Sexual Reproduction in Flowering Plants Test

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Sexual Reproduction in Flowering Plants Test - 49

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Question 1
1 / -0

A botanist collected some fruits with hook-like spines and when the seeds of the same have been germinated they turned out to be asteraceous taxa, bearing asepalous and wind pollinated flowers. The fruit he collected were of .............

A
Xanthium strumarium

B
Lactuca sativa

C
Carthamus tinctorius

D
None of the above

Solution

Xanthium strumarium is also called as rough cocklebur, is a species of annual plants belonging to the Asteraceae family. Upon fruiting these two flowers ripen into two brown to black achenes and they are completely enveloped by the involucre, which becomes a bur. Sphaeranthus indicus is a flowering plant of the genus Sphaeranthus. It is distributed throughout India and has been studied for its potential health promoting properties. Fruits are oblong and have compressed achenes in which pappus is absent. Odor of herb id slightly aromatic but disappears on long storage.
Question 2
1 / -0

The endosperm cell of monocot seed having $$n$$= 24 will have ........ chromosome number of cells in the seed.

A
4

B
72

C
12

D
24

Solution

n= 24 according to the plant. Thus the ploidy level of endosperm in angiosperms is triploid. Thus the number of chromosomes = 3n = 3 x 24 = 72.
Question 3
1 / -0

In which of the following is translator apparatus present?

A
Ovules of mustard

B
Pollen grains of mango

C
Pollinia of Calotropis

D
Ovules of pea

Solution

Calotropis is a large shrub growing to 4m tall. It has clusters of waxy flowers that are either white or lavender in colour. Each flower consists of five pointed petals and a small elegant 'crown' rising from the centre, which holds the stamens. The pollen are arranged in a structure named pollinia which are attached to a glandular, adhesive disc at the stigmatic angle (translator apparatus). These sticky discs get attached to the legs of visiting bees so that pollinia are pulled out when the bee moves away. When such a bee visits another flower, the flower gets pollinated by the sticky pollinium.
Question 4
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Which of the following defines the characteristics of family Asclepiadaceae?

A
Non-sticky

B
Packed in pollinia

C
Winged

D
Very heavy

Solution

The Asclepiadaceae are mostly herbs and shrubs with white sap comprising about 250 genera and 2000 species, many of which are lianous and some of which are cactus like succulents with reduced leaves. The anthers usually produce paired sacs of pollen called pollinia, that are transferred as a unit during pollination. These pollinia are arranged in three different ways: Erect, horizontal and pendulous.
Question 5
1 / -0

Double fertilization in angiosperms was discovered by ..................

A
J.C. Bose

B
Strasburger

C
Maheshwari

D
Nawaschin

Solution

Nawaschin described about double fertilization for the first time. It is the peculiar characteristic of angiosperms. In this process, syngamy causes the formation of zygote, that is the fusion of male and female gamete. Diploid nucleus will fuse with male gamete and forms a triploid endosperm. That is the reason why it is called as double fertilization.
Question 6
1 / -0

Apomixis term was given by .....................

A
Focke

B
Swingle

C
Winkler

D
Navashin

Solution

Apomixis term was given by Winkler (1908). Apomixis in a plant means the development of new plant without fusion of gametes. Although seeds, in general, are the products of fertilization, a few flowering plants such as Asteraceae and grasses, have evolved this special mechanism. Apomixis is a form of asexual reproduction that mimics sexual reproduction.
Question 7
1 / -0

The fusion of secondary nucleus with the second male gamete is triple fusion and the resultant nucleus is triploid or 3 $$n$$. This is the .................

A
First nucleus of the endosperm

B
First nucleus of the nucellus

C
First nucleus of the embryo

D
All of the above

Solution

Formation of triploid endosperm is a characteristic feature of angiosperms which undergo double fertilization. In this case the two male gametes which enter the embryo sac will fuse with egg cell as well as the secondary polar nuclei. The fusion of egg and male gamete makes the embryo. But the fusion of polar secondary nuclei with the male gamete forms the triploid endosperm.
Question 8
1 / -0

The endosperm of gymnosperms is .................

A
Haploid

B
Diploid

C
Triploid

D
Tetraploid
Solution
Correct option: A
Explanation:
The endosperm of the gymnosperm is produced before fertilisation.
It is not a true endosperm, but a nutritive tissue required for the growth of the embryo.
It is formed as a result of the repeated division of haploid megaspores.
The triploid endosperm is seen in angiosperms.
Hence, the endosperm of gymnosperms is "haploid".
Question 9
1 / -0

In a type of apomixis known as adventive embryony, embryos develop directly from the ...........

A
Nucellus or integuments

B
Synergids or antipodals in an embryo sac

C
Accessory embryo sacs in ovule

D
Zygote

Solution

Apomixis is also called as adventive embryony is the method of fertilization from cells other than egg cells. Adventive embryony is possible when the embryo develops from the integuments or nucellus.
Question 10
1 / -0

Caruncle of albuminous dicot seed is derived from _________.

A
Cotyledon

B
Embryo

C
Integument

D
Peduncle

Solution

A. Cotyledon is a part of embryo present within the seed.
B. Embryo is a part of seed that has precursors for roots, stem and leaves.
C. Integument is the outermost multicellular covering of an ovule.
D. Peduncle is the stalk of inflorescence (flowers and fruits).
Caruncle is a fleshy, whitish structure present on micropylar end of seed, which arises due to the proliferation of cells at the tip of outer integument on the side of funiculus or all round the micropyle. Hence, caruncle is derived from integument.
So, the correct answer is 'Integument'.

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Sexual Reproduction in Flowering Plants Test - 49

Result

Sexual Reproduction in Flowering Plants Test - 49

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SHARING IS CARING

Question 1

Xanthium strumarium

Lactuca sativa

Carthamus tinctorius

None of the above

Solution

Question 2

4

72

12

24

Solution

Question 3

Ovules of mustard

Pollen grains of mango

Pollinia of Calotropis

Ovules of pea

Solution

Question 4

Non-sticky

Packed in pollinia

Winged

Very heavy

Solution

Question 5

J.C. Bose

Strasburger

Maheshwari

Nawaschin

Solution

Question 6

Focke

Swingle

Winkler

Navashin

Solution

Question 7

First nucleus of the endosperm

First nucleus of the nucellus

First nucleus of the embryo

All of the above

Solution

Question 8

Haploid

Diploid

Triploid

Tetraploid

Solution

Question 9

Nucellus or integuments

Synergids or antipodals in an embryo sac

Accessory embryo sacs in ovule

Zygote

Solution

Question 10

Cotyledon

Embryo

Integument

Peduncle

Solution

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