Plants purify air during

Name the scientist, who first pointed out that plants purify foul air by bell jar experiment .

Name the scientist, who first pointed out that plants purify foul air by bell jar experiment.

Name the scientist who first pointed out that plants purify foul air.

Name the scientist who first pointed out that plants purify foul air.

Name the steps taken to purify water in a municipal water - treatment plant .

Which of the following statements about Wind Augmentation Purifying Unit (WAYU) is/are correct ? I. The unit is developed by CSIR. II. The device has the capacity to purify air in an area of 5000 square meters.

The first seed plants appeared during

The first seed plants appeared during

The first seed plants appeared during