iGCSE Biology (0610)-6.2 Leaf structure – iGCSE Style Questions Paper 4

Question

(a) Fig. 5.1 shows a section through a leaf.

Fig. 5.2 names some structures found in a leaf and states a function of each of these
structures.
On Fig. 5.2, draw one straight line between each structure and the function it carries out.

                                                                                                                                                                      [4]

(b) Xylem vessels transport water into the leaf.
       State two other functions of xylem vessels.
       1 ………………………………………………………………………………………………………………………………
       2 ………………………………………………………………………………………………………………………………
                                                                                                                                                                                         [2]
(c) Some of the glucose made in the leaf is changed into another compound and stored by the
       plant.
       Name this compound.
       ……………………………………………………………………………………………………………………………. [1]
(d) Some of the structures in the leaf are involved in transpiration.
       Define transpiration.
       …………………………………………………………………………………………………………………………………
       …………………………………………………………………………………………………………………………………
       …………………………………………………………………………………………………………………………………
       …………………………………………………………………………………………………………………………………
       …………………………………………………………………………………………………………………………………
       ……………………………………………………………………………………………………………………………. [2]

Answer/Explanation

Ans:

Question

(a) Fig. 2.1 shows a vertical section through a leaf.

Name the structures labelled A, B and C.
Write your answers in the spaces below.
A ………………………………………………………………………..
B ………………………………………………………………………..
C ………………………………………………………………………..

(b) Potato plants produce new potato tubers underground as part of the process of asexual
reproduction.
Fig. 2.2 shows the amount of carbohydrate stored in the leaves and new tubers of potato
plants, grown in a country in the northern hemisphere, between May and September

(i) Compare the amount of carbohydrate in the leaves and new tubers in May and September. Give an explanation for the differences.
Use data from Fig. 2.2 in your answer.
May
difference ……………………………………………………………………………………………………………
explanation …………………………………………………………………………………………………………
………………………………………………………………………………………………………………………….
September
difference ……………………………………………………………………………………………………………
explanation …………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………. [4]

(ii) State the form in which carbohydrate is stored in potato plants.
………………………………………………………………………………………………………………………[1]

(iii) State two uses, other than storage, for the carbohydrate made by photosynthesis.
1 ……………………………………………………………………………………………………………………….
2 ………………………………………………………………………………………………………………………. [2] [Total: 10]

▶️Answer/Explanation

Ans: 

(a)

A cuticle;
B palisade / palisade mesophyll;
C xylem;

(b)(i)

May
comparison:
there is more carbohydrate in the leaves than in the new potatoes / 4 times as much or 3 a.u. more;
explanation:
potatoes have not grown yet / leaves are photosynthesising / starch being used for growth;
September
comparison:
there is more carbohydrate in the new potatoes than in the leaves / 5 times as much or 4 a.u. more;
explanation:
potatoes are large or fully developed / carbohydrate or glucose or sugar has been sent to new potatoes for storagge (as starch) / leaves photosynthesising less or are dying AW; 

(b)(ii) starch; 

(b)(iii)

respiration / to release energy;
movement;
one example of movement e.g. running or active transport;
growth / repair / cell division;
synthesis of other chemicals;
one named example of synthesis e.g. cellulose or nectar;
nutrient for a consumer;

QUESTIONS:

(a) Table 1.1 shows a key which can be used to identify these cells.

Use this key to identify cells A, B, C, D and E. Cell F has been done for you.

(b) (i) State the main function of a palisade cell.
……………………………………………………………………………………………………………………..
(ii) Suggest and explain two ways in which the structure of a palisade cell is adapted to this function.
adaptation 1 ……………………………………………………………………………………………………….
explanation …………………………………………………………………………………………………………
………………………………………………………………………………………………………………………….
adaptation 2 ……………………………………………………………………………………………………….
explanation …………………………………………………………………………………………………………
…………………………………………………………………………………………………………………….

Answer/Explanation

Ans:

1 (a)

(b) (i) photosynthesis / make carbohydrate/ glucose/ sugar; 

      (ii) contains (many) chloroplasts;
            to absorb energy / light;

            long and thin/ elongated;
            so many can fit into a small area (of the leaf);

            chloroplasts close to edge of cell/ thin cytoplasmic layer;
            so that more light/ energy can be absorbed; 

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