From which part of turmeric, is the turmeric powder obtained?

Which one among the following animals does not undergo periodic moulting of their external body covering?

Presbyopia is a visual defect caused by

Which one among the following is not a factor that affects direction of wind?

Which one, among the following atmospheric gases, filters out most of the ultraviolet radiation of the Sun?

Which of the following is the main characteristic of Mediterranean climate?