Reproduction in Organisms Test

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Reproduction in Organisms Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Flowers are unisexual in:

A
Onion

B
Pea

C
Cucumber

D
China rose
Solution
Correct Option: C
Explanation:
Cucumber flowers are monoecious and unisexual.
Both the male and female flowers appear on the same plant.
The male flowers grow first and the female flowers appear a little later.
Onion, Pea and China rose plants bear bisexual flowers.
Hence, flowers are unisexual in cucumber.
Question 2
1 / -0

Which of the following is a mode of vegetative propagation in ginger?

A
Bulbils

B
Runners

C
Rhizome

D
Offsets
Question 3
1 / -0

Which of the following is wrong statement?

A
Isogametes are similar in structure, function and behavior.

B
Anisogametes differ either in structure, function or behavior.

C
In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile.

D
Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy.
Solution
Correct option: C
Explanation:
In oomycetes, the female gamete is larger and motile while the male gamete is smaller and non-motile.
Some oomycetes are water moulds, white rusts, downy mildew etc.
Isogametes (iso meaning same) are similar in structure, function and behaviour.
Anisogametes are the opposite, that is they differ in structure, function and behaviour.
Hence, the wrong statement is that oomycetes female gamete is smaller and motile, while the male gamete is larger and non-motile.
Question 4
1 / -0

Examine the figures (A-D) given above and select the right option out of 1-4, in which all the four structures A, B, C and D are identified correctly.
A B C D
1 Sucker Seta Megaspore mother cell Gemma cup
2 Rhizome Sporangiophore Polar cell Globule
3 Runner Archegoniophore Synergid Antheridium
4 Offset Antheridiophore Antipodals Oogonium

A
4

B
3

C
2

D
1
Solution
- Offset (A) is a short thick branch that produces a new plant at its tip. It is produced asexually. It grows from the main stem of the parent plant.
- Antheridiophore (B) is a gametophore that bears the antheridia only. It is an outgrowth of a prothallium. It is seen in liverworts.
- Antipodal cells (C) are haploid cells in found in angiosperms. These present at the chalazal end farthest from the micropyle. It nourishes the embryo.
- Oogonium (D) is the female sex organ. It contains one or more oospheres. It grows out from one of the nodes.
Thus, the correct answer is option A.
Question 5
1 / -0

Select the mismatched pair out of the following

A
Rhizome - Dryopteris, Nelumbo nucifera

B
Corm -Crocus sativus, Amorphophallus

C
Sucker - Curcuma domestica, Zingiber officinale

D
Tuber - Helianthus tuberosus, Solanum tuberosum
Solution
Correct Option- C
Explanation-
A sucker in plants can be defined as a plant growth that develops from the part of the rootstock that has undergone grafting.
The sucker plants never grow from the seeds like other plants, rather it grows from the part of the root at the bottom part away from the plant body.
Curcuma domestica and Zingiber officinale, also known as turmeric and ginger respectively are the rhizomatous plants that grow their baby plant from their root itself.
Hence, the mismatch pair is Curcuma domestica and Zingiber officinale.
Question 6
1 / -0

Assertion
Clones are produced by sexual reproduction and the same sexual process.
Reason
These are prepared by a group of cells descended from many cells or by inbreeding of a heterozygous line.

A
If both the assertion and the reason are true and the reason is a correct explanation of the assertion

B
If both the assertion and reason are true but the reason is not a correct explanation of the assertion

C
If the assertion is true but the reason is false

D
If both the assertion and reason are false

E
If the assertion is false but reason is true

Solution

Clones are asexually produced. These have same genotype and phenotype like parent.
So, the correct answer is 'If both the assertion and reason are false'
Question 7
1 / -0

Fertilization is fusion of

A
Diploid spermatozoan with diploid ovum to form diploid zygote

B
Haploid spermatozoan with diploid ovum to form diploid zygote

C
Diploid spermatozoan with haploid ovum to form diploid zygote

D
Haploid spermatozoan with haploid ovum to form diploid zygote

Solution

Fertilization is the process of fusion of a haploid sperm (spermatozoan) with a haploid ovum. During this process, the diploid cell is formed called as a zygote. A zygote is the initial stage of formation of multicellular organisms. Thus, the correct answer is option D.
Question 8
1 / -0

During the fourth and sixth cleavage of the zygote

A
Mesomeres give rise to endoderm

B
Mocromeres give rise to ectoderm

C
Mesomeres give rise to mesoderm

D
Macromeres give rise toe ectoderm
Question 9
1 / -0

Reptile and bird eggs are

A
Macrolecithal

B
Oligolecithal

C
Mesolecithal

D
Alecithal

Solution

Reptiles and birds are terrestrial animals. They lay large yolk-rich eggs which are covered with a porous shell. As the eggs are rich in yolk they can support the development of an embryo. Hence, embryogenesis occurs outside the body of the animal inside the egg. Such yolk-rich eggs are called as macrolecithal eggs.
So, the correct answer is option A.
Question 10
1 / -0

Egg with peripheral cytoplasm around the yolk is

A
Isolecithal

B
Microlecithal

C
Telolecithal

D
Centrolecithal

Solution

Centrolecithal eggs have yolk concentrated in the center as in insects.
Telolecithal eggs have yolk concentrated at one end.
Isolecithal eggs have yolk evenly distributed in the cytoplasm.
Microlecithal eggs have a very little yolk.
So, the correct answer is option D.

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	A	B	C	D
1	Sucker	Seta	Megaspore mother cell	Gemma cup
2	Rhizome	Sporangiophore	Polar cell	Globule
3	Runner	Archegoniophore	Synergid	Antheridium
4	Offset	Antheridiophore	Antipodals	Oogonium

Reproduction in Organisms Test - 20

Result

Reproduction in Organisms Test - 20

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SHARING IS CARING

Question 1

Onion

Pea

Cucumber

China rose

Solution

Question 2

Bulbils

Runners

Rhizome

Offsets

Question 3

Isogametes are similar in structure, function and behavior.

Anisogametes differ either in structure, function or behavior.

In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile.

Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy.

Solution

Question 4

4

3

2

1

Solution

Question 5

Rhizome - Dryopteris, Nelumbo nucifera

Corm -Crocus sativus, Amorphophallus

Sucker - Curcuma domestica, Zingiber officinale

Tuber - Helianthus tuberosus, Solanum tuberosum

Solution

Question 6

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

If the assertion is true but the reason is false

If both the assertion and reason are false

If the assertion is false but reason is true

Solution

Question 7

Diploid spermatozoan with diploid ovum to form diploid zygote

Haploid spermatozoan with diploid ovum to form diploid zygote

Diploid spermatozoan with haploid ovum to form diploid zygote

Haploid spermatozoan with haploid ovum to form diploid zygote

Solution

Question 8

Mesomeres give rise to endoderm

Mocromeres give rise to ectoderm

Mesomeres give rise to mesoderm

Macromeres give rise toe ectoderm

Question 9

Macrolecithal

Oligolecithal

Mesolecithal

Alecithal

Solution

Question 10

Isolecithal

Microlecithal

Telolecithal

Centrolecithal

Solution

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