Skip to main content

Batrachospermum :Origin ,strucutre ,Thallus organisation and reproduction

By
                                              Batrachospermum Occurrence:-   (1) Batrachospermum is fresh water alga.    (2) It is found in clear, cool, and running streams.   (3) Deepwater plants are dark violet or reddish in color. But the shallow-water species are olive green.   (4) The intensity of light changes the color of pigments.   (5) The thallus is attached to the substratum. Vegetative structure  (1) The thallus of an adult plant is soft, thick, filamentous.  (2) It is freely branched and gelatinous.   (3) The central axis is made up of a single row of large cells. Whorls of branches of limited growth        are developed on this axis.  (4) These branches are filamentous and dichotomously arranged.  (5) The main axis is corticated. It consists of a row of elongated cylindrical cells.   (6) It is differentiated into nodes and internodes.   (7) There are two types of branches that arise from the nodes:       Branches of limited growth        Branches of unlimited growth Batra
Post a Comment

Question on Algae -Characterstics ,thallus and reproductive system

By

                                             
 Questions on Algae    
                  


Q.1. Agar-Agar is obtained from  ?

A. Gelidium

B. Polysiphonia

C. Fucus

D. Lamineria

Ans: A

Q.2. Plants are which is not differentiated into root, stem and leaf are in under ?

A. Pteridophytes

B. Gymnosperms

C. Thallophyta

D. Angiosperms

Ans: C

Q.3. Which are the most primitive group  of  algae is ?

A. BGA

B. Green algae

C. Yellow Algae

D. Red Algae

Ans: A

Q.4. Iodine is obtained from?

A lamineria

B. Ulothrix

C. Spirogyra

D. gelidium

Ans: A

Q.5. Which of the following is advanced group of algae?

A. Cyanophyaecae

B. Rhodophyaecae

C. Chlorophyaecae

D. Phaeophyaecae

Ans : B

Q.6. Which algae is responsible for red-sea ?

A. Trichoderma erytherium

B. chlymdomonas

C. Ulothrix

D. None of these

Ans: A

Q.7. One of the following is present in BGA?
A. Starch

B. Cyanophyacean  granules

C. Any polysaccharides

D. Floridian starch

Ans : B

Q.8. Ability to fix atmospheric nitrogen in ?

A. Leaves of some crops plants

B. Chlorella

C. Some marine Red Algae

D. Some BGA

Ans: D

Q.9. Algae is differ from Riccia and Marchantia ?

A .Multicelluar Body

B. Multicellular sex organ

C. Thalloid Body

D. Pyrenoids in the cell

Ans : C

Q.10. Cephaleoures is ?

A. An epiphytic green algae

B. A parasitic green algae

C. A fresh water Green algae

D. A colourless green algae

Ans : B



Labels:

Comments

Post a Comment

Thanks

Popular posts from this blog

Batrachospermum :Origin ,strucutre ,Thallus organisation and reproduction

By
                                              Batrachospermum Occurrence:-   (1) Batrachospermum is fresh water alga.    (2) It is found in clear, cool, and running streams.   (3) Deepwater plants are dark violet or reddish in color. But the shallow-water species are olive green.   (4) The intensity of light changes the color of pigments.   (5) The thallus is attached to the substratum. Vegetative structure  (1) The thallus of an adult plant is soft, thick, filamentous.  (2) It is freely branched and gelatinous.   (3) The central axis is made up of a single row of large cells. Whorls of branches of limited growth        are developed on this axis.  (4) These branches are filamentous and dichotomously arranged.  (5) The main axis is corticated. It consists of a row of elongated cylindrical cells.   (6) It is differentiated into nodes and internodes.   (7) There are two types of branches that arise from the nodes:       Branches of limited growth        Branches of unlimited growth Batra
Post a Comment
Read more

Biological Classification of Phylum Porifera and Ctenophora

By
                               Kingdom Animalia Phylum Porifera  :- The name of this phylum is due to presence of pores on the surface of this members. Ostia and osculum . (a) Sycon                                (b) Euspongia Characters of this phyla :- (1)            Cellular level of organization(new body is formed by the help of cell ) (2)            Acoelomate (coelomic cavity absent ) (3)            Water Canal  system is present. (4)            They are mainly marine but some members lives in fresh water (Euspongia). (5)            Diploblastic (Presence of only two germ layers). (6)            Their body is supported by skeleton called spicules which are made up of Calcium carbonate, Silica or Spongyn fibre. (7)            Digestion is intacellular. (8)            Asexual reproduction is by internal and external budding or gemmule formation . (9)            Development is indirect and  by the amphiblastula larva. (10)           Exc
Post a Comment
Read more

Human Reproductin Class 12th Notes-Male Reproductive Part

By
                               Human Reproduction The Male Reproductive Part:-                                                 It includes a pair of the testis, glands, and external genitalia. 1. The testis is present outside the abdominal cavity within a pouch-like structure called Scrotum. 2. The scrotum helps in maintaining its temperature - 2C lower than normal body temperature, because it is necessary for spermatogenesis. 3. Each testis has 250 compartments called testicular lobules. 4. Each testicular lobules contain 2-3 seminiferous tubules 5. Seminiferous tubules contain Male germ cells(Spermatogonia) and steroli cells, Male germ cells meiotically divide and form sperms. 6. Leydig's cells provide nourishment to the sperms and secrets of the Androgens hormone. 7. Male sex accessory includes Rete testis, vasa efferentia, epididymis, and vasa deferentia. Sperm release Pathway    The male accessory glands include paired  seminal vesicles , prostat
Post a Comment
Read more