CIE iGCSE Co-Ordinated Science B8.1 Xylem and phloem Exam Style Questions Paper 3
Question
(a) Fig. 4.1 is a photomicrograph of a cross-section through a root.
The boxes on the left show the letters of the parts labelled X and Y in Fig. 4.1.
The boxes on the right show some functions.
Draw lines to link each part with its main function(s).
Draw three lines.
(b) State the function of phloem.
(c) Mineral ions are necessary for plant health.
(i) Explain why nitrate ions are required for growth.
(ii) Magnesium ions are used to make a substance required for photosynthesis.
State the name of this substance.
(d) Table 4.1 shows some of the requirements for the processes of germination and photosynthesis.
Place ticks (✓) in the boxes to show the requirements for each process.
▶️Answer/Explanation
Ans : 4(a)
one mark for each correct line
;;;
4(b) transport of, dissolved sugars / sucrose / amino acids ;
4(c)(i) (nitrate ions) are needed to, synthesise / make, amino acids ;
amino acids make up proteins (which are required for growth) ;
one mark for each correct line
;;;
4(c)(ii) chlorophyll ;
4(d)
1 mark for each correct row ;;
Question
(a) Fig. 7.1 is a drawing of a cross-section of a leaf.
State the names of the parts labelled A, B and C in Fig. 7.1.
A …………………………………………………………………………
B …………………………………………………………………………
C …………………………………………………………………………
(b) Fig. 7.2 is a cell from the palisade mesophyll layer of the leaf.
On Fig. 7.2:
• Identify the part where photosynthesis takes place with a label line and the correct name.
• Identify the part that contains the genetic material with a label line and the letter X.
(c) Describe the process of photosynthesis.
(d) Plants need nitrate ions to make an important substance.
Circle the name of this substance.
amino acid fatty acid starch
glycogen glycerol
(e) State the name of the cell that absorbs mineral ions in a plant.
(f) State the name of the vessels that transport mineral ions in the stem.
▶️Answer/Explanation
Ans : 7(a) A – cuticle ;
B – (lower) epidermis ;
C – stoma / stomata ;
7(b) one chloroplast with label line ;
with correct name ;
nucleus labelled with an X ;
7(c) (process used in plants / producers) to manufacture glucose ;
from raw materials / carbon dioxide and water ;
using light energy ;
7(d) amino acids circled ;
7(e) root hair (cell) ;
7(f) xylem ;