Which of the following makes good open-ended question(s)?
A. What difficulties would we face if our bodies did not have muscles inti?
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.
(a) Only A
(b) Only C
(c) A and C
(d) B and D