Morphology of Flowering Plants Test 72

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Morphology of Flowering Plants Test 72

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Weekly Quiz Competition

Question 1
1 / -0

Elongated peduncle bearing pedicellate flowers continuously in acropetal order is?

A
Corymb

B
Umbel

C
Raceme

D
Head

Solution

A. 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. It is a type of racemose inflorescence.
B. Umbel in which the main axis is reduced very much and all flowers appear to be arising from the same point. It is a type of racemose inflorescence.
C. Raceme in which elongated peduncle has bisexual and pedicellate flowers arranged acropetally. It is a type of racemose inflorescence.
D. Capitulum or head in which the main axis becomes flat and called receptacle. It bears many sessile and small florets. It is a type of racemose inflorescence.

So, the correct answer is 'Raceme'
Question 2
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Inflorescence consisting of a number of flowers arising from the same point with the same level at the top is?

A
Corymb

B
Corymbose-raceme

C
Capitulum

D
Umbel

Solution

A. Corymb in which the main axis is short and lower flowers have long pedicles than upper ones so that all the flowers are brought more or less to the same level. It is a type of cymose inflorescence. The example is iberis.
B. Corymbose raceme is found in mustard.
C. Capitulum or head bears many sessile and small florets. The main axis becomes flat and called receptacle. It is a type of racemose inflorescence. The example is a sunflower.
D. 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 forming an involucre. It is a type of racemose inflorescence. The example is hydrocotyle.

So, the correct answer is 'Umbel'.
Question 3
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A flask-shaped fleshy receptacle enclosing both the types of flowers is present in?

A
Cyathium

B
Hypanthodium

C
Coenanthium

D
Spadix

Solution

A. 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 a single stamen while a single pistil represents a female flower. It is a type of cymose inflorescence. The example is euphorbia.
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 banyan.
C. Coenanthium with a receptacle, instead of forming a closed structure, becomes saucer-shaped with the margins slightly curved up.
D. The spadix is a spike with a fleshy axis and having both male and female flowers. It is surrounded by large colored bracts called spathe. It is a type of racemose inflorescence. The example is palm.

So, the correct answer is 'Hypanthodium'.
Question 4
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Umbel inflorescence occurs in?

A
Coriandrum

B
Colocasia

C
Musa

D
Sunflower

Solution

A. Umbel in which the main axis is reduced very much and all flowers appear to be arising from the same point. It is a type of racemose inflorescence. The example is coriander.
B. The spadix is a spike with a fleshy axis and having both male and female flowers. It is a type of racemose inflorescence. The example is colocasia.
C. The spadix is a spike with a fleshy axis and having both male and female flowers. It is a type of racemose inflorescence. The example is music.
D. Capitulum or head bears many sessile and small florets. The main axis becomes flat and called receptacle. It is a type of racemose inflorescence. The example is the sunflower.

So, the correct answer is 'Coriandrum'.
Question 5
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Match the columns and select the correct options.
Column-I Column-II
(a) Spike (i) Bougainvillea
(b) Capitulum (ii) Coleus
(c) Dichasial cyme (iii) Adhatoda
(d) Multiparous cyme (iv) Zinnia
(e) Verticillaster (v) Asclepias

A
$$a-3, b-4, c-1, d-5, e-2$$

B
$$a-3, b-1, c-4, d-5, e-2$$

C
$$a-2, b-4, c-1, d-5, e-3$$

D
$$a-4, b-2, c-5, d-1, e-3$$

E
$$a-5, b-4, c-1, d-3, e-2$$

Solution

(a) Spike is peduncle having bisexual and sessile flowers. It is type of racemose inflorescence. Example: adhothoda. (3)
(b) Capitulum or head bears many sessile and small florets. The main axis becomes flat and called receptacle. It is type of racemose inflorescence. Example: zinnia. (4)
(c) Dichasial cyme in which two lateral branches develop on the two sides of the terminal flower. Example: bougainvillea. (1)
(d) Multiparous cyme in which there are more than two lateral branches from the base of the apical flower. Example: Asclepias. (5)
(e) Verticillaster is a cluster of sessile or subsessile flowers borne on a dichasial ending in monochasial cyme in the form of condensed whorl on either side of the node. Example: Coleus. (2)

So, the correct answer is 'a-3,b-4,c-1,d-5,e-2'.
Question 6
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A student observed $$34$$ inflorescence in Bougainvillea and $$42$$ inflorescence in Poinsettia. Find out the number of flowers in Bougainvillea and the number of female of flowers in Poinsettia respectively.

