Sexual Reproduction in Flowering Plants Test

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Sexual Reproduction in Flowering Plants Test - 56

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Question 1
1 / -0

In monocot embryo, the radicle is produced by ...........

A
Terminal cell

B
Middle cell

C
Epiblast

D
Suspensor

Solution

After fertilization zygote is formed which divides into two cells, the terminal cell and the basal cell. The basal cell produces suspensor cells and the terminal cell divides transversally to produce two cells. Ther terminal cell is pushed to the one side to produce radicle.
Question 2
1 / -0

The characteristic feature of family malvaceae is

A
Monadelphous androecium

B
Polyandrous condition

C
Apocarpous gynoecium

D
Polyadelphous androecium

Solution

The characteristic feature of family Malvaceae is monadelphous androecium.The flowers of Malvaceae are commonly borne in definite or indefinite axillary inflorescences, which are often reduced to a single flower, but may also be cauliflorous, oppositifolious, or terminal. They often bear supernumerary bracts. They can be unisexual or bisexual and are generally actinomorphic, often associated with conspicuous bracts, forming an epicalyx. They generally have five valvate sepals, most frequently basally connate, with five imbricate petals. The stamens are five to numerous, and connate at least at their bases, but often forming a tube around the pistils. The pistils are composed of two to many connate carpels. The ovary is superior, with axial placentation, with capitate or lobed stigma. The flowers have nectaries made of many tightly packed glandular hairs, usually positioned on the sepals.
Therefore, the correct answer is option A.
Question 3
1 / -0

Plumed seeds occur in

A
Naravelia

B
Taraxacum

C
Calotropis

D
Colutea

Solution

Plumed seeds occur in Calotropis. The seeds are compressed, broadly ovoid, with a tufted micropylar coma of long silky hair. The crown of the hair on the seeds favouring anemochory give the plumed appearance.
Thus, the correct answer is option C.
Question 4
1 / -0

When synergids and antipodals make the embryo, it is

A
Apospory

B
Apomixis

C
Amphimixis

D
None of the above

Solution

Antipodals and synergids are the part of female gametophyte/embryo sac that develops from meiosis in megaspore mother cell, i.e., gametogenesis. Reproduction by special sporophytic or gametophytic generative tissues without fertilisation (fusion of male and female gamete) and an embryo is developed from gametophytic tissues (antipodals/synergids) without fertilisation. This process is called as apomixis. Whereas apospory is a type of recurrent apomixis wherein diploid embryo sac is developed from diploid nucellar cells without gametogenesis and fertilisation, amphimixis is the union of two opposite gametes during sexual reproduction to form a diploid zygote and embryo formation by antipodal/synergids do not involve the act of fertilisation.
Thus, the correct answer is option B.
Question 5
1 / -0

The ploidy level of primary endosperm nucleus in Oenothera before
fertilization is ................

A
$$n$$

B
$$3n$$

C
$$2n$$

D
$$5n$$

Solution

Primary endosperm nucleus - the nucleus formed by the fusion of two polar nuclei in the embryo sac of a seed plant prior to fertilization - called also secondary nucleus. Haploid parthenogenesis occurs in plants like Oenothera. The ploidy level of primary endosperm nucleus in Oenothera before fertilization is diploid (2n).
Question 6
1 / -0

There are at least two families ............... where the product of double fertilization soon disintegrates and endosperm development is completely absent.

A
Orchidaceae and podostemonaceae

B
Asteraceae and fabaceae

C
Poaceae and brassiaceae

D
All above

Solution

Endosperm formation is suppressed in Orchidaceae, Trapaceae and Podostemonaceae. In these forms, triple fusion is completed but the fusion product either degenerates immediately or undergo only 1 or 2 divisions. These plants like orchids, lack endosperm in their seeds. Double fertilization is one of the characteristic features of all flowering plants. But endosperm formation is suppressed.
So, the correct answer is 'Orchidaceae and podostemonaceae'
Question 7
1 / -0

The embryos in sporophytic budding are

A
Diploid

B
Haploid

C
Both (A) and (B)

D
None of the above

Solution

Sporophytic budding is otherwise called as apomixis. The sporophytic budding process yields diploid embryos. The sporophytic cells which surround the embryo, sometimes grow to new sporophytes within the seed. This tissue is called the nucellus, and the production of an embryo from such cells is called nucellar embryony. This process may yield two embryos in one seed; one apomictic and the other by fertilization of the egg.
Question 8
1 / -0

Formation of liquid endosperm in coconut takes place because ..................

A
Karyokinesis is not followed by cytokinesis.

B
Karyokinesis is followed by cytokinesis.

C
Formation of liquid endosperm is not dependent upon Karyokinesis and cytokinesis.

D
None of the above.

Solution

Coconut water is the clear liquid inside young green coconuts. In early development, it serves as a suspension for the endosperm of the coconut during their nuclear phase of development. As growth continues, the endosperm mature into their cellular phase and deposit into the rind of the coconut meat. Nuclear endosperm type of endosperm categorizes liquid coconut endosperm. In this type, repeated free nuclear divisions take place; if a cell wall is formed it will form after free nuclear divisions. Commonly, referred to as liquid endosperm.
Question 9
1 / -0

The necrohormone theory for the induction of polyembryony was
proposed by ...............

A
Leroy

B
Haberlandt

C
Maheshwari

D
Winkler

Solution

Causes of polyembryony:
Necrohormone theory: This theory was proposed by Haberlandt. It states that degenerating cells of the nucellus act as source of stimulus to the adjacent cells to divide and form adventive embryos.
So, the correct answer is 'Haberlandt'
Question 10
1 / -0

The phenomenon of polyembryony was first observed in .................

A
$$Mangifera$$

B
$$Lillium$$

C
$$Citrus$$

D
$$Euphorbia$$

Solution

The phenomenon of polyembryony was first discovered in Citrus fruits. In plants, polyembryony often gives rise to the enigma of a single offspring. Polyembryony occurs regularly in many plants and animals. The term is also used in botany to describe the phenomenon of two seedlings emerging from one seed.

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Re-Attempt Weekly Quiz Competition

Sexual Reproduction in Flowering Plants Test - 56

Result

Sexual Reproduction in Flowering Plants Test - 56

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SHARING IS CARING

Question 1

Terminal cell

Middle cell

Epiblast

Suspensor

Solution

Question 2

Monadelphous androecium

Polyandrous condition

Apocarpous gynoecium

Polyadelphous androecium

Solution

Question 3

Naravelia

Taraxacum

Calotropis

Colutea

Solution

Question 4

Apospory

Apomixis

Amphimixis

None of the above

Solution

Question 5

$$n$$

$$3n$$

$$2n$$

$$5n$$

Solution

Question 6

Orchidaceae and podostemonaceae

Asteraceae and fabaceae

Poaceae and brassiaceae

All above

Solution

Question 7

Diploid

Haploid

Both (A) and (B)

None of the above

Solution

Question 8

Karyokinesis is not followed by cytokinesis.

Karyokinesis is followed by cytokinesis.

Formation of liquid endosperm is not dependent upon Karyokinesis and cytokinesis.

None of the above.

Solution

Question 9

Leroy

Haberlandt

Maheshwari

Winkler

Solution

Question 10

$$Mangifera$$

$$Lillium$$

$$Citrus$$

$$Euphorbia$$

Solution

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