"Photosynthesis" PPT courseware

Description

"Photosynthesis" PPT courseware

Part One: Situation Import

Leaves are the main organs of plants for photosynthesis. Although leaves come in many shapes, their composition and structure are basically the same. What are the morphological structures of different leaves?

learning target

1. Try making freehand slices of the leaves.

2. Identify the structure of the blade.

3. Name the structural characteristics of leaves that are suitable for photosynthesis.

Photosynthesis PPT, Part 2: Exploration Topic 1

Observe the structure of the leaves

1. Composition of leaves

think:

What are the characteristics of the way leaves are attached to stems? What is the relationship between the arrangement of two adjacent leaves? What is the relationship between this arrangement and photosynthesis?

Purpose requirements:

1. Practice making freehand slices

2. Understand the structure of blades

3. Draw the epidermal cells of the leaves

Materials and tools: (omitted)

Method steps:

1. Make temporary slices of leaves;

2. Observe the structure of the leaves;

3. Observe the lower epidermis of the leaves.

Photosynthesis PPT, Part 3: Exploring Topic 2

The structure of leaves under a microscope

discuss

1. Why do we need to make very thin temporary slices to observe the cross-section structure of leaves?

2. In which cells of the leaf structure are there green granular structures?

3. What are the characteristics of the distribution of green particle structures in leaves?

Functions of each part of the blade

1. Epidermis

The outer wall has a cuticle that prevents water from evaporating

Epidermal cells are colorless and transparent, which is conducive to the penetration of sunlight

There are guard cells between epidermal cells, which can control the opening and closing of stomata.

(Stomata are windows for gas exchange and portals for water evaporation)

2. Mesophyll

Palisade tissue: close to the upper epidermis, containing more chloroplasts

Spongy tissue: close to the lower epidermis and contains fewer chloroplasts

3.Leaf veins

Conduit: A pipe that transports water and inorganic salts

Sieve tubes: tubes for transporting organic matter

Photosynthesis PPT, Part 4: Training to meet standards

1. When making temporary pieces of leaf cross-section, the correct method of cutting leaves is ( )

A. Cut quickly and in one go B. cut slowly

C. Cut back and forth quickly D. Slowly pull back and forth

2. The following are several method steps for observing blade structure experiments. The correct order is ( )

①Place the fresh leaves flatly on a small wooden board

② Rapidly cut blades laterally

③Pinch the two blades side by side with your right hand

④Choose the thinnest piece to make a temporary mounting piece

⑤Put the flakes existing in the gap between the blades into the water

A. ⑤④③②① B. ①⑤④③②

C. ①②④⑤③ D. ①③②⑤④

3. The general characteristics of leaf epidermal cells are ( )

A. The cells are colorless and transparent, with a cuticle on the outer wall

B． Cells are half-moon shaped and contain chloroplasts

C. Cells are square and closely arranged

D. Cells are cylindrical with chloroplasts inside

4. Observe the cross section of broad bean leaves under the microscope and see that the characteristics of the palisade tissue are ( )

A. The cells are round, not tightly arranged, and contain more chloroplasts

B． Cells are cylindrical, closely arranged, and contain more chloroplasts

C. The cells are irregular in shape, tightly arranged, and contain few chloroplasts.

D. Cells are wavy, tightly arranged, and contain no chloroplasts

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Update Time: 2024-07-30

This template belongs to biology courseware Beijing Normal University Edition Seventh Grade Biology Volume 1 industry PPT template

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