Fungi,Viruses and Bacterial Plant Diseases

Q. The mung bean variety developed through induced mutations, possesses resistance to which disease(s)?

1. Powdery mildew
2. Yellow mosaic virus
3. Both A & B
4. Black rot

Q. Which part of the tobacco plant is infected by Meloidogyne incognita?

1. Flower
2. Leaf
3. Stem
4. Root

Q.

Which one of the following is not a fungal disease?

1. Rust of wheat

2. smut of bajra

3. red rot of sugarcane

4. black rot of crucifers

Q. The fungus causing foolish seedling disease, was discovered by

1. a Japanese pathologist
2. an American botanist
3. an Indian botanist
4. a Japanese farmer

Q. Pathogens that affect the yield of crops are

1. Bacteria and protozoans
2. Roundworms and methanogens
3. Fungi, viruses and bacteria
4. Euglenoids and insects

Q. Match the crop with disease against which it has acquired resistance
$\begin{array}{cccc}& Crop& & Resistancetodiseases\\ a& Wheat& i& Bacterialblight\\ b& Brassica& ii& Leafandstriperust\\ c& Cauliflower& iii& Blackrot\\ d& Cowpea& iv& Whiterust\\ e& Chilli& v& Chillymosaicvirus,Tobaccomosaicvirus,Leafcurl\end{array}$

1. a - ii, b - iv, c - iii, d - i, e - v
2. a - ii, b - iii, c - iv, d - i, e - v
3. a - iv, b - ii, c - iii, d - i, e - v
4. a - ii, b - iv, c - iii, d - v, e - i

Q. Name the host plant and its part that Meloidogyne incognita infects. Explain the role of Agrobacterium in the production of ds-RNA in the host plant.

Q. How are tobacco plants benefited when nematode-specific genes are introduced into them using certain vectors ? Name the vectors used.

Q. Brown rust of wheat is caused by

1. Bacteria
2. Viruses
3. Fungi
4. Aphids

Q. Match the given diseases with their respective causative agents.
$\begin{array}{cccc}& Disease& & Pathogen\\ 1& Brownrustofwheat& a& Fungus\\ 2& Lateblightofpotato& b& Bacteria\\ 3& Blackrotofcrucifers& c& Virus\\ 4& Turnipmosaic& & \end{array}$

1. 1 - a, 2 - c, 3 - b, 4 - c
2. 1 - a, 2 - a, 3 - b, 4 - c
3. 1 - b, 2 - a, 3 - b, 4 - c
4. 1 - b, 2 - a, 3 - c, 4 - b

Q. Match the crop with disease against which it has acquired resistance
$\begin{array}{cccc}& Crop& & Resistancetodiseases\\ a& Wheat& i& Bacterialblight\\ b& Brassica& ii& Leafandstriperust\\ c& Cauliflower& iii& Blackrot\\ d& Cowpea& iv& Whiterust\\ e& Chilli& v& Chillymosaicvirus,Tobaccomosaicvirus,Leafcurl\end{array}$

1. a - ii, b - iv, c - iii, d - i, e - v
2. a - ii, b - iii, c - iv, d - i, e - v
3. a - ii, b - iv, c - iii, d - v, e - i
4. a - iv, b - ii, c - iii, d - i, e - v

Q. Match List-I with List-II and select the correct answer.

List-I	List-II
a. Ficus benghalensis	$1$. Fibre
b. Melia azadirachta	$2$. Pesticide
c. Cocos nucifera	$3$. Latex
d. Hevea brasiliensis

1. A-$1$, B-$2$, C-$3$, D-$1$
2. A-$1$, B-$1$, C-$2$, D-$3$
3. A-$3$, B-$2$, C-$1$, D-$3$
4. A-$3$, B-$3$, C-$1$, D-$2$

Q. Which fungus is called hallucinogenic fungus and why?

Q. Little leaf disease of brinjal is caused by

1. Virus
2. Mycoplasma
3. Fungi
4. Algae

Q. Which of the following improved varieties is resistant to tobacco mosaic virus?

Q. Match the diseases in plants with the causative organisms.

1. Virus
2. Bacteria
3. Rust
4. Rot
5. Mosaic
6. Fungi