A lateral branch with short internodes and each node bearing a rosette of leaves and a tuft of roots is found in:
1. Chrysanthemum
2. Pistia
3. Jasmine
4. Pineapple
When a shoot tip transforms into a flower,
1. It is always solitary
2. The flower is always short-lived
3. It is never solitary
4. The flower is always long-lived
Chief characteristics of stem do not include:
1. Develops from the plumule
2. Positive phototropic nature
3. Presence of nodes and internodes
4. Endogenously developed multicellular hair
Match aerial modifications of stem given in column I with their descriptions in column II and choose your answer from the codes given below:
|
A |
Phylloclade |
P |
Green, flattened or cylindrical branches of unlimited growth |
|
B |
Cladode |
Q |
Branches of limited growth that become green and flat like a leaf |
|
C |
Bulbil |
R |
Modified vegetative bud with stored food meant for reproduction |
Codes:
|
|
A |
B |
C |
|
1. |
P |
Q |
R |
|
2. |
P |
R |
Q |
|
3. |
R |
P |
Q |
|
4 . |
Q |
R |
P |
In Australian Acacia, the petiole or any part of rachis becomes flattened taking the shape of a leaf and turning green in color. This structure is called as:
(1) Phylloclade
(2) Cladode
(3) Phyllode
(4) bulbil
Identify the correct statement regarding the stem morphology from the following:
| I: | Stems bear only axillary buds. |
| II: | Axillary buds may get modified into thorns as in Citrus |
| III: | Stem tendrils develop from axillary buds as in gourds. |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
In Bougainvillea, thorns are the modifications of
(1) stipules
(2) adventitious root
(3) stem
(4) leaf
Which of the following is not a stem modification?
1. Thorns of citrus
2. Tendrils of cucumber
3. Flattened structures of Opunita
4. Pitcher of Nepenthes
Stems modified into flat green organs performing the functions of leaves are known as
(1) phyllodes
(2) phylloclades
(3) scales
(4) cladodes
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