Name the causative micro-organisms of the following plant diseases :

(a) Rust of wheat (b) Citrus canker (c) Yellow vein mosaic of bhindi (Okra)

Q.

What is the mode of transmission of the following diseases ?

(a) Rust of wheat ( b) Cirus canker (c) Yellow vein mosaic of bhindi (Okra)

Q. Choose the correct option.​

Statement 1: Wheat leaf rust affects citrus plants.​
Statement 2: Yellowing of veins and stunted growth are the symptoms of yellow vein mosaic disease.

Q. Match the plant diseases with their respective causative agent.
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> $$\begin{array}{cc}\text{Plant diseases}& \text{Causative agent}\\ \text{a. Citrus canker}& \text{i. Virus}\\ \text{b. Rust of wheat}& \text{ii. Bacteria}\\ \text{c. Yellow vein mosaic}& \text{iii. Fungi}\end{array}$$

Q. Match the following columns and select the correct option.

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \text{A.}& \text{Wheat leaf rust}& 1& \text{Grapefruit}\\ \text{B.}& \text{Citrus canker}& 2& \text{Okra}\\ \text{C.}& \text{Yellow vein mosaic}& 3& \text{Barley}\end{array}$