Which of the following is/are responsible for closing and opening of stomata?
a) stomata
b) xylem
c) Guard cells
d) mesophyll
When the stomata open?
a) during the night time
b) during the daytime
c) during day and night
d) during dawn and dusk time
When the stomata of the leaves are close?
a) during the night time
b) during the daytime
c) during day and night
d) during dawn and dusk time
Transport:
Plants have two transport systems - xylem and phloem . Xylem transports water and minerals. Phloem transports sugars and amino acids dissolved in water.
Transportation is the movement of ……from one place to another.
a) water
b) minerals
c) food
d) materials
Which of the following part/s of the plant is/are responsible for the transport of the materials?
a) stomata
b) xylem
c) phloem
d) both b and c
