KS3 CIE Structure of the Flower Mark Scheme | KS3 CIE 花的结构评分标准

📚 KS3 CIE Structure of the Flower Mark Scheme | KS3 CIE 花的结构评分标准

In KS3 CIE Science, questions on the structure of the flower are common in the Biology strand. The mark scheme rewards accurate use of reproductive terminology, correct identification of parts on a diagram, and clear explanations of pollination, fertilisation, seed and fruit formation.

在 KS3 CIE 科学中，关于花的结构的问题在生物学部分很常见。评分标准奖励准确使用生殖术语、正确识别图中的部分，以及清晰解释传粉、受精、种子和果实的形成。

This article summarises the mark points that examiners look for, together with common errors to avoid, so you can answer flower questions with confidence.

本文总结了考官寻找的给分点以及需要避免的常见错误，以便你能自信地回答关于花的问题。

1. Flower Structure Terminology | 花的结构术语

The mark scheme expects you to use the correct scientific names, not everyday words. For example, write ‘anther’, not ‘pollen bag’.

评分标准要求使用正确的科学名称，而不是日常用语。例如，写 ‘anther’，而不是 ‘pollen bag’。

• The stamen is the male reproductive organ. It consists of the anther and the filament.

  雄蕊是雄性生殖器官，由花药和花丝组成。

• The anther produces pollen grains, which contain the male gametes.

  花药产生花粉粒，花粉粒中含有雄配子。

• The filament holds the anther in a position where pollen can be transferred.

  花丝将花药支撑在能传播花粉的位置。

• The carpel or pistil is the female reproductive organ. It consists of the stigma, style and ovary.

  心皮或雌蕊是雌性生殖器官，由柱头、花柱和子房组成。

• The stigma is sticky to catch pollen; the style connects the stigma to the ovary.

  柱头有黏性以粘住花粉；花柱连接柱头和子房。

• The ovary contains ovules, and each ovule contains a female gamete.

  子房含有胚珠，每个胚珠含有一个雌配子。

• The sepal protects the flower in the bud stage, and the petal often attracts pollinators.

  花萼在花蕾期保护花，花瓣通常吸引传粉者。

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2. Functions of the Male and Female Parts | 雄性和雌性部分的功能

Examiners often award one mark per function linked to the correct part. Avoid listing a part without its function when the question asks ‘describe the function’.

考官通常每正确对应一个部分的功能给一分。当题目要求 ‘describe the function’ 时，不要只列出部分而不说明功能。

The anther produces and releases pollen. The filament supports the anther so that insects or wind can remove pollen.

花药产生并释放花粉。花丝支撑花药，使昆虫或风能够带走花粉。

The stigma receives pollen and provides a sticky surface for pollen grains to attach. The style allows the pollen tube to grow down towards the ovary.

柱头接收花粉，并为花粉粒提供粘附的表面。花柱使花粉管能够向下生长到达子房。

The ovary protects the ovules and develops into a fruit after fertilisation. The ovule develops into a seed.

子房保护胚珠，受精后发育成果实。胚珠发育成种子。

Petals are usually brightly coloured and scented to attract insects or birds. Nectaries produce nectar as a food reward for pollinators.

花瓣通常颜色鲜艳并有香气，以吸引昆虫或鸟类。蜜腺产生花蜜，作为传粉者的食物奖励。

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3. Pollination in the Mark Scheme | 评分标准中的传粉

Pollination is the transfer of pollen from the anther to the stigma. It must be stated clearly: pollen must come from the anther and land on the stigma.

传粉是花粉从花药传到柱头的过程。必须清楚说明：花粉必须来自花药并落在柱头上。

Self-pollination occurs when pollen lands on the stigma of the same flower or another flower on the same plant. Cross-pollination occurs when pollen is transferred to a flower on a different plant of the same species.

自花传粉是指花粉落在同一朵花或同一植株另一朵花的柱头上。异花传粉是指花粉被传到同种不同植株的花上。

Insect-pollinated flowers often have bright petals, scent, nectar, sticky pollen grains and a sticky stigma inside the flower.

虫媒花通常有鲜艳的花瓣、香气、花蜜、黏性花粉粒和位于花内的黏性柱头。

Wind-pollinated flowers often have small or dull petals, no scent or nectar, large amounts of light pollen, and feathery stigmas hanging outside the flower.

风媒花通常花瓣小或不明显，没有香气或花蜜，产生大量轻质花粉，并有悬挂在花外的羽毛状柱头。

Marks are given for using comparative statements, such as ‘sticky pollen’ for insect pollination and ‘light, smooth pollen’ for wind pollination.

使用对比性陈述可以得分，例如虫媒传粉的 ‘黏性花粉’ 和风媒传粉的 ‘轻而光滑的花粉’。

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4. Fertilisation Process and Its Mark Points | 受精过程及其给分点

Fertilisation in plants is the fusion of a male gamete from the pollen grain with a female gamete in the ovule. The mark scheme requires more than just ‘pollen meets ovule’.

植物的受精是花粉粒中的雄配子与胚珠中的雌配子融合。评分标准要求的不仅仅是 ‘花粉遇到胚珠’。

After pollination, a pollen grain on the stigma grows a pollen tube down the style. The pollen tube carries the male nucleus to the ovule.

传粉后，柱头上的花粉粒长出花粉管，沿着花柱向下生长。花粉管将雄核运送到胚珠。

The pollen tube enters the ovule through the micropyle. The male nucleus then fuses with the egg cell nucleus inside the ovule.

花粉管通过珠孔进入胚珠。雄核随后与胚珠内的卵细胞核融合。

This fusion forms a zygote, which develops into the embryo plant within the seed.

这种融合形成合子，合子在种子内发育成胚。

Examiners often award one mark for mentioning the pollen tube growing down the style, one for the male nucleus travelling to the ovule, and one for fusion with the egg cell.

考官通常对提到花粉管沿花柱向下生长给一分，对雄核到达胚珠给一分，对与卵细胞融合给一分。

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5. Seed and Fruit Formation | 种子和果实的形成

After fertilisation, the ov

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