Morphology of Flowering Plants Test 32

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Morphology of Flowering Plants Test 32

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Question 1
1 / -0

Which ones are related?

A
Dichasium and hypanthodium

B
Verticillaster and spike

C
Hypanthodium and catkin

D
Umbel and corymb

Solution

A. Dichasium in which two lateral branches develop on the two sides of the terminal apical flower. Hypanthodium is fleshy receptacle forming a hollow cavity with an apical opening called ostiole. The flowers are developed on the inner wall of the hollow cavity.
B. Verticillaster is a cluster of sessile or subsessile flowers borne on a dichasial cyme ending in monochasial cyme in the form of condensed whorl on either side of the node. Spike in which peduncle has bisexual and sessile flowers.
C. Hypanthodium is fleshy receptacle forming a hollow cavity with an apical opening called ostiole. The flowers are developed on the inner wall of the hollow cavity. Catkin is the pendulous spike in leaf axis which bears unisexual flowers.
D. Umbel in which the main axis is reduced very much and all flowers appear to be arising from the same point. Corymb in which the main axis is short. Lower flowers have long pedicels than upper ones so that all the flowers are brought more or less to the same level.

So, the correct answer is 'Umbel and Corymb',
Question 2
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Simple umbel has flower arrangement called _______.

A
Acropetal

B
Centripetal

C
Irregular

D
Basipetal

Solution

B) Centripetal

All the pedicellate flowers arise from a single point in a centripetal fashion because the peduncle is reduced. An involucres or a whorl of bracts is often present at the base of flowers.
Question 3
1 / -0

An inflorescence having sessile flowers, a flattened receptacle and an involucre of bracts is?

A
Capitulum

B
Hypanthodium

C
Umbel

D
Spikelet

Solution

A. Capitulum or head bears many sessile and small florets. The main axis becomes flat and called receptacle. At the base of flowers, a cluster of bracts forming an involucre. It is a type of racemose inflorescence. The example is the sunflower.
B. Hypanthodium is fleshy receptacle forming a hollow cavity with an apical opening called ostiole. The flowers are developed on the inner wall of the hollow cavity. The male flowers are situated at the top near the opening, at the bottom are situated the female flowers with long styles and in between both are situated short-styled gall flowers which are sterile. It is a type of cymose inflorescence. The example is ficus.
C. Umbel in which the main axis is reduced very much and all flowers appear to be arising from the same point. At the base of flowers, the cluster of bracts from an involucre. It is a type of cymose inflorescence. The example is hydrocotyle.
D. Spikelet is a small and special spike. Flowers are produced in the axil of fertile bracts called lemma. It is a type of racemose inflorescence. The example is wheat.

So, the correct answer is 'Capitulum'.
Question 4
1 / -0

In a corymb, all the flowers?

A
Arise from the same spot

B
Are covered by a sheath

C
Are brought to the same level

D
Are sessile

Solution

Corymb in which lower flowers have long pedicles than upper ones so that all the flowers are brought more or less to the same level. The main axis is short. It is a type of racemose inflorescence.

So, the correct answer is 'Are brought to the same level'.
Question 5
1 / -0

Cyathium is a type of?

A
Flower

B
Fruit

C
Inflorescence

D
Phyllotaxy

Solution

A. A flower is a reproductive unit in the angiosperms. It is modified shoot, meant for sexual reproduction.
B. Fruit is the presence for the flowering plants or angiosperms.
C. An inflorescence is the arrangement of flowers on the floral axis of the plant. It is of two types - racemose and cymose. Cyathium looks like a single flower. A cup-shaped involucre formed by bracts encloses a single female flower and a number of male flowers. Each male flower is represented by single stamen while a single pistil represents a female flower. It is a type of cymose inflorescence. The example is euphorbia.
D. Phyllotaxy is the pattern in which the leaves are arranged on the stem or its branches.

So, the correct answer is 'Inflorescence'.
Question 6
1 / -0

Rhipidium inflorescence is found in ________

A
Petunia

B
Drosera

C
Solanum nigrum

D
Jasminum

Solution

Rhipidium inflorescence is the flat scorpioid cyme, in which all the flowers are present at the same level. For example Solanum Nigrum. Rhipidium is the fan-shaped cymose inflorescence, in which the branches lie in the same plane. These are suppressed alternately on each side.

Therefore, the correct option is C.
Question 7
1 / -0

Cauliflory is?

A
Production of new plants from cauline buds

B
Formation of flowers from old stem

C
Development of flowers on young branches

D
Clustering of flowers

Solution

Cauliflory is a botanical term referring to plants that flower and fruit from their main stems or woody trunks rather than from new growth and shoots. This can allow trees to be pollinated or have their seeds dispersed by animals which cannot climb or fly.

So, the correct answer is 'formation of flowers from old stem'.
Question 8
1 / -0

Axis of the inflorescence is called?

A
Peduncle

B
Thalamus

C
Petiole

D
Pedicel

Solution

A. The peduncle is the main axis of an inflorescence or the axis bearing a flower or fruit.
B. Thalamus is the thickened part of a stem from which the flower organs grow in angiosperms.
C. The petiole is the cylindrical stalk that joins the leaf base with the leaf blade or lamina.
D. The pedicel is a stem that attaches a single flower to the inflorescence.

So, the correct answer is 'Peduncle'.
Question 9
1 / -0

Flower arrangement in biparous cyme is?

A
Centripetal

B
Basipetal

C
Acropetal

D
Irregular

Solution
Question 10
1 / -0

Capitulum has one or more whorls of bracts called as?

A
Involucel

B
Involucre

C
Epicalyx

D
Cyathium

Solution

Capitulum or head bears many sessile and small florets. The main axis becomes flat and called receptacle. At the base of flowers, a cluster of bracts forms an involucre. Peripheral florets called ray florets are pistillate or neuter and zygomorphic, whereas disc florets are bisexual and actinomorphic is called heterogamous. It is a type of racemose inflorescence. Example: sunflower.

So, the correct answer is 'Involucre'.

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Morphology of Flowering Plants Test 32

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Morphology of Flowering Plants Test 32

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Question 1

Dichasium and hypanthodium

Verticillaster and spike

Hypanthodium and catkin

Umbel and corymb

Solution

Question 2

Acropetal

Centripetal

Irregular

Basipetal

Solution

Question 3

Capitulum

Hypanthodium

Umbel

Spikelet

Solution

Question 4

Arise from the same spot

Are covered by a sheath

Are brought to the same level

Are sessile

Solution

Question 5

Flower

Fruit

Inflorescence

Phyllotaxy

Solution

Question 6

Petunia

Drosera

Solanum nigrum

Jasminum

Solution

Question 7

Production of new plants from cauline buds

Formation of flowers from old stem

Development of flowers on young branches

Clustering of flowers

Solution

Question 8

Peduncle

Thalamus

Petiole

Pedicel

Solution

Question 9

Centripetal

Basipetal

Acropetal

Irregular

Solution

Question 10

Involucel

Involucre

Epicalyx

Cyathium

Solution

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