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Is retrogressive metamorphosis is shown only by Urochordates... or any other class performs.....
@Vasudevan.G  Retrogressive Metamorphosis is shown by Urochordates and Herdmania.

Select the correctly written scitific name of Mango which was first described by Carolus Linnaeus :

  • Option 1)

    Mangifera indica Car. Linn.

  • Option 2)

    Mangifera indica Linn.

  • Option 3)

    Magniferra indica

  • Option 4)

    Magnifera Indica

Mangifera indica Linn

 

 

Which of the following statements is incorrect ?

  • Option 1)

    Morels and truffles are edible delicacies.

  • Option 2)

    Claviceps is a source of many alkaloids and LSD.

  • Option 3)

    Conidia are produced exogenously and ascospores endogenously.

  • Option 4)

    Yeasts have filamentous bodies with long thread-like hyphase.

  Ascomycetes / Sac fungi - Mycelium is septate and branched. Sexual reproduction is Isogamy or anisogamy. Four to eight ascospores are formed in an ascus. Fruiting body is Ascocarp. Centrum is present. - wherein Eg. Saccharomyces, cerevisiae, Baker's yeast, Penicillium.       Yeasts are unicellular fungi. They sometimes form pseudophypha by continuous budding, they are not...

Which of the following statements is incorrect ?

  • Option 1)

    Viroids lack a protein coat.

     

  • Option 2)

    Viruses are obligate parasites.

  • Option 3)

    Infective constitiuent in viruses is the protein coat.

  • Option 4)

    Prions consist of abnormally folded proteins.

  Viruses - Nucleoprotein entity which require living host to replicate themselves utilising its synthetic machinery. -     Viruses are made up of protein coat and genetic material. The genetic material is inserted into the host for multiplication and growth of viruses. Hence, genetic material is the infectious constituent.Option 1)Viroids lack a protein coat.  Option 2)Viruses are obligate...

From evolutionary point of view, retention of thje female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in :

  • Option 1)

    Liverworts

  • Option 2)

    Mosses

  • Option 3)

    Pteridophytes

  • Option 4)

    Gymnosperms

  Reproduction of Pteridophyta - Asexual by meiospores formed inside sporangia which is associated with sporophylls (sporophytes). Gamatophytes develop from spores  and are haploid and independent and reproduce sexually. Zygote, thus produced from diploid sporophyte. - wherein Two other ways of reproduction include: Apogamy and Apospory.       Rentention of the female gametophyte with...

Match the following organisms with their respective characteristics:

(a)  Pila                                  (i)   Flame cells

(b)  Bombyx                           (ii)   Comb plates

(c)  Pleurobrachia                  (iii)   Radula

(d)  Taenia                              (iv)  Malpighian

                                                         tubules

Select the correct option from the following :

 

  • Option 1)

    (a)\; \; \; \; \; (b)\; \; \; \; \; (c)\; \; \;\ (d)

    (iii)\; \; \; \; (ii)\; \; \; \; (i)\; \; \;\; (iv)

     

     

     

     

  • Option 2)

    (a)\; \; \; \; \; (b)\; \; \; \; \; (c)\; \; \;\ (d)

    (iii)\; \; \; \; \; (iv)\; \; \; \; \; (ii)\; \; \;\ (i)

  • Option 3)

    (a)\; \; \; \; \; (b)\; \; \; \; \; (c)\; \; \;\ (d)

    (ii)\; \; \; \; \; (iv)\; \; \; \; \; (iii)\; \; \;\ (i)

  • Option 4)

    (a)\; \; \; \; \; (b)\; \; \; \; \; (c)\; \; \;\ (d)

    (iii)\; \; \; \; \; (ii)\; \; \; \; \; (iv)\; \; \;\ (i)

 
  Excretion in Platyhelminthes - It is through single or paired protonephridium with flame cells. -       Pila has radula (a rasping organ) Bombyx is an arthropoda, it has malpighian tubules. Pleurobranchia is a ctenophore, it has comb plates. Taenia is a platyhelminth, it has flame cells. Option 1)         Option 2) Option 3) Option 4)

Consider the following features:

a. Organs system level of organization

b. Bilateral symmerty

c. True colemates with segmentation of body

Select the correct option of animal group which possess all the above characteristics.

