Chalk is made up of calcium   carbonate .We teachers use chalk to write on board every class and are exposed to it for longer time. So thought of exploring the microscopic view of chalk dust settled on class room floor during traditional teaching with dusting under the foldscope.


 Chalk dust is considered to be non toxic but if over exposed ,may cause respiratory problems due to its accumulation .Chalk dust is allergic to some people .


 Chalk dust appeared black under the folsscope even though it was white in colour.


 .
 <img alt="chalk dust" class="alignnone size-medium wp-image-93189 gcloudimg" data-attachment-id="93189" data-comments-opened="1" data-image-meta='{"aperture":"2","credit":"","camera":"vivo 1723","caption":"","created_timestamp":"1543051923","copyright":"","focal_length":"3.55","iso":"100","shutter_speed":"0.0063613231552163","title":"","orientation":"0"}' data-image-title="chalk dust" data-recalc-dims="1" height="300" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_93171/chalk-dust.jpg" width="142"/>
 <img alt="IMG_20181124_093158" class="alignnone size-medium wp-image-93190 gcloudimg" data-attachment-id="93190" data-comments-opened="1" data-image-meta='{"aperture":"2","credit":"","camera":"vivo 1723","caption":"","created_timestamp":"1543051918","copyright":"","focal_length":"3.55","iso":"119","shutter_speed":"0.0032776138970829","title":"","orientation":"0"}' data-image-title="IMG_20181124_093158" data-recalc-dims="1" height="300" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_93171/IMG_20181124_093158.jpg" width="142"/>
 <img alt="Chalk powder" class="alignnone size-medium wp-image-93191 gcloudimg" data-attachment-id="93191" data-comments-opened="1" data-image-meta='{"aperture":"2","credit":"","camera":"vivo 1723","caption":"","created_timestamp":"1543052118","copyright":"","focal_length":"3.55","iso":"100","shutter_speed":"0.0092850510677809","title":"","orientation":"0"}' data-image-title="Chalk powder" data-recalc-dims="1" height="300" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_93171/Chalk-powder.jpg" width="142"/>

Chalk dust…

Usage of foldscope during Biology practical class

Cells of leaf

Microworld of Hibiscus @ Exhibition

Petal cells..

Reproduction in yeast by budding &#8211; Class 7

Banana leaf showing parallel venation and stomata

Cockroach -antennae under foldscope

Bougainvillea:reticulate venation of leaf- class 7 B

Chalk dust&#8230;

Chalk dust…

jvvpbangalore

More Posts from jvvpbangalore