Question

Describe the morphology of thallus, vegetative and sexual reproduction in Fucus with the

help of clear and well labelled diagrams.
​

Answer 1

Answer:

The method of sexual reproduction is heterogamous. The gametes are borne in oogonia and antheridia, which are produced in the conceptacles. In some species each conceptacle contains both oogonia and antheridia, in others there are distinct male and female conceptacles borne on two different thalli.

Answer 2

Life Cycle of Fucus

Explanation:

Thallus body of fucus

• The Thallus is enduring with an unpredictable or circle molded holdfast or with haptera
• The erect part of the thallus is subpinnately stretched OR dichotomous  smoothed and with a particular midrib
• Gas-filled pneumatocysts (air-vesicles) are available two by two in certain species, one on either side of the midrib

Vegetative Collection of Fucus

• The thallus, which is a sporophyte, shows the best com­plexity of structure with an outside separation tantamount to that of a vascular plant
• It has a circle like holdfast from which emerges a stem-like stipe that bears a wide leaf-like straightened partition, the frond
• The plant overall is around 35-70 centimeter long, and the verdant bit of the thallus shows ordinary dichotomous stretching
• The thalli of certain types of Fucus (for example F. vesiculosus) contain, a little behind the apices of the branches, air-bladders  

Sexual Reproduction in Fucus  

• Fucus vesiculosus, is heterothal­lic
• The antheridia, toward the start, are ovoid cells
• Each of these ovoid cells, which are bound to form into an antheridium, is uninucleate, and this core partitions and re-isolates until 64 cores are delivered
• The Fucus plant, when presented to air during low tide, experiences shrinkage, and accordingly, the mass of gametes, inserted in the adhesive, is expelled through the ostiole
• At elevated tide these are washed off and the an­therozoids are liberated for preparation  
• The Oogonia are additionally created among the paraphyses inside the oogonia or blended conceptacles
• During the advancement of an oogonium, a short outgrowth creates from the layer of cells for­ming the mass of the conceptacle  
• The treatment of the eggs outside the body of the plant is made conceivable by reason of the incredible number and motility of the antherozoids, just as, because of the trademark smell of a subs­tance discharged by the egg by which the antherozoids are pulled in Each prepared egg at that point secretes a flimsy cellulose divider around it framing a zygote, and this doesn't turn into a resting spore
• It before long develops and develops into another plant