Tuesday, March 13, 2012


1 [A] : All roots are positively geotropic.
[R] : Respiratory roots are achlorophyllous.

Ans:A is false but R is true
2 Complete tap root stores food material in
i) Raphanus
ii) Daucus
iii) Beta vulgaris

Ans:i and ii
3 Adventious respiratory roots are seen in

4 Plants with the following root modifications are used as green manure

Ans:Nodular roots
5 Study the following and identify the correct item groups
i)Jussiaea    Free floating hydrophyte Floating roots help 
                                                in respiration
ii)Dolichos    Legume plant                 Modified roots 
                                                convert N2 to NH3 
iii)Orobanche    Complete root parasite Damages tobacco crop
iv)Striga    Partial root parasite Damages paddy crop

Ans:i, ii and iii
6 One of the following plants develops parasitic roots at earlier stages of its life and later becomes autotrophic

Ans:Santalum album
7 The plant with largest flowers in the plant kingdom is a/an

8 Inulin is stored in the storage roots of

9 [A] : Vanda is an epiphyte.
[R] : It grows in deficient water supply condition.

Ans:A and R are correct but R is not the correct explanation of A
10 Choose the incorrect pair

Ans:Modified roots of Loranthus – Absorb organic food from host
11 Top shaped roots are seen in

Ans:Beta vulgaris
12 Dead hygroscopic epidermis is seen in the modified roots of
I. Vanda
II. Tinospora
III. Trapa
IV. Taeniophyllum

Ans:I, II
13 Match the following
List – I             List – II
a)Roots carryout                   I)Jussiaea
photosynthesis but 
do not absorb water
B)Roots absorb atmospheric         II)Trapa
moisture but do not 
carry out photosynthesis
C)Roots carry out photosynthesis   III)Taeniophyllum
and absorb water in solvent form
D)Roots carry out photosynthesis   IV)Tinospora
and absorb water in vapor form         V)Vanda 

Ans:A-IV, B-V, C-II, D-III
14 N2 is converted into NH3 by the modified roots of

15 Modified roots of Plant A release O2 during day time. Modified roots of Plant B mainly meant for supplying O2 to the root system of the plant all the time. A and B are respectively
I. Tinospora
II. Jussiaea
III. Rhizophora
IV. Vanda

Ans:II and IV
16 In the life cycle of one of the following plants mineral water is absorbed from the host plant as well as soil.

17 The following modified roots do not have root hairs
I. Root nodules
II. Respiratory roots
III. Velamen roots
IV. Fusiform roots

Ans:II and III
18 Roots with leg-haemoglobin are

Ans:Nodular roots
19 The shape of the bacterium Rhizobium is

Ans:Rod shaped
20 [A]: Legumes are used as Green manure
[R]: Legume roots fix atmospheric Nitrogen into Ammonia

Ans: Both A and R are true and R is the correct explanation of A
21 Longitudinal growth of the stem is due to the activity of its

Ans:Terminal bud
22 [A] : Passiflora is a climber.
[R] : It has sensitive stem modification.

Ans:A and R are correct and R is the correct explanation of A
23 A part of the bud is modified into a climbing organ in

24 Study the following and identify the correct match
Plant                           Function of its modified stem

A. Carissa                   I) Photosynthesis
B. Bougainvillea           II) Storage of food
C. Hugonia                   III) Protection
D. Opuntia                   IV) Climbing
                           V) Protection and climbing

Ans:A-III, B-V, C-IV, D-I
25 Only one internode of the stem stores food materials in

26 Study the following and identify the correct sets
Plant            Modified stem I    Modified stem II
i) Agave     Floral bulbils    Offsets
ii) Oxalis     Root bulbils    Runners
iii) Ruscus      Phyllode            Cladode
iv) Asparagus     Cladode            Stem tuber

Ans:i and ii
27 [A] : Stems of Lippia are involved in vegetative reproduction.
[R] : Vegetative reproduction is carried out by only sub-aerial modified stems.

Ans:A is true but R is false
28 Adventitious roots are formed only at the nodal regions of the following modified stems
i) Corm
ii) Runner
iii) Stolon
iv) Offset

Ans:ii and iv
29 The following modified stems help in vegetative reproduction but do not have adventitious roots during their association with the parental plant

Ans:Stem tubers and bulbils
30 Scale leaves are seen in plants with the following modified stems
i) Cladodes
ii) Phylloclades
iii) Stolons
iv) Corms

Ans:i and iv
31 Aerial branches of one internodal length are seen in

32 Modified stems are absent but modified branches are present in

Ans:Stachys tubifera
33 The following modified stems show relatively more positive geotropism

Ans:Stem tuber
34 Both tunicae and fleshy underground irregularly arranged scale leaves are seen in

Ans:Allium sativum
35 Arrange the following modified stems in a sequence of positively geotropic to negatively geotropic growth patterns
i) Modified stem of Curcuma
ii) Modified stem of Amorphophallus
iii) Modified stem of Stachys tubifera
iv) Modified stem of Mentha arvensis

Ans:iii, i, iv, ii
36 Terminal buds of the following modified stems always transform into an inflorescence

37 The following set of modified stems are always axillary bud modifications

Ans:Cladode, offset, stem tuber
38 Central Potato Research Institute is at

39 Downward obliquely growing branches are seen in

40 Match the following
A. Modified stem with only basal           I) Stem tuber
adventitious roots
B. Modified stem with both lateral         II) Runner 
and basal adventitious roots
C. Modified stem without                   III) Stolon
adventitious roots
D. Modified stem has adventitious          IV) Bulb
roots and leaves only at the nodes
                                           V) Corm

Ans: A-IV, B-V, C-I, D-II

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