A
$$34, 126$$

B
$$204, 164$$

C
$$102, 42$$

D
$$68$$, indefinite

Solution

The inflorescence in the Bougainvillea flower is a simple cyme or cymule. In the cymule, the peduncle ends in a flower and only 2 lateral branches. These are produced which also ends in flowers. Thus, 3 flowered inflorescences will be formed. Flowers are arranged in a basipetal manner. Since the inflorescence number will be given here 34. Thus, the total numbers of flowers would be $$34 \times 3 = 102.$$

Single female flower-like inflorescence of the Euphorbiaceae i.e. Poinsettia is called a cyathium. The single female flower of cyathium has 3 carpels syncarpous pistil. Also, the inflorescence number given here is 42. Thus hence the number of female flowers is 42.

So, the correct answer will be 102,42.

The correct option is C.
Question 7
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Modified hairy calyx is

A
Pappus

B
Perianth

C
Epicalyx

D
Accrescent

Solution

Pappus is the term used for modified hairy calyx that is found in family Asteraceae. It is present below individual floret. It persists and helps in seed dispersal.
A. Pappus is the modified hairy calyx.
B. Perianth is the whorl name for tepals. It is used to denote a condition when the calyx and corolla are absent and instead of sepals of petals, tepals are present.
C. Epicalyx refers to the involucre that is present exterior to the calyx.
D. Accrescent is the condition in which the calyx continue to grow after flowering.
Hence, the correct answer is 'Pappus'
Question 8
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Main role of flower is to

A
Produce offspring

B
Produce hormones

C
Attract insects

D
Secrete honey

Solution

Flowers are the sexual organs that are exclusively meant to produce the male and the female sex organs that can form the male and female gametes within pollen grains and ovules respectively. The gametes will then fertilize to form the zygote and the ovule will ripen to form the seed while the ovary will ripen to form the fruit. The seed serves the function of the protection of the embryo. Upon getting the favourable conditions, the seed will germinate to form a new plant. So, the main role of flowers is to produce offspring through sexual reproduction.
Hence, the correct answer is 'Produce offspring'
Question 9
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Floret is

A
Small fruit

B
Small flower

C
Small sessile flower

D
Small neuter flower

Solution

Floret is the term used to denote the flowers that are present in the inflorescence of the had or capitulum, a striking feature of the family Asteraceae. The inflorescence bears small-sized sessile flowers called the florets, such that the whole inflorescence itself appears as the flower.
Hence, the correct answer is 'Small sessile flower'
Question 10
1 / -0

Coleorhiza is cap-like covering over

A
Radicle in dicots

B
Plumule in dicots

C
Plumule in monocots

D
Radicle in monocots

Solution

The coleorhiza is a sheath protecting the root of the germinating seed of the cereal grains that is in the monocots which is specifically called the radicle of the germinating seed from which the root arises.Its main function is to cover the radicle and root cap. It remains inside the soil and breaks the seed coat but stops the further growth of the root. It is present only in the monocots but not the dicots.
So, the correct option is d. Radicle in the monocot.

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	Column-I		Column-II
(a)	Spike	(i)	Bougainvillea
(b)	Capitulum	(ii)	Coleus
(c)	Dichasial cyme	(iii)	Adhatoda
(d)	Multiparous cyme	(iv)	Zinnia
(e)	Verticillaster	(v)	Asclepias

Morphology of Flowering Plants Test 72

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Morphology of Flowering Plants Test 72

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SHARING IS CARING

Question 1

Corymb

Umbel

Raceme

Head

Solution

Question 2

Corymb

Corymbose-raceme

Capitulum

Umbel

Solution

Question 3

Cyathium

Hypanthodium

Coenanthium

Spadix

Solution

Question 4

Coriandrum

Colocasia

Musa

Sunflower

Solution

Question 5

$$a-3, b-4, c-1, d-5, e-2$$

$$a-3, b-1, c-4, d-5, e-2$$

$$a-2, b-4, c-1, d-5, e-3$$

$$a-4, b-2, c-5, d-1, e-3$$

$$a-5, b-4, c-1, d-3, e-2$$

Solution

Question 6

$$34, 126$$

$$204, 164$$

$$102, 42$$

$$68$$, indefinite

Solution

Question 7

Pappus

Perianth

Epicalyx

Accrescent

Solution

Question 8

Produce offspring

Produce hormones

Attract insects

Secrete honey

Solution

Question 9

Small fruit

Small flower

Small sessile flower

Small neuter flower

Solution

Question 10

Radicle in dicots

Plumule in dicots

Plumule in monocots

Radicle in monocots

Solution

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