Plant Breeding Test

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Plant Breeding Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Choose the incorrect statement from the given options

A
male circumcision is associated with a lower risk of HIV infection among men

B
use of oral contraceptives is associated with increased risk of HIV infection

C
adolescent girls are more susceptible to infection than other aged women

D
oral sex is much less efficient mode of transmission of HIV than is receptive anal intercourse
Solution
- Circumcision is defined as the removal of prepuce by surgery.
- Due to properties of an immature genital tract with increased cervical ectopy or exposed columnar epithelium adolescent girls might be more susceptible infection upon exposure than others.
- Second option is incorrect because there is no relation between oral contraceptive and HIV infection. A person gets HIV only via affected blood transfusion or by intercourse with affected individual.
- Oral sex is much less efficient mode of transmission of HIV than is receptive anal intercourse.
Question 2
1 / -0

Superiority of hybrid over parent is

A
Inbreeding Progeny

B
Selection

C
hybridized progeny

D
Hybrid vigour

Solution

Breeding usually takes place between members of different varieties or strains, and in certain plants of closely related species. The progeny is known as hybrid and has phenotypes showing characteristics which are superior to either of the parent stock. This phenomenon is known as hybrid vigour or heterosis.
Question 3
1 / -0

In bread wheat chromosome number is

A
42 (6 × 7)

B
14 (2 × 7)

C
24 (4 × 6)>

D
21 (7 × 3)>

Solution

In bread wheat, (Triticum aestivum) chromosome number is (AABBDD, 2x or 6n = 42)
Question 4
1 / -0

Which of the agricultural challenges below cannot be solved with transgenic techniques?

A
crops are damaged by frost

B
crops are killed by a virus

C
public concern about safety of synthetic pesticides

D
public preference for organic vegetables

Solution

Public preference for organic vegetables cannot be solved with transgenic techniques. These transgenic technologies afford methods that allow the transfer of genes between different species.
Question 5
1 / -0

Which of the following dies from Ti plasmid infection?

A
rice

B
corn

C
sorghum

D
all of the above

Solution

Tumor inducing plasmids (Ti Plasmids) are double-stranded circular DNA present in Agrobacterium tumefaciens. Ti plasmid ranges from 180-205 kb in size and causes infection in mainly monocotyledonous plants such as rice, corn and sorghum.
Question 6
1 / -0

Shakti, Rattan and Protina are three important lysine rich varieties of

A
Rice

B
pulses

C
wheat

D
Maize

Solution

Shakti, Rattan and Protina are recently developed composite (germplasm complex) varieties of maize, which have a higher lysine and tryptophan content than traditional maize varieties.
Question 7
1 / -0

Plants provide protection from fungal disease by producing

A
protoxins

B
prolectins

C
phytoalexins

D
All of these

Solution

Phytoalexins are phenolic compounds which are not present in healthy plants. They are produced by stimulating the plant by a mechanical or chemical injury. These are fungitoxic substances and inhibit the growth of microorganisms pathogenic to plants. They include ipomeamarone, isocoumarin. Pisatin, orchinol and phaseolin.
Question 8
1 / -0

Varieties developed by pureline method are

A
Homozygous and not uniform

B
Homozygous and uniform

C
Heterozygous and not uniform

D
Heterozygous and uniform

Solution

The progeny of a single self-fertilized homozygous and uniform plant is called pure line selection. It is method of crop improvement.

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Plant Breeding Test - 2

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Plant Breeding Test - 2

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SHARING IS CARING

Question 1

male circumcision is associated with a lower risk of HIV infection among men

use of oral contraceptives is associated with increased risk of HIV infection

adolescent girls are more susceptible to infection than other aged women

oral sex is much less efficient mode of transmission of HIV than is receptive anal intercourse

Solution

Question 2

Inbreeding Progeny

Selection

hybridized progeny

Hybrid vigour

Solution

Question 3

42 (6 × 7)

14 (2 × 7)

24 (4 × 6)>

21 (7 × 3)>

Solution

Question 4

crops are damaged by frost

crops are killed by a virus

public concern about safety of synthetic pesticides

public preference for organic vegetables

Solution

Question 5

rice

corn

sorghum

all of the above

Solution

Question 6

Rice

pulses

wheat

Maize

Solution

Question 7

protoxins

prolectins

phytoalexins

All of these

Solution

Question 8

Homozygous and not uniform

Homozygous and uniform

Heterozygous and not uniform

Heterozygous and uniform

Solution

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