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Morning AS Level Biology A H02002 Depth in biology Questions And Answers Latest 2024/ 2025 Graded A+ | 100% Verified!!
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Morning AS Level Biology A H02002 Depth in biology Questions And Answers Latest 2024/ 2025 Graded A+ | 100% Verified!!

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  • September 13, 2024
  • 6
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • morning as level biology a h02002 depth in biology

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Morning AS Level Biology A H02002 Depth in

biology


1.Phloem tissue is made up of different cell types. Identify the type of

phloem cell into which the stylet is inserted to obtain the sap: sieve tube

element

2.Separate samples of the sap were tested for the presence of glucose,

starch and sucrose. Using Table 1, complete the following passage, using

the most appropriate terms

In order to test for the presence of glucose, .................................

................................. was added to the sap sample and boiled. The final colour

was ....................................... and so it was possible to arrive at the conclusion

shown in Table 1. When iodine solution was added to the sap sample, the

final colour was ................................................... . To test for the presence of


1/
6

, sucrose, the sample was first boiled with.....................................................After

the rest of the test had been completed, the colour of the mixture indicated

that sucrose was present in the sample: 1. Benedicts solution

2.Blue

3.Brown

4.Acid

3.Sucrose is carried in phloem sap from source to sink. (i) Explain why

starch is not transported in the sap: Because it is not soluble

4.Suggest why sucrose is a more suitable transport molecule than glucose:

less likely to, leave / exit / diffuse out of (sieve

tubes loading uses transport proteins

5.Name the cell labelled B: erythrocyte

6.Fig. 2, on the insert, is a photomicrograph of a mammalian blood smear.

(a) Calculate the image length, in µm, represented by the scale bar. Give

your answer to 2 significant figures: 14 or 15 or 16 ÷ 1250 x 1000= 12

2/
6

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