Morphology of Flowering Plants Test 70

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Morphology of Flowering Plants Test 70

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Question 1
1 / -0

Identify the incorrect statements from the following.
P. Cymose inflorescence found in Hibiscus sp.
Q. Hypenthedium is found in Ficus benghalensis.
R. Synandrous stamen is found in Calotropis.
S. Hesperidium type of fruit is mango.

A
R, S

B
P, Q

C
Q, R

D
P, S

Solution

Cymose inflorescence is characterized by the main flowering stalk ending in a flower and the peduncle stops growing. This results in the production of flowers from lateral buds. Further, the flowers in this type of inflorescence shows basipetal succession with the oldest at the apex and youngest at the base. For e.g., Hibiscus, periwinkle etc.
Hypanthodium is a special type of inflorescence where the peduncle is fleshy forming a hollow cup with an apical opening with sessile flowers inside. For e.g., Ficus.
Synandrous stamens where both and filaments and anthers are joined in the same whorl as in Cucurbita maxima.
Hesperidium type of fruit is a berry which has a tough aromatic rind as is found in Citrus sinesis (orange) and Citrus medica.
Question 2
1 / -0

Cyathium and hypanthodium inflorescence are related in having

A
Nectar glands

B
Unisexual flower

C
Both A and B

D
None of the above

Solution

Inflorescence refers to the arrangement of flowers or cluster of flowers on the stem. Cyathium inflorescence is characterized by a condensed floral axis that forms a cup-shaped structure and unisexual flowers in cymose clusters. Hypanthodium inflorescence is characterized by the floral axis being fleshy and closed forming a pear shaped receptacle. Flowers are unisexual in cymose clusters. However, in Cyathium there is the presence of involucre with nectary gland. The similarities between these two inflorescence is the presence of unisexual flowers.
Question 3
1 / -0

Trimerous flower, superior ovary and axile placentation is characteristics of

A
Liliaceae

B
Cucurbitaceae

C
Solanaceae

D
Compositae

Solution

The floral characteristics of trimerous flower, superior ovary and axile placentation are the diagnostic features of the species of Liliaceae family, where the flower is a pedicilate, bracteate with 6 perianth leaves arranged in two whorls, gynoecium being tricarpellary and syncarpous with superior ovary.
Question 4
1 / -0

Cuticle is made up of

A
Glycerol and hydrocarbon polymers impregnated with wax

B
Lipid and hydrocarbon polymers impregnated with wax

C
Proteins and hydrocarbon polymers impregnated with wax

D
Sugar and hydrocarbon polymers impregnated with wax
Solution
- The protective and waxy covering around the epidermis of leaves, young shoots, and other aerial parts of a plant is called the cuticle.
- It comprises lipid and hydrocarbon polymers integrated with wax.
- It acts as a barrier for water-soluble substances and checks the evaporation of water from the epidermis.
So, the correct option is B.
Question 5
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Identify the set of characteristics related to plants belonging to family Fabaceae from the following.

A
Actinomorphic flower, syncarpous ovary and marginal placentation

B
Persistent calyx. epipetalous stamens and leguminous fruit

C
Papilionaceous corolla, monoadelphous stamen and leguminous fruit

D
Vexillary aestivation of corolla, diadelphous stamens and monocarpellary, unilocular ovary

Solution

Fabaceae is distributed all over the world. Its floral characteristics include:
Inflorescence :- racemose
Flower :- bisexual, zygomorphic
Calyx :- sepals five, gamosepalous; imbricate aestivation
Corolla :- petals five, polypetalous, papilionaceous, consisting of a posterior standard, two lateral wings, two anterior ones forming a keel (enclosing stamens and pistil), vexillary aestivation
Androecium :- ten, diadelphous, anther dithecous
Gynoecium :- ovary superior, mono carpellary, unilocular with many ovules, style single
Thus, the correct answe ris option (D),
Question 6
1 / -0

W. L. Johannsen conducted pure line selection experiments on one of the bean varieties. Which of the following characters are associated with this plant?
(I) Cup shaped thalamus
(II) Odd sepal is anterior in position
(III) Actinomorphic flowers
(IV) Axile placentation
The correct combination is

A
(II), (IV)

B
(III), (IV)

C
(I), (II)

D
(I), (III)
Solution
The bean belongs to the family Fabaceae. The characteristics of this class includes:
- Flowers with cup shaped thalamus.
- There are 5 sepals, green, gamosepalous showing valvate aestivation.
- Odd sepal is anterior in position.
Thus, the correct answer is option (C),
Question 7
1 / -0

An inflorescence in which flowers arise from different points but reach the same level is known as

A
Catkin

B
Corymb

C
Umbel

D
Spadix

Solution

The inflorescence is the arrangement of the flower. If the main axis is shortened and lower flower possess longer stalk so that all flowers are brought to the same level. Such type of inflorescence is called as corymb. But if the main axis is short and flower possess stalk of equal length so that flowers are seen to spread out from a common point and such type of inflorescence is called as umbel. Catkin is the modified spike inflorescence that possesses unisexual flowers and Spadix is also a modified inflorescence with the fleshy axis. Thus, the correct answer is option B.
Question 8
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Identify the correct pair of characters with reference to Pteris.
(I) Neck canal cell is uninucleated.
(II) Stem grows vertically in the soil.
(III) Apogamously produced sporophytes are haploids.
(IV) Open dichotomous venation in leaflets.
The correct answer is

A
(II), (IV)

B
(III), (IV)

C
(I), (II)

D
(I), (III)

Solution

Apogamy is the development of 1n sporophytes without gametes and syngamy from vegetative cells of the gametophyte. Reproduction in sterile fern hybrids sometimes is accomplished by the process of apogamy, in which spores possessing the same chromosome complement as the sporophyte are produced. These unreduced spores (with the 2n number of chromosomes) are viable and germinate into normal-appearing gametophytes that usually form male sex organs (antheridia) but not female ones (archegonia). Pteridaceae has a modified type of life cycle known as apogamy, in which fertilization is bypassed. Pteris leaflet is rough, has a mid rib from which the lateral veins with dichotomous branching arise. Venation is open dichotomous venation.
Question 9
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Identify the correct statements from the following.
(I) A single male and a few female flowers are present in a flowers like inflorescence in poinsettia.
(II) Sessile or subsessile flowers formed in the axils of leaves are crowded at the nodes in Leonotis.
(III) In Ficus, a fruit like inflorescence is present with all fertile flowers.
(IV) The floral axis is sympoidal in Hamelia.

A
(II), (IV)

B
(I), (IV)

C
(II), (III)

D
(I), (III)

Solution

The Leonotis, flowers are borne in dense rounded (i.e., spherical) clusters (5-6 cm across) towards the tops of the stems (usually 2-4 clusters per stem). Each of these clusters is arranged directly on the main stem, just above a pair of leaves (i.e., sessile axillary clusters).
Hamelia has the floral axis or the cyme which shows the sympodial form.
So, the correct answer is option A.
Question 10
1 / -0

In Nelumbium, Victoria, Tropaeolum the leaf blade is

A
Peltate

B
Centric

C
Unifacial

D
Ligulate

Solution

In peltate leaf, the leaf blades are deeply lobed. In this, the petiole is attached to the middle of the adaxial side of the leaf. Examples of leaves having peltate leaf blade include Nelumbium, Victoria, Tropaeolum. In this, the petiole is attached to the surface of lamina. Thus, the correct answer is 'Peltate.'

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Morphology of Flowering Plants Test 70

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Question 1

R, S

P, Q

Q, R

P, S

Solution

Question 2

Nectar glands

Unisexual flower

Both A and B

None of the above

Solution

Question 3

Liliaceae

Cucurbitaceae

Solanaceae

Compositae

Solution

Question 4

Glycerol and hydrocarbon polymers impregnated with wax

Lipid and hydrocarbon polymers impregnated with wax

Proteins and hydrocarbon polymers impregnated with wax

Sugar and hydrocarbon polymers impregnated with wax

Solution

Question 5

Actinomorphic flower, syncarpous ovary and marginal placentation

Persistent calyx. epipetalous stamens and leguminous fruit

Papilionaceous corolla, monoadelphous stamen and leguminous fruit

Vexillary aestivation of corolla, diadelphous stamens and monocarpellary, unilocular ovary

Solution

Question 6

(II), (IV)

(III), (IV)

(I), (II)

(I), (III)

Solution

Question 7

Catkin

Corymb

Umbel

Spadix

Solution

Question 8

(II), (IV)

(III), (IV)

(I), (II)

(I), (III)

Solution

Question 9

(II), (IV)

(I), (IV)

(II), (III)

(I), (III)

Solution

Question 10

Peltate

Centric

Unifacial

Ligulate

Solution

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