Question

2 Here are the instructions for examining a moss leaf under the microscope but
they are in the wrong order. Write down the number of each instruction in the
correct order.
1 Lower the leaf gently onto the drop of water with the forceps.
2 Pull off a moss leaf with the forceps.
3 Use a mounted needle to lower a cover slip over the leaf in the water.
4 Place a drop of water on a microscope slide with a pipette.
5 Pick up a piece of moss and a pair of forceps.

Answer 1

Answer:

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Explanation:

A moss is a flowerless, spore-producing plant - with the spores produced in small capsules. The introductory WHAT IS A BRYOPHYTE? page noted that bryophytes have a gametophyte stage and a sporophyte stage. The spore capsule, often with a supporting stalk (called a seta), is the sporophyte and this grows from the gametophyte stage.

You will commonly see the statement that a moss gametophyte consists of leaves on stems. That statement is so close to the whole truth that it's no surprise it's so commonly used.

When a moss spore germinates it first develops a protonema. This is a filamentous to sheet-like growth form, often with a strong resemblance to an algal colony or a fern prothallus. In due course one or more stems grow from the protonema and leaves develop on the stems, giving rise to one or more leafy-stemmed plants. In almost all moss species, the protonemata are ephemeral, with the leafy-stemmed plants the persistent and dominant growth form. But there are exceptions. In some species the protonema is persistent and the leafy part is ephemeral. The term gametophore is used for the stems-and-leaves part and the protonema and gametophore together make up the gametophyte.