What types of placentation are represented by diagrams I and II

Study the diagram below and use it to answer questions (a)-(d)

(a) Name the set-up illustrated in the diagram (b) What is the apparatus used for? (c) What is contained in the part of the apparatus labelled IV? (d) From which part(s) of the apparatus would the reading(s) be taken after the experiment?

(a) State two ways in which the mesophyll layer of the leaf is adapted for photosynthesis (b) In the test for starch in a leaf, why is the leaf boiled in warm alcohol?

List three uses of fibres to plants.

Explain briefly how a large quantity of dead organic materials dumped into a river can be harmful to aquatic life.