Presentation on leaf and its structure. Presentation for the lesson "Leaf - the organ of a plant" presentation for a lesson in biology (grade 6) on the topic

reservoirs 30.06.2020

reservoirs

The external structure of the leaf Completed Akimova N.A. Teacher of biology and chemistry, Voloshovskaya secondary school

Answers to the test Option 1 A 1 - 3 A 2 - 2 A 3 - 1 A 4 - 1 Option 2 A 1 - 4 A 2 - 2 A 3 - 3 A 4 - 3

Are all leaves the same in appearance? How are the leaves different from each other? What is common in their structure?

What does life on earth depend on? Why do plants have such a powerful huge crown?

What are the main functions of a sheet? evaporation photosynthesis respiration

leaf structure leaf blade petiole leaf base

petiolate leaf

Leaf sessile

Leaf blade shapes 1. Broadly ovate leaf 2. Rounded 3. Reversely broadly ovate 4. Ovate 5. Elliptical 6. Obovate 7. Narrowly ovate 8. Lanceolate 9. Oblong 10. Reverse narrowly ovate 11. Linear

Blade edge shape

simple leaves compound leaves

Types of leaf venation Veins - conductive bundles of leaves

Plant features dicotyledonous monocotyledonous number of cotyledons two one root system rod fibrous leaf venation reticulate arc, parallel

Exception Plantain Crow's Eye

plant name leaves simple or compound Venation leaf arrangement dicotyledonous or monocotyledonous Laboratory work “Leaves are simple and compound, their venation and leaf arrangement”

Line 1 - one noun expressing the main theme of the syncwine. Line 2 - two adjectives expressing the main idea. Line 3 - three verbs describing actions within the topic. Line 4 - a phrase that carries a certain meaning. Line 5 - conclusion in the form of a noun (association with the first word). cinquain

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Slides captions:

P Topic: "External structure of the leaf" Prepared by: teacher of biology at MBOU "Romodanovskaya secondary school No. 2" Elizarova Lidia Nikolaevna

Lesson objectives: 1. Introduce the variety of leaves, develop morphological concepts. 2. Develop the ability to make comparisons, draw conclusions, identify common and distinctive features of simple and complex leaves.

Problem task The leaves of different plants are not similar to each other. Some plants have large leaves, while others are very tiny. Victoria regia - leaf diameter 2.2 m Duckweed has the smallest floating leaves Raffia palm has a leaf length of 20 m

Hypothesis: The leaves of different plants have similar and distinctive features.

Task number 1 1. Consider the figure "External leaf structure." Learn what are the main parts of the sheet. 2. Find the main parts of the leaf on the herbarium. 3. Do all leaves have a petiole? Check out the drawings in the app. What are these leaves called? 3. Complete task 33 in the workbook. 4. Make a conclusion.

Conclusion: The leaf consists of a leaf blade with veins and a base. Leaves can be petiolate or sessile.

Task number 2 1. Using knowledge about the external structure of the leaf, compare the herbarium leaves under No. 1 and No. 2. What is the difference? 2. Find in the application the definition of "simple leaves", "complex leaves". 3. Complete exercise 36 in the workbook. 4. Draw a conclusion.

Conclusion: A leaf consisting of one leaf blade and one petiole is called simple. A leaf consisting of several leaf blades connected to a common stalk by small petioles is called a compound leaf.

Leaf variety

Task number 3 Get to know the forms of the leaf blade of simple and complex leaves. 2. Answer the questions: 1) What is the shape of the leaf blade typical for simple leaves? 2) What shape of the leaf blade is typical for compound leaves? 3. Determine the shape of the leaf blade in the leaves of herbarium No. 1 and No. 2. Write down in a notebook.

Conclusion: Plants differ from each other in different forms of leaf blades, which is important for plant identification.

Task number 4 1. Look at the picture. 2. What types of venation are distinguished? 3. Fill in the diagram: (in a notebook) Type of venation 4. Determine the type of venation of the leaves of herbarium No. 1 and No. 2. Write down in a notebook. 5. Draw a conclusion.

Venation type Pinnate

In conclusion: The following types of venation are distinguished: parallel, reticulate (fingered, pinnate), arcuate. This is an important feature in the identification of plants.

The leaves of different plants have similarities in external structure. Leaves have distinctive features that help identify plants by species.

Leaf Functions 1) The leaf provides light capture. 2) List ensures the formation of organic substances. 3) The leaf provides breath. 4) The leaf evaporates water, protecting plants from overheating. 5) The leaf can provide protection (modified spiny leaves have this role).

Thank you very much for your attention

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Slides captions:

LEAF - PART OF ESCAPE. EXTERNAL AND INTERNAL STRUCTURE OF THE LEAF. TYPES OF LEAVES. Eremkina E.V. - teacher of biology, secondary school No. 3, Volsk, Saratov region.

A LEAF IS ONE OF THE MAIN ORGANS OF THE PLANT, OCCUPING A LATERAL POSITION IN THE SHOOTS. EXTERNAL STRUCTURE OF THE LEAF: 1 - LEAF PLATE; 2 - VEINS; 3 - PETLE; 4 - stipules; 5 - BASE OF THE SHEETS.

 VEINS - LONG STRIPS OF VASCULAR TISSUE INSIDE THE LEAF. SUPPLY THE LEAF WITH WATER AND MINERALS AND TRANSPORT THE NUTRIENTS PRODUCED IN THE LEAF. INTERNAL STRUCTURE OF THE LEAF

Pinnate and palmate venation - in the leaves of dicotyledonous plants. PARALLEL AND ARC VENTING - IN THE LEAVES OF MANY MONOcotyledons.

 COLUMN (PALICADE LAYER) OF CELLS. LOCATED UNDER THE UPPER SURFACE OF THE LEAF, CONTAINS MANY CHLOROPLASTS. COLUMN CELLS PEEL  OUTSIDE THE LEAF IS COVERED WITH PEEL. SPONGEIC CELLS  SPONGEY LAYER. A LAYER OF CELLS THAT HAVE AN IRREGULAR SHAPE AND FREE SPACES IN WHICH GASES CIRCULATE. MESOPHYLL  ON THE LOWER SURFACE OF THE LEAF - VERY SMALL PAIR GREEN CELLS, BETWEEN THEM - A GAP. STATE - A PAIR OF GUARD CELLS AND INTERCELLULAR GAP. THROUGH THE STATE, GAS EXCHANGE AND MOISTURE EVAPORATION.

PHOTOSYNTHESIS, GAS EXCHANGE AND LEAF FALL ARE THE MOST IMPORTANT FUNCTIONS PERFORMED BY THE GREEN LEAF IN THE LIFE OF PLANTS. THE EXTERNAL AND INTERNAL STRUCTURE OF THE LEAVES IS WELL ADAPTED TO PERFORM THESE FUNCTIONS. WHEN ACQUISITING NEW FUNCTIONS, THE SHEET IS CHANGED. SHEET FUNCTIONS

CHLOROPLASTS ARE ONLY FOUND IN PLANT CELLS. THEIR OUTER MEMBRANE IS SMOOTH, AND THE INTERNAL MEMBRANE FORMS NUMEROUS FOLDS. BETWEEN THEM ARE STACKS OF BUBBLES ASSOCIATED WITH IT, CALLED GRAN. THEY HAVE GRAINS OF CHLOROPHYLL, A GREEN PIGMENT THAT PLAYS THE MAIN ROLE IN THE PROCESS OF PHOTOSYNTHESIS. ATP IS PRODUCED IN CHLOROPLASTS AND PROTEIN SYNTHESIS IS ALSO OCCURRED. 2 1 - STROMAL THILAKOID; 2 - EXTERNAL MEMBRANE; 3 - THILAKOID GRANA; 4 - INTERNAL MEMBRANE. STRUCTURE OF THE CHLOROPLAST CHLOROPLASTS ARE GREEN COLOR. CHROMOPLASTS - RED AND YELLOW. LEUKOPLASTS - UNPAINTED PLANT PARTS.

SIMPLE AND COMPLEX LEAVES: 1 - LILAC; 2 - APPLE TREE; 3 - MAPLE; 4 - CLOVER; 5 - DANDELION; 6 - ROSE HIP; 7 - RASPBERRY; 8 - STRAWBERRY; 9 - LUPIN. THERE ARE MANY SHAPES AND SIZES OF LEAVES, BUT THERE ARE ONLY TWO DIFFERENT TYPES. SIMPLE LEAVES CONSIST OF ONE LEAF PLATE. COMPOUND LEAVES ARE FORMED BY SEVERAL SMALLER LEAF LABEL, CALLED LEAVES, GROWING FROM A SINGLE LEAF STOCK.

TYPES OF COMPOUND LEAVES

LEAF TYPES ACCORDING TO ITS TOP SHAPE

SHEET TYPES BY THE SHAPE OF ITS EDGE

LEAF TYPES ACCORDING TO THE FORM OF ITS LEAF PLATE

SPECIAL LEAVES

On the topic: methodological developments, presentations and notes

Lesson: Root as a plant organ. Types of roots and types of root systems. Meaning and variety of roots.

The purpose of the lesson: to form the concept of the root as a vegetative organ Educational tasks: To create conditions for mastering knowledge about the Types of roots - to be able to recognize the main, adventitious ...

LESSON PLAN A flower is a generative organ of a plant

To deepen students' knowledge about the structure of plant organs, their significance in plant life; The ability to apply knowledge in practice ....

Biology presentation on the topic "External leaf structure."

Explanatory note.

The presentation on the topic “External leaf structure” is an accompanying visual material for a lesson in grade 6 on the topic “External leaf structure”. The developed presentation is focused on the work on the textbook by V.V. Pasechnik "Biology. Diversity of angiosperms”, recommended for pupils of the 6th grade of the basic school. Accompanying material in the form of a lesson summary is attached to the presentation (Appendix 1)

Attachment 1.

The external structure of the leaf.

Target: Contribute to the formation of ideas about the diversity of leaves, create conditions for the formation of the ability to recognize simple and complex leaves, their venation.

Tasks:

Educational: introduce the variety of leaves, the features of their external structure, types of venation; learn to distinguish between simple and compound leaves.

Developing: to continue the formation of skills to work with herbarium material, textbook and notebook; to continue the formation of personal qualities of students: observation, memory training, accuracy when performing tasks, biological speech, methods of mental activity; carry out analysis, synthesis, compare, generalize; formulate conclusions.

Educational: to cultivate an interest in nature, an aesthetic sense.

Planned results of the training session:

Subject:

Know the outer leaf, its role in the life of the plant;

To be able to distinguish between simple and compound leaves, features of reticulate, arcuate and parallel venation

Metasubject:

Regulatory: independently determine the goal of educational activity, look for ways to solve the problem and means to achieve the goal; participate in a collective discussion of the problem, be interested in other people's opinions, express one's own;

Communicative: to form the ability to independently organize educational interaction when working in a group (pair); listen to a friend and justify your opinion; express your thoughts and ideas.

Cognitive: to form the ability to analyze and evaluate information; have the ability to adequately use speech means for discussion and argumentation of their position, to form the ability to build a logical reasoning.

Personal:

Have cognitive interests and motives aimed at studying wildlife; show readiness and ability for self-development and self-education on the basis of motivation for learning and cognition.

Lesson type: learning new material.

DURING THE CLASSES

Org. moment.

Knowledge update

front poll.

What is called an escape?

What is the importance of escaping in plant life?

What is a kidney?

What is the structure of the kidney?

What is the difference between vegetative (leaf) buds and generative (flower) buds?

What causes escape to develop?

1. From the kidney on the shoot appears:

A) root B) sheet; B) a new escape

2. The gaps between the leaves on the shoot are called:

A) knots B) internodes

3. The buds from which shoots with flowers are formed are called:

A) vegetative; B) generative

4. Kidneys are:

A) rudimentary shoot

B) rudimentary leaves

B) modified escape

D) modified leaves

5. The place of attachment of leaves to the shoot is called:

A) knots B) internodes

3. Motivation of educational activity.

(Slide 2) Guess the riddle:

From the kidneys appear

bloom in spring,

rustle in summer,

Autumn - fly (click 1,2,3)

Guys, what are we going to talk about today? (student answers).

Correctly. Let's get acquainted with the structure of the sheet

(Slide 3) Lesson topic. The external structure of the leaf.

Looking at the topic of the lesson, let's determine what you will need to learn in the lesson today.

Exploring a new topic.

(Slide 4)

The leaves are different...

yellow, green, red,

Cirrus, rounded, oval.

Serrated and entire.

And they can be simple and complex,

Sedentary and petiolate.

Other than that, it doesn't matter what...

After all, plants feed on them.

Photosynthesis takes place in the leaves

And he gives organic matter for life!

You are in vain, my friend, do not tear the sheet!

And it is better to teach him the external structure!

The largest leaf of the Amazonian Victoria is up to 1 m. The Victoria leaf is so large that a three-year-old child can sit on it, like on a raft.

The smallest leaf of duckweed has a leaf diameter of 3 mm.

(Slide 5) leaves have a different shape, they all perform three main functions.

(slide 6) (click 1,2,3) leaves evaporate water (click 4,5,6,7,8) take in carbon dioxide and release oxygen during photosynthesis (click 9,10,11,12,13) They exchange gases by taking in oxygen and releasing oxygen.

(slide 7)External leaf structure

Although the leaves of different plants differ greatly in appearance, there are common signs between them:

most of the leaves are green

consist of: (click 1,2)- leaf blade - expanded part of the leaf, (click 3,4) petiole - narrow stem-like part of the leaf, (click 5,6) base of the leaf - the part by which the petiole is attached to the stem, (click 7,8,9) have veins - conducting vessels of the leaf.

(Slide 8) Some plants may have stipules at the base of the petiole.

(click 1) with stipules (click 2) without stipules

(click 3,4) examples

(slide 9) Attaching the leaves to the stem

(click 1) petiolate (click 2) sedentary

(click 3,4,5,6) examples

Sketch the outer structure of the leaf. Sign the main parts.

(Slide 10) What is common in the structure of simple leaves? Define which leaf is called simple? Simple leaves consist of one leaf blade

(slide 11) What is common in the structure of compound leaves? Define which leaf is called complex? Compound leaves consist of several leaf blades and one petiole

Fizkulminutka.

From behind the desks we will go out together

But there's no need to make noise

Stand up straight, feet together

Turn around in place.

Let's clap our hands a couple of times.

And let's dive in a little.

Now imagine, kids

As if our hands are branches.

Let's shake them together

Like a south wind blows

The wind died down. We sighed together

We need to continue the lesson.

Lined up, quietly sat down

And look at the board.

(slide 12) simple and compound leaves have a different shape of the edge of the leaf blade.

(slide 13) (click 1,2,3) leaf blades in different directions are pierced by conductive bundles, which are called veins.

The veins conduct nutrients and water and give the leaf its strength.

(click 4.5) parallel - the veins are parallel to each other (click 6.7) reticulate - veins branch, forming a continuous network (click 8.9) arcuate - the veins are arranged in the form of an arc

(slide 14) among leaves with reticulate venation, (click 1,2) pinnate and

palmate (click 3,4) examples

(slide 15) Laboratory work

"Leaves simple and compound, their venation and leaf arrangement"

The purpose of the work: to get acquainted with the structural features of simple and complex leaves, their venation and types of leaf arrangement

Equipment: herbarium material or slide 16

The progress of work according to the instructions in the textbook on pages 35-36.

Primary consolidation of knowledge.

(slide 17) Denis and Anya need to collect a herbarium. Anya needs to collect plants with only simple leaves, and Denis - with complex leaves? Help the children to assemble the herbarium correctly.

(slide 18) To get to the institute, the researcher needs to photograph several plants with certain types of leaves. Based on the characteristics of these leaves, determine which plants and in what order the researcher will photograph.

The plant has:

Complex leaves.

Simple leaves.

Sitting leaf.

Leaf with stipules.

Leaf with arcuate venation.

(slide 19,20,21,22) In the proposed set of leaves, find one extra. Justify your choice.

Homework.

§ 6. questions on page 36

(slide 23)

Reflection. Summarizing.

There in the forest thickets

Where everything is sweet for the heart ...

Nature has endowed us with mysteries.

For all those who know how to unravel their mystery -

"Thank you for the lesson!" - I say again.

I pull earthly palms from the sun - little rays I collect day by day work doing an important job What is this riddle about?

Lesson topic: “External structure of the leaf. Leaf modifications. Leaf fall.

The purpose of the lesson: to study the external structure of the leaf, the diversity of leaves, the modifications of leaves and their functions, to form an idea of the phenomenon of leaf fall, its significance.