  • Option 1)

    Annelida, Arthropoda and Chordata

  • Option 2)

    Annelida, Arthropoda and Mollusca

  • Option 3)

    Arthropoda, Mollusca and Chordata

  • Option 4)

    Annelida, Mollusca and Chordata

  Metameric Segmentation - Body externally and internally divided into segments with a serial repetition of at least some organs. - wherein Eg. Annelia, Arthropoda and chordate.     Annelida, Arthropoda and Chordata are the phyla that show segmentation. They have organ sysyem level of organization, bilateral symmerty and true coelom. Molluscans also share these feratures but do not show...
Mam ! Anabaena and nostoc aerobics or anaerobic???
@Chinmoy Mahata  Anabaena and nostocs are anaerobic.
difference between indented and braket key?
@Sunil Indented keys have the two leads of each couplet separated by the couplets following the first lead, making it harder to compare the alternatives of a character.  Bracketed keys keep the two leads of every couplet together, allowing for an easier comparison of the alternatives of a character
1551342372954-1767443636.jpg in which animal, muscles is absent in the intestine ?
@Preethi Q. 102 correct option is 1) In NCERT book of biology, on page no 52 you will get this topic that in which kind of animals, muscles are present in their intestine
and also one more thing I want to ask mam does porifera have high regeneration power?
@Rashmi  yes poriferans have remarkable regeneration power.  
Screenshot_2019-02-11-10-46-06-359_com.android.chrome.png 10:46 AM ... 0.08K/s BSNL Mob.. H BSNL MOBILE.. C—780/0 www.entrance360.com Q. 88 X Incorrect In the five-kingdom classification, Chlamydomonas and Chlorella have been inlcuded in Your Answer: Protista Correct Answer: algae Solution: As we learnt in Chlorella and Spirullina - Unicellular alge, rich in protein.
@ Brindha. C. Protista is correct. Five kingdom classification has placed unicellular green algae in photosynthetic protists. Chlamydomonas and Chlorella are unicellular, eukaryotic and photosynthetic. Thus, they are placed in protista as per five kingdom classification.
Is nuclear division not happening then in multinucleate protozoan cell
Multinucleate cells (also called multinucleated or polynuclear cells) are eukaryotic cells that have more than one nucleus per cell, i.e., multiple nuclei share one common cytoplasm. Mitosis in multinucleate cells can occur either in a coordinated, synchronous manner where all nuclei divide simultaneously or asynchronously where individual nuclei divide independently in time and space. The...
What is plasmotomy?
A type of asexual reproduction in which a multinucleate protozoan cell divides into two or more multinucleate daughter-cells without the occurrence of mitosis.
Sonika ma'am I mean the Q 50? Any formula?

@Drmohamed ashraf from this formula you can calculate the no. of protozoans after (n) no of generation. where, a= no. of protozoan whose generation you have to find n= no. of generations, you have to find. its simple, from this you can solve any question related to this.

Which of the following is correctly matched

  • Option 1)

    Aerenchyma-Opuntia

  • Option 2)

    Age pyramid-Biome

  • Option 3)

    Parthenium hysterophorus-Threat to biodiversity

  • Option 4)

    Stratification-Population

 
Option 1) Aerenchyma-Opuntia Option 2) Age pyramid-Biome Option 3) Parthenium hysterophorus-Threat to biodiversity Option 4) Stratification-Population
genus or species have more similar characters????
@teja Species will have more similar characteristics because as we move from species to kingdom the number of similar characteristics decreases.
Madreporite??
@Drmohamed ashraf Madreporite refers to an opening present in echinoderms. Through this opening water is filtered into their water vascular system.
What is autotomy?
Autotomy is a behaviour in which animals shed their one or more parts (appendages). It is often used as self defence mechanism by animals. E.g. Tail loss in lizards, some starfish can also shed their arms
then pls explain it mam
The multi-cellular organisms typically possess a concentric arrangement of tissues in their body. These tissues are derived from the three embryonic cell layers called germinal layers. And these layers are: i)The outer layer that is the ectoderm ii)The middle layer is the mesoderm iii)The inner most layer is the endoderm Endoderm layer is associated with the formation of the stomach,...
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