Aphids are arthropods. Aphids insert their mouthpieces into the phloem in the stem of a plant to feed. An aphid is shown in Fig. 2.1. Fig. 2.1 Identify two features visible in Fig. 2.1 that can be used to classify an aphid as an insect. 1 .................................................................................................................................... 2 .................................................................................................................................... Fig. 2.2 is a diagram of a cross-section of a dicotyledonous stem. Fig. 2.2 (ii) State the letter in Fig. 2.2 that identifies the structure from which aphids feed. ................................................................................................................................. (iii) State the names of two nutrients transported in the phloem. 1 .................................................................................................................................... 2 ....................................................................................................................................

Biology

IGCSE&ALevel

CAIE

Exam No：0610_w24_qp_43 Year：2024 Question No：2(a)

Answer:

Knowledge points:

1.3.1 List the features in the cells of all living organisms, limited to cytoplasm, cell membrane and DNA as genetic material

1.3.2 List the main features used to place animals and plants into the appropriate kingdoms

1.3.3 • List the main features used to place organisms into groups within the animal kingdom, limited to: – the main groups of vertebrates: mammals, birds, reptiles, amphibians, fish – the main groups of arthropods: myriapods, insects, arachnids, crustaceans

1.3.4 • List the main features used to place organisms into groups within the animal kingdom, limited to: – the main groups of vertebrates: mammals, birds, reptiles, amphibians, fish – the main groups of arthropods: myriapods, insects, arachnids, crustaceans

1.3.5 List the features in the cells of all living organisms, limited to ribosomes for protein synthesis and enzymes involved in respiration

1.3.6 List the main features used to place all organisms into one of the five kingdoms: Animal, Plant, Fungus, Prokaryote, Protoctist

1.3.7 List the main features used to place organisms into groups within the plant kingdom, limited to ferns and flowering plants (dicotyledons and monocotyledons)

1.3.8 List the features of viruses, limited to protein coat and genetic material

8.1.1 State the functions of xylem and phloem

8.1.2 Identify the position of xylem and phloem as seen in sections of roots, stems and leaves, limited to non-woody dicotyledonous plants

8.4.1 more contents

8.4.2 more contents

8.4.3 Define translocation in terms of the movement of sucrose and amino acids in phloem: – from regions of production (source) – to regions of storage OR to regions where they are used in respiration or growth (sink)

8.4.4 Explain that some parts of a plant may act as a source and a sink at different times during the life of a plant

Answer:

Knowledge points:

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