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Biology

CAIE2024

Lunularia cruciata is a primitive plant. Its body consists of a flattened sheet of photosynthetic tissue called a thallus. Fig. 5.1 shows L. cruciata with two different types of reproductive structure, labelled A and B, on its surface. A B Fig. 5.1 (a) Structures A and B and the thallus of L. cruciata are haploid. Explain what is meant by haploid. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [2] (b) Structure A contains pale discs of tissue, C, that can germinate into new L. cruciata. The new plants that develop from C are genetically identical to the parent plant in Fig. 5.1. Structure B contains male sperm that are chemically attracted to swim to female eggs on a neighbouring parent plant. When the egg and sperm fuse, they form structure D. Structure D develops to produce spores that grow into new plants that are genetically different from the two parent plants. Identify which of the structures A, B, C and D are: associated with sexual reproduction ………………………………………… produced by mitosis ………………………………………… the site of meiosis ………………………………………… Each letter may be used once, more than once, or not at all. [3] (cid:300)(cid:209)(cid:266)(cid:190)(cid:288)(cid:180)(cid:237)(cid:200)(cid:245)(cid:207)(cid:298)(cid:197)(cid:266)(cid:221)(cid:250)(cid:184)(cid:254)(cid:215) © UCLES 2024 (cid:300)(cid:228)(cid:197)(cid:250)(cid:212)(cid:293)(cid:282)(cid:264)(cid:227)(cid:243)(cid:268)(cid:194)(cid:220)(cid:177)(cid:270)(cid:299)(cid:285)(cid:258) 9700/43/O/N/24 (cid:293)(cid:213)(cid:213)(cid:213)(cid:181)(cid:181)(cid:197)(cid:245)(cid:197)(cid:261)(cid:245)(cid:261)(cid:197)(cid:213)(cid:293)(cid:245)(cid:197)(cid:213) NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD PMT * 0000800000011 *

Question

Biology

CAIE2023

(a) Describe the structural features of wind pollinated plants such as grasses. [4] (b) State two advantages of self pollination and two advantages of cross pollination. self pollination

Question

Biology

CAIE2023

cross pollination

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