CTET 2 Math and Science Feb 2016 Paper

Which of the following make(s) good open ended question(s)?
A. What difficulties would we face if our bodies did not have muscles in it?
B. What is the difference between the stem of a rose plant, mango tree and tulsi?
C. Snake and snail have very different styles of movement. Why is it so?
D. Observe various roots and write their features.