Botany Vocabulary in English

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce glucose and oxygen. This happens in cells containing chlorophyll, mainly in leaves. Respiration is almost the opposite: plants (and all living things) break down glucose using oxygen to release energy, producing carbon dioxide and water. Plants do both processes, but during daylight hours, photosynthesis produces more oxygen than respiration consumes.

A deciduous tree loses all its leaves at a certain time of year — in temperate climates, this is usually in autumn. The tree remains bare through winter and grows new leaves in spring. Examples include oak, maple, and beech. An evergreen tree keeps its leaves year-round. Individual leaves still fall and are replaced, but the tree never appears bare. Examples include pine, holly, and eucalyptus.

Pollination is the transfer of pollen from the male parts (stamens) of a flower to the female parts (pistil) of the same or another flower, often carried by insects, wind, or water. Fertilisation is what happens next: the pollen grain travels down to the ovary and fuses with an egg cell, forming a seed. Pollination is the delivery; fertilisation is the union.

A seed is a complex structure containing a plant embryo and a food store, protected by a seed coat. Seeds are produced by flowering plants and conifers after fertilisation. A spore is a much simpler, single-celled reproductive unit produced by plants like ferns and mosses, as well as fungi. Spores do not contain a food reserve and require very specific conditions to germinate.

A perennial is a plant that lives for more than two years. Unlike annuals, which complete their life cycle in one growing season, or biennials, which take two years, perennials return year after year from their root systems. Many garden favourites — lavender, hostas, and peonies — are perennials, making them cost-effective and low-maintenance choices for gardeners.

Chlorophyll is the pigment that allows plants to capture sunlight and use its energy to drive photosynthesis. Without chlorophyll, plants could not produce glucose from sunlight, water, and carbon dioxide. This would collapse food chains, since plants are the primary producers in most ecosystems. Chlorophyll is also why plants appear green: it absorbs red and blue light but reflects green light back to our eyes.

A parasitic plant extracts nutrients from a host plant without giving anything in return, often weakening or killing the host. Dodder and mistletoe are examples. A plant in symbiosis has a mutually beneficial relationship with another organism — both parties benefit. Many legume plants, for example, have symbiotic bacteria in their roots that fix nitrogen from the air, enriching the soil.

Germination begins when a seed absorbs water and swells, triggering metabolic processes inside. The seed coat splits and a root tip (radicle) emerges downward, followed by a shoot tip (plumule) that grows upward toward light. The young plant relies on food stores within the seed until its first leaves open and photosynthesis can begin. Temperature, moisture, and sometimes light are key environmental triggers.

IELTS Academic reading frequently includes texts on ecology, farming, deforestation, and plant biology. Common botany words in these passages include: photosynthesis, ecosystem, species, germination, habitat, pollination, root system, and adaptation. Building botany vocabulary directly improves comprehension scores in Task 1 (diagrams of plant cycles are very common) and reading passages.

A stem is the main stalk of any plant, from small herbs to large shrubs — it supports leaves and flowers and transports water and nutrients. A trunk is specifically the main woody stem of a tree, much larger and covered in bark. Both perform the same basic functions, but trunk is used only for trees, while stem is used for all plant types.