Plant parts

Petals are modified leaves that are found around the reproductive parts of a flower. Petals are usually a very different color to the leaves of a plant. Most plants have green leaves and petals in bright colors like pink or yellow.

Pips are another name for the seeds found in fruit like apples, oranges and watermelons.

A pod is a long, thin seed casing found on plants like peas and beans. Pods are made from two halves joined together, and when the seeds inside are ripe they split open.
The pods of many kinds of peas and bean can be eaten along with the seeds inside if they are picked early enough.

The rind of a fruit is the hard outer layer that you can't eat. Fruits like watermelon and oranges have rinds.

Sap is the thick, sticky fluid that is inside tree branches and stems. You can't see it until the plant is damaged in some way, like having a branch cut off or some kind of insect bores a hole into it.
Many kinds of sap are sweet and are eaten by birds and insects. People collect the sap from maple trees to make maple syrup. Latex is made from sap as well.

Spores are the way some bacteria, fungi, ferns and algae reproduce. One spore can grow into a whole new organism.
Spores are similar to seeds but they only need one parent not a male and a female parent like is needed to make seeds. Spores are also much smaller than seeds and do not have food reserves inside them.

A stalk is a very thin branch, usually holding up flowers.

Another word for stalk is stem.

A stem is the part of the plant that holds up the leaves and flowers. Stems on some kinds of plant continue to get bigger and bigger, and eventually turn into branches.
Another word for stem is stalk.

A stump is the remains of a tree after it has been cut down. Stumps are usually firmly stuck in the ground by the roots of the tree.

Thorns grow on many plants to protect them from animals that want to eat them. Thorns are very sharp and are often hooked so they catch onto your skin and clothes. The thorns in the picture are on a rose bush. Thorny plants are often referred to as briar or brambles.