Biology Today - May 2018

(Rick Simeone) #1
Match The Columns


  1. Match Column I with Column II.
    Column I Column II
    A. Choanocytes (i) Platyhelminthes
    B. Cnidoblasts (ii) Ctenophora
    C. Flame cells (iii) Porifera
    D. Nephridia (iv) Coelenterata
    E. Comb plates (v) Annelida

  2. Match Column I with Column II. (There can be more than
    one match for items in column I).
    Column I Column II
    A. Mouth circular (i) Petromyzon
    and jawless
    B. Placoid scales (ii) Scoliodon
    C. Uropygial glands (iii) Struthio
    D. Marsupial pouch (iv) Didelphis
    E. Presence of pinna (v) Chimaera
    (vi) Myxine
    (vii) Columba
    (viii) Rattus
    (ix) Macropus
    (x) Cavia


Passage Based Questions
18.(A) Complete the given passage with appropriate words or
phrases.
The animals which posses true coelom are called (i). The
true coelom is a body cavity which arises as a cavity in (ii).
The (ii) provides a cellular lining called (iii) to the cavity. The
coelom is filled with (iv) secreted by the (iii). True coelom is
found in (v) , (vi) and (vii). True coelom is of two types,
(viii) and (ix). The animals which do not have coelom are
called (x).
(B) Amphibians are warm blooded animals. Their skull is
monocondylic and the heart is two chambered. Kidneys are
metanephric and urinary bladder is absent in frog. Their
larval forms are ureotelic whereas adults are ammonotelic.
Twelve pairs of cranial nerves are present in them
Fertilisation is internal and they are mostly viviparous.

Assertion & Reason
In each of the following questions, a statement of Assertion (A)
is given and a corresponding statement of Reason (R) is given
just below it. Of the statements, mark the correct answer as :
(a) if both A and R are true and R is the correct explanation of A
(b) if both A and R are true but R is not the correct explanation of A
(c) if A is true but R is false
(d) if both A and R are false.


  1. Assertion : Gills of chordates differ from the gills of non-
    chordates.


Reason : Gills of chordates occur in pharyngeal gill slits
which are absent in non-chordates.


  1. Assertion : Fishes have venous heart.
    Reason : Only veins are present in the circulatory system
    of fishes.

  2. Assertion : Metamerism is the characteristic feature of
    annelida.
    Reason : Annelids are diploblastic, segmented and
    coelomate animals.

  3. Assertion : Platyhelminthes and molluscs are diploblastic
    animals.
    Reason : In diploblastic animals, an undifferentiated
    layer called mesoderm is present between the ectoderm
    and endoderm.

  4. Assertion : Presence of water vascular system is the
    characteristic feature of Phylum Echinodermata.
    Reason : A perforated plate called madreporite is present
    in water vascular system which helps in locomotion.

  5. Assertion : Direct development is present in Hydra.
    Reason : In direct development, the young ones do not
    resemble the adults.

  6. Assertion : Aschelminthes are called as pseudocoelomates.
    Reason : In aschelminthes, mesoderm is present as
    scattered pouches in between ectoderm and endoderm.

  7. Assertion : In ctenophores, locomotion takes place
    through comb plates.
    Reason : Comb plates are comb-like ciliary plates present
    on the body of ctenophores.

  8. Assertion : Phylum Arthropoda is the largest phylum of
    Kingdom Animalia.
    Reason : Arthropods possess thick chitinous exoskeleton
    and jointed appendages.

  9. Assertion : Taenia solium does not have an alimentary
    canal.
    Reason : Adults of T. solium live as parasites in the small
    intestine of human beings.
    Figure Based Questions

  10. Examine the given figure and answer the questions regarding it.
    (a) What features
    do you find
    peculiar about
    urinogenital
    system of the
    given bird?
    (b) Give valid
    explanation
    for such unique characteristics of birds.
    (c) Where does fertilisation takes place in birds?
    (d) What would happen if in a bird shell gland is
    dysfunctional?

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