Biology Today — May 2017

1. The type of vegetative propagation used by horticulturists
   to multiply trees like litchi and pomegranate is
   (a) air layering (b) trench layering
   (c) serpentine layering (d) mound layering.


2. Match the following and select the correct option.
   Column I Column II
   A. Homogametes (i) Cladophora
   B. Dioecious (ii) Fucus
   C. Heterogametes (iii) Papaya
   D. Monoecious (iv) Chlamydomonas
   E. Zygotic meiosis (v) Maize
   (a) A-(i); B-(iii); C-(ii); D-(v); E-(iv)
   (b) A-(ii); B-(iv); C-(i); D-(v); E-(iii)
   (c) A-(iii); B-(i); C-(ii); D-(iv); E-(v)
   (d) A-(v); B-(i); C-(iv); D-(iii); E-(ii)


3. Study the given figure of an embryo sac and select the
   correct option for the labelled parts A-E.
   A
   B
   C
   D

E

A B C D E

(a) Synergids Oosphere Polar

nuclei

Central cell Antipodal

cells

(b) Oosphere Polar nuclei Antipodal

cells

Central cell Synergids

(c) Polar

nuclei

Oosphere Synergids Nucellus Central

cell

(d) Antipodal

cells

Oosphere Polar

nuclei

Central cell Synergids

-1

Total Marks : 160 Duration : 40 Min.

T

his specially designed column enables students to self analyse their

extent of understanding of specified chapters. Give yourself four

marks for correct answer and deduct one mark for wrong answer.

Self check table given at the end will help you to check your

readiness.

Class XII

4. Select the correctly matched pair.
   (a) Rhizomes - Colocasia
   (b) Bulbs - Garlic
   (c) Corms - Artichoke
   (d) Tubers - Adiantum


5. Which of the following is not a function of tapetum?
   (a) It secretes enzymes like callase for degradation of
   callose wall around pollen tetrad.
   (b) It produces Ubisch granules containing sporopollenin
   for exine formation.
   (c) It secretes pectinase enzyme for dehiscence in the ripe
   anther.
   (d) It provides nourishment for pollen grains and
   microspore mother cells.


6. Read the given statements.
   (i) The division of multinucleate parent into many
   multinucleate daughter individuals without nuclear
   division is called plasmotomy.
   (ii) Exogenous budding is observed in Spongilla.
   (iii) Broken tail of lizard is replaced by epimorphosis.
   (iv) Ephyra larvae of Aurelia are formed by fragmentation.
   Of the above statements, the incorrect ones are
   (a) (i), (ii) and (iv) (b) (i) and (iii)
   (c) (ii) and (iv) (d) (iii) and (iv).


7. Self pollination helps in
   (a) ensuring seed production without producing large
   number of pollen grains
   (b) introducing variations and genetic recombination in
   the progeny
   (c) increasing hybrid vigour
   (d) making plants resistant to diseases.


8. In Cucurbita, the pollen tube enters the ovule through the
   ___ and is known as __.

• Reproduction in Organisms
• Sexual Reproduction in Flowering Plants