Crop Production...

Which one of the following is caused by bacteria?

Identify the disease and its causative agent on the basis of given symptoms.

(i) Small yellow spots formed on upper and lower layer of leaves.

(ii) Diseased area dies leaving hole.

(iii) Spots appearing on twigs and fruits

Beans and peas are preferably grown in nitrogen deficient soil because:

(i) They absorb most of the nitrogen from the soil.

(ii) They are leguminous plants.

(iii) They have rhizobium in root nodules which can fix atmospheric nitrogen.

(iv) They are green plants.

In the production of. _____ Yeast is used.

Bacillus Anthracis was discovered by:

Which one of the following is not a protozoa?

Atmospheric nitrogen can be fixed by:

Which one of the following is a preservative used in preservation of fruits as jams and jellies?

Rhizobium bacteria have _____ with leguminous plants.