Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or dicot stem? Give reasons.

a] List the functions of stomata. b] A potted plant is not watered for about two days. A section of the leaf from that plant is observed under the microscope. How will the stomata appear and why?

A small coconut tree sapling was planted in a well lit part of the house while the house was under construction. As the construction work proceeded, the light was blocked from one side. After few years it was observed that the woody stem of the plant has turns and twists in it. Give reason for this unusual [CBSE 2009] appearance of the coconut tree.

The genotype of green-stemmed tomato plants is denoted by GG and that of purple-stemmed tomato plants as gg. When these two plants are crossed : (i) What colour of stem would you expect in their F_(1) progeny? (ii) Give the percentage of purple-stemmed plant if F_(1) plants are self pollinated. (iii) In what ratio would you find the green and purple colour in the F_(1) progeny?