Define lumen.

Define guano.

Define Paleontology.

(a) Define mineral. (b) Define Ore.

These questions consist of two statement each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is a correct explanation of the Assertion. B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. Assertion: There is large deposition of lignin in the lumen of tracheids. Reason. The lumen of tracheids is narrow.

Define power. Give its S.I unit and define it.

Define a event.

Define disjunction.

Define venation.