Water hyacinth is one of the most invasive weeds primarily because:

1. It gets adapted to any fresh water body easily

2. It produces secondary metabolites against herbivores

3. It can propagate vegetatively at a phenomenal rate

4. It is predated upon by a large number of organisms

Subtopic:  Asexual Reproduction |
 78%
From NCERT
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Isogametes are seen in:

1. Cladophora

2. Fucus

3. Human beings

4. Ficus

Subtopic:  Events during Sexual reproduction |
 79%
From NCERT
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The number of chromosomes in a meiocyte of the fruit fly is:

(1) 4

(2) 8

(3) 12

(4) 16

Subtopic:  Events during Sexual reproduction |
 65%
From NCERT
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The most critical event in sexual reproduction is:

(1) Gametogenesis

(2) Gamete transfer

(3) Fertilization

(4) Embryogenesis

Subtopic:  Events during Sexual reproduction |
 74%
From NCERT
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With respect to organisms exhibiting internal fertilization, organisms exhibiting external fertilization show:

1. More variations

2. Great synchrony between sexes

3. Large female size than males

4. Less vulnerability to predation

Subtopic:  Events during Sexual reproduction |
 66%
From NCERT
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Ginger is vegetatively propagated through:

1. Rhizome

2. Bulbil

3. Stolon

4. Offset

 

Subtopic:  Asexual Reproduction |
 95%
From NCERT
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In animals exhibiting internal fertilization:

1. There is high synchrony between the two sexes

2. The chances of desiccation of the embryo is high

3. The male gamete is motile

4. Vulnerability to predators is increased

Subtopic:  Events during Sexual reproduction |
 69%
From NCERT
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Rotifers:

(1) Exhibit adult reproductive structures in juvenile phase

(2) Are plants that can be both monoecious or dioecious

(3) Produce gametes by mitosis

(4) Are animals capable of reproducing by parthenogenesis

Subtopic:  Events during Sexual reproduction |
 79%
From NCERT
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With respect to external fertilization, which of the following is not an advantage of internal fertilization?

1. A decreased risk of disease transmission

2. Minimal waste of gametes

3. Greater chances of individual egg fertilization

4. Relatively longer time of egg protection

Subtopic:  Events during Sexual reproduction |
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Match Column I with column II and select the correct option using the codes given below:

 

Column I

 

Column II

A.

Pistils fused together

1.

Gametogenesis

B.

Formation of gametes

2.

Pistillate

C. 

Hyphae of higher ascomycetes  

3.  

Syncarpous

D.

Unisexual female flower

4.

Dikaryotic

Codes:

 

A    

B     

C     

D

(1)

4

3

2

1

(2)

2

1

4

3

(3)

1

2

4

3

(4)  

3

1

4

2

Subtopic:  Sexual Reproduction |
 72%
From NCERT
NEET - 2016
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