UNIT 4 - NATURAL SCIENCE -

All plants can be classified into two main groups: angiosperms and gymnosperms. ferns and mosses. flowering and non-flowering plants.

Flowering plants are the __________ group of plants on Earth. Most flowering plants use __________ reproduction. They grow ________ which are their __________ organs. These plants reproduce through ________ and produce them in two different ways. smallest; asexual; spores; reproductive; fronds. biggest; sexual; flowers; reproductive; seeds.

Flowering plants reproduce through seeds and produce them in two different ways: angiosperms and gymnosperms. mosses and ferns. angiosperms and mosses.

In angiosperms pollinated flowers produce __________ with seeds inside. cones. fruits. needles.

An example of angiosperm is... a cherry tree. a pine tree.

Gymnosperms have small ________. They don't produce any _____ and their seeds develop in __________. flowers; seeds; needles. fuits; cones; flowers. flowers; fruit; cones.

Many gymnosperms, such as pine trees, have long thing leaves called ... fronds. needles. rhizoids.

Non-flowering plants do not produce... flowers. fruits. seeds.

Non-flowering plants reproduce _____________ using _______. asexually; spores. sexually; capsules.

There are two main groups of non-flowering plants: ferns and gymnosperms. angiosperms and mosses. ferns and mosses.

Ferns have large leaves called... fronds. sori. needles.

Ferns produce spores inside ... capsules. sori. fronds.

In mosses, roots are called... rhizoids. spores. capsule.

Mosses produce spores inside... sori. capsules. cones.

Most plants have three parts: roots, stem and leaves. roots; stem and fronds.

Roots hold the plant in the ... water. root hairs. ground.

Roots absorb water and minerals needed for nutrition from the ground through the... root hairs. rhizoids. stem.

The stem transports materials to and from the... roots. stem. leaves.

Leaves contain ____________, a green substance which is necessary for photosynthesis. petiole. blade. chlorophyll.

_______ in the blade support the leaf and carry water and minerals. petiole. veins.

On the underside of the blade, there are tiny holes, called ... stomata. petiole. veins.

Plants ______ produce their own food. can't. can.

During this process, plants can produce their own food. nutrition. respiration. photosynthesis.

The mixture of water and minerals is called ... glucose. raw sap. chlorophyll.

_________ absorb carbon dioxide through their stomata. roots. stem. leaves.

In certain parts of plant cells called ________, chlorophyll collects solar energy to transform water, minerals and carbon dioxide into glucose and oxygen. chloroplasts. raw sap. stomata.

______ cells carry the glucose, through the stem to all the parts of the plant. Xylem. Phloem.

At night, when photosynthesis stops, plants no longer expel _________. During this time they just release ____________. carbon dioxide: oxygen. oxygen; carbon dioxide.

Plants are called the "_______" of the Earth. heart. lungs. kidneys.

Photosynthesis is the most important process to life in Earth because it consumes ___________, which is toxic to most living things. oxygen. nitrogen. carbon dioxide.