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**Hint:**Conifers, cycads, Ginkgo, and gnetophytes are among the gymnosperms, also known as Acrogymnospermae. The term gymnosperm is derived from the Greek words, gymnos, 'naked', and, sperma,'seed', and literally means 'naked seeds'.

**Complete answer:**

Gymnosperms are a class of plants distinguished by the following characteristics: They lack an outer coating or shell that protects their seeds. They don't make flowers. They do not bear fruit.

any of a class or subdivision (Gymnospermae) of woody vascular seed plants (as conifers or cycads) that contain naked seeds that are not enclosed in an ovary and have motile spermatozoids in some cases — compare angiosperm.

Gymnosperms have the following essential characteristics:

1. They don't make flowers.

2. Seeds do not form inside a fruit. They are fully naked.

3. They are found in colder climates where there is snowfall.

4. They sprout needle-like branches.

5. They are either perennial or woody, growing as trees or bushes.

6. They are not classified as ovary, style, or stigma.

7. Since there is no stigma, they are pollinated directly by bees.

8. They are not classified as ovary, style, or stigma.

9. Since there is no stigma, they are pollinated directly by the wind.

10. Male gametophytes develop two gametes, but only one is usable.

11. Cones with reproductive structures shape.

Examples of gymnosperms are Cycads, Gnetophytes, Ginkgo.

**Note:**

Conifers are a type of tree. Conifers, classified as Pinophyta or Coniferophyta, are the most numerous gymnosperms; woody and with vascular tissue, they are cone-bearing trees and shrubs.

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