Presentation on the topic "seed structure". Presentation for the lesson "seed structure" Safety instructions for laboratory work

slide 3

The seed is the organ of sexual reproduction and plant dispersal.

1. Wheat.

2. Buckwheat

5. Timofeevka

slide 4

The structure of the seed

1. Wheat. 2. Chamomile

3. Lupine

4. Clover

5. Peas

Flowering

plants

monocots

Dicotyledonous

corn, tulip

beans, peas

• 1. Embryonic root

• 2. Embryonic shoot

• Work at the table should be carefully.
• Do not make sudden movements.
• Carefully use a piercing tool (needle). Hold the object with your fingers so as not to prick.
• Keep the workplace in order, do not scatter objects.
• After completing the work, tidy up the workplace.

Lab #4

Subject : The study of the structure of the bean seed.

Target : to study the external and internal structure of the seed of a dicotyledonous plant.

Equipment : magnifying glass, dissecting needle, swollen bean seeds, napkin.

• Consider the appearance of the bean seed, note its shape.
• Find the hilum and the seminiferous inlet.
• Using a dissecting needle, remove the peel from the seed (pre-wet the seed so that it swells).
• Find the germ of the seed. Study its structure. Consider the parts of the embryo: two cotyledons, germinal root, stem, kidney.
• Determine which part of the bean seed contains reserve nutrients.
• Draw a seed and label its parts.
• Make a conclusion.

germinal stalk

germinal root

Peel

cotyledons

• Water: The germ of the seed can only consume nutrients in dissolved form.
• Air oxygen: During seed germination, the embryo breathes intensively, a constant supply of oxygen is required.
• Reserve Nutrients
• Warm: For germination, different plants need different amounts of heat. Plants whose seeds require a high temperature during germination are called heat-loving, and germinating at low temperatures are called cold-resistant.

1.5–2 mm 2–4 cm 4–5 cm

Small seeds Medium seeds Large seeds

Poppy Cucumber Pumpkin

Turnip Carrot Peas

Salad Tomatoes Zucchini

Onion Radish Beans

The value of seeds in nature

The value of seeds in human life

1. Plant propagation

• food product

2. Plant dispersal

A. blown

B. water

B. Animals

G. Self spreading

A. Cereals: wheat, rice, corn, buckwheat, etc.

B. Legumes: peas, beans, soybeans, beans, etc.

B. Oilseeds: sunflower, flax, cotton, peanuts, etc.

G. Tonic: coffee, cocoa

D. spices: pepper, cumin, vanilla

2. Material for selection

Thank you for your work.

The presentation was prepared by a biology teacher MBOU secondary school

r.p. Sura Kazarinova L.V.

The structure of seeds - here is a presentation in front of you, which we use, of course, as always in biology lessons in the sixth grade, because in this age group we teach plants in botany lessons. Biology is very informative, interesting, but for teachers, it is also work with younger students, who are still difficult to keep their attention on studying the subject. And this is due not to the unwillingness to study, but to high mobility at this age. So, in the biology lesson, you need to bring such materials that will be able to attract attention. And we know that such materials are 6th grade biology presentations in the format microsoft powerpoint.

topic Seeds - Grade 6 Biology” width=”480″ height=”360″ class=”aligncenter size-full wp-image-3810″ />
The issues of biology, especially in the lower grades, must be analyzed in great detail, while, as in any lessons, the teacher sets the task of conscious understanding of the material by the students. This can be achieved if the students themselves actively participate in the educational process. And this suggests that they need to be involved in the work. But children get tired of constantly writing in notebooks, so let them work with powerpoint presentation tests, you can download it for free, especially since you can easily download it here.
And the World of Biology - our site, is trying to help you with this. Fortunately, our colleagues help us very well by sending us their developments, because the creation of the site, promotion and promotion takes us a lot of time. The world of biology is a free Internet resource with free materials for biology teachers, where not only a teacher, student or student, but anyone can download powerpoint presentations!

Why do teachers use presentations in 6th grade biology lessons?

The point here is not only in the sixth grade, because such developments can be brought and shown in lessons in any grade. It’s just that sixth graders are such a mobile and restless people that the teacher has to resort to many ways to motivate and attract attention, and one of these ways is to demonstrate a presentation on grade 6 biology on the topic of the lesson.

• Presentation, computer, projector, interactive whiteboard - all this is interesting for children, and they perceive such a lesson enthusiastically
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And for all this, the need to download and use additional materials from a biology teacher will always be.

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Slides captions:

Seed, its structure and meaning

The purpose of the lesson: To study the structural features of seeds, their significance. House. task: - learn item 5; - a message, or make a crossword puzzle on the topic "Seed" (minimum 10 words)

Variety of seeds Lady's slipper Poppy seeds. 6-11 thousand seeds weigh 3-5 g

Seychellois palm seeds. Weight of one seed -15-25 kg

Fruits and seeds of the carob tree Seeds of the carob tree. The weight of one seed is 200 milligrams. carob fruit

Variety of seeds

Marigold Asters Petunia

Laboratory work Topic: The study of the structure of seeds. signs of beans wheat Peel Cotyledons (how many) Supply of nutrients (where located) Germ (structure)

The structure of the bean seed

The structure of a grain of wheat

Laboratory work Topic: The study of the structure of seeds. signs beans wheat Peel Cotyledons (how many) 2 1 Nutrient supply (where located) In the cotyledons In the endosperm Embryo (structure) Embryonic