Plants absorb mineral ions from the soil through their... by a process called...

Transcription

1 Q3. Plants also absorb mineral ions from the soil. Use words from the box to complete the sentences. Plants absorb mineral ions from the soil through their by a process called The mineral ions are then transported up the stem through vessels. Q4. Complete the sentences by putting a cross ( ) in the box next to your answer. (i) Plants absorb water from the soil. The plant cells that absorb water from the soil are called A root hair cells B palisade cells C stomata cells D xylem cells (ii) These cells absorb water by a process known as A active transport B osmosis C photosynthesis D transpiration

2 Q5. * (c) Some species of bears eat leaves. Describe how the structure of a leaf is adapted for photosynthesis. (6)

3 Q6. The table shows the concentration of glucose found in plant cells at different times of the day. time of day 6am 9am midday 3pm 6pm midnight concentrat ion of glucose / mg per g (i) Calculate the change in the concentration of glucose from 6am to midday. answer = mg per g (ii) Describe the pattern shown in the concentration of glucose from 6am to midnight. (iii) Suggest two reasons why the concentration of glucose in the plant cells changes between 3pm and 6pm.

4 Q7. The diagram shows a field containing grass plants. (i) Calculate the area of the field. area of field = m 2 (ii) Describe a method that could be used to estimate the total number of grass plants in this field. (3)

5 Q3. Acceptable Mark roots active transport xylem (3) Q4. Acceptable Mark (i) A root hair cells (ii) B osmosis

6 Q5. Indicative Mark Content QWC * (c) An description including some of the following points leaves have a large surface area contain (many) chloroplasts/chlorophyll for maximum absorption of light waxy cuticle to reduce water loss stomata/pores gas exchange/to take in carbon dioxide and release oxygen guard cells that control size of stoma xylem vessels throughout the leaf deliver water and mineral ions (6) Level 0 No rewardable content a limited description of the structure of a leaf that gives either one adaptation or one function not linked e.g. large surface area or takes in carbon dioxide the answer communicates ideas using simple language and uses limited scientific terminology spelling, punctuation and grammar are used with limited accuracy a simple description of how leaf is adapted for photosynthesis that gives one structure linked to its function in photosynthesis/or two or more adaptations/structures not linked the answer communicates ideas showing some evidence of clarity and organisation and uses scientific terminology appropriately spelling, punctuation and grammar are used with some accuracy a detailed description of how leaf is adapted for photosynthesis with two or more structures related to functions of photosynthesis e.g. the role of stomata in gas exchange and the presence of xylem/vessels that deliver water the answer communicates ideas clearly and coherently uses a range of scientific terminology accurately spelling, punctuation and grammar are used with few errors

7 Q6. Acceptable Mark (i) 16 increases then decreases Correct manipulation of data e.g. trebles from 9am to midday (ii) A description including two of the following points increases up to midday decreases from midday to 6pm / midnight / 2 mg per g remains constant from 6pm to midnight (iii) A suggestion including two of the following points less photosynthesis less sunlight temperature decreases lack of water reference to named use of glucose e.g. respiration no light (at night) reference to enzyme activity Q7. (i) m 2 (ii) A description including any three of the following points use a quadrat/select smaller area of the field place quadrat randomly/select areas randomly count the number of plants in each quadrat/location reference to use of several locations calculate average number of plants from quadrats/ samples multiply sample size up to the total area of the field Acceptable Bald answer 2000 (m 2 ) Accept: multiplied by 2000 m 2 (from 3bi) Mark (3)