Biology Today - February 2018

12. Match Column I with Column II (There can be more than
    one match for items in Column I).
    Column I Column II
    A. Malvi (i) Bacterial disease
    B. Sahiwal (ii) Draught breed
    C. Bird flu (iii) Milch breed
    D. Anthrax (iv) Gobi desert
    E. &DPHOXVEDFWULDQXV (v) Rajasthan
    (vi) H5N1
    (vii) Punjab
    (viii) Viral disease
    (ix) %DFLOOXVDQWKUDFLV
    (x) Two humps
    Passage Based Question


13. Complete the given passage with appropriate words or
    phrases.
    Honey bees are reared in wooden boxes having a large
    (i) with an opening for entry and exit of bees. A number
    of frames coated with (ii) sheets having (iii) imprints are
    vertically placed in the chamber. Each wax sheet known
    as (iv) provides foundation arc for bees to build combs.
    A chamber called (v) is placed over (i). It has additional
    similar frames for more comb foundations. A (vi) queen is
    inducted into the (i). When sufficient honey has been stored,
    combs are removed and (vii) to extract honey.

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.

14. Assertion : Polyploids with odd number of genomes are
    sexually sterile.
    Reason : Odd chromosomes cannot form synapsis during
    meiosis.


15. Assertion : In nature, haploid plants originate from
    unfertilised egg cells.
    Reason : When anthers of some plants are cultured on
    a suitable medium to produce haploid plants, it is called
    anther culture.


16. Assertion : In a bee hive, queen cells are of different
    sizes than the worker cells and drone cells.
    Reason : Queen bee fed on royal jelly is larger than the
    worker and drone bees.
    17. Assertion : Continuous inbreeding reduces fertility and
    even productivity.
    Reason : MOET is an inbreeding method.
    18. Assertion : &DOWDFDWOD/DEHRURKLWD and &LUUKLQDPULJDOD
    are cultured in same pond in fish farming.
    Reason : Surface feeder, column feeder and bottom
    feeder fish are used in composite farming.

Figure Based Questions

19. Carefully study the given figure and answer the following
    questions.

B

A

D

C

Liquid medium

Liquid medium

Explant

(a) Identify the labelled structures A, B, C and D.

(b) Define B.

(c) Why subculturing is necessary for this process?

(d) Which growth regulator is used for C?

20. Study the given flow chart carefully and answer the
    following questions.

Cow is administrated with FSH hormone

B eggs per cycle are derived

Embryos at C cell stage are recovered

A

Artificially inseminated

D

(a) Identify the events that take place at stages A and D

respectively.

(b) State the values of B and C.

(c) What is the name of the technology illustrated by

the given flow chart?

(d) State the significance of this technology.