinite inflorescence. In Racemose, man axis called peduncle continues to grow. The flower develops in acropetal in acropeta succession. It means the old flowers are at the base while young flowers are at the tip of floral axis. The opening is centripetal.Peduncle Elongated: Racemose : It is an inflorescence in which flowers are pedicellated and bisexual. e.g. Brasica.Spike: It is...

Read More

Short Notes on Structure of Mature Seed

Structure of Mature Seed:      After double fertilization ovule develops into seeds. During the last stages of seed maturation the water is lost by dehydration. The mature seed contain 5% to 15% water by weight. The embryo stops growing and developing until the seed germinates. Embryo is surrounded by cotyledons (Seed leaf) or endosperm or by both.      Both endosperm and embryo are enclosed in seed coat, which is formed by ovule integument. If a seed has single cotyledon it is known as monocot. The embryo is...

Read More

Salient Feature In The Life Cycle Of Gymnosperm

These plants that produce necked seed are called gymnosperm. The fruit is not formed because ovary is absent.The main plant is diploid and a sporophytes.The plants produce two different types of spores micro spore and mega spore, this condition is called heterospory.The functional mega spores develop to form a reduced female gametophytes, which remains within mega sporangium.Female gametophytes consists of two to five archegonia each having single ovum.Each micro spore develops to form a reduced male gametophytes, which consists of stalk nucleus,...

Read More

What is Pollination & Role of Pollen Tube

The transfer of pollen grains from anther to stigma of a flower is called pollination. Pollination is two types.Self PollinationCross PollinationSelf Pollination: Transfer of pollen grain from anther to stigma of same flower is known as self-pollination. In this type only single flower is involved. Deocious plants cannot self-pollinate because they are uni sexual, being either staminate or carpel late.Cross Pollination: Transfer of pollen grain from the anther to stigma of another flower of same species. Cross-pollination takes...

Read More

Reproduction In Plants

(a) Asexual Reproduction: The formation of new individual from single parent without production of gametes is called asexual reproduction in plants the natural methods of reproduction are by spores, vegetables propagation and by Apomixis.By Spores or Sporulation: Spores are asexual haploid cells formed by meiosis in plants the process of spores formation is called sporulation. In plants spores are formed during alternation of generation. In this process two generations saprophytes and gametophytes alternate with each other saprophytes...

Read More

Plants Hormones - Biology

Plants produce different kinds of chemical substances, which increase the growth and development these chemicals are called plant hormone.    They effect the gene expression, activities or inhibit enzymes and changes the properties of membrane. These are in very less concentration.     There are five kinds of plants hormones.Auxins: Auxin is class of chemicals, which are both natural and synthetic. The most important natural auxin in Acetic Acid (l.A.A), which is found in higher plants. It is synthesised at tips...

Read More

Rupert of Hentzall - Character of The Novel ( The Prisoner of Zenda )

Rupert of HentzallIntroduction:    Rupert of Henzall is an important character of the novel. He is one of the six hirelings of the Duke-Michael. He is the most ferocious, reckless and dangerous of them all. He is a rider and an expert swordsman.Physical Appearance:     Rupert is a young man of about twenty five years old. He is very handsome person.A Very Talkative Fellow:      Rupert is a man of very sharp tongue. He knows well how to hurt the feelings of others by his talk. He humiliates...

Read More