Fungi and Viruses

Q.

What Causes The Brown Leaf Spot Of Rice?

Q.

__ is the common bread mould which grows not only in bread but also on a variety of other organic matter such as fruits, animal dung, and leather goods, in warm and humid climate.

Q.

What is the causative agent of bakanae disease seen in rice seedlings?

Q.

Which of the following micro-organisms can cause diseases in plants?

1. Fungi
2. Bacteria
3. Viruses

1. Intercropping

2. Mixed cropping

3. Crop rotation

4. None of these

Q.

Which of the following microorganisms can cause diseases in plants?

1. Intercropping

2. Mixed cropping

3. Crop rotation

4. None of these

Q.

Where is bakanae disease seen?

Q.

Match the branches of biology in Column A with the respective areas of study in Column B.
$\begin{array}{cc}& \\ \text{Column A}& \text{Column B}\\ \text{Ichthyology}& \text{Viruses}\\ \text{Ornithology}& \text{Fishes}\\ \text{Ecology}& \text{Birds}\\ \text{Virology}& \text{Cells}\\ \text{Herpetology}& \text{Diseases}\\ \text{Palaeontology}& \text{Fossils}\\ \text{Cytology}& \text{Snakes}\\ \text{Pathology}& \text{Environment}\end{array}$

Q. Farmers coat the seeds of cereals with rhizobial solution. Why is this done?

1. Rhizobium kills harmful microbes.
2. Rhizobium helps in seed germination.
3. Rhizobium provides oxygen to the seeds.
4. Rhizobium provides nitrogen to the plantlets.

Q.

Which of the following micro-organisms can cause diseases in plants?

1. Fungi
2. Bacteria
3. Viruses

1. Only 2

2. Only 3

3. 1 and 2

4. 1, 2 and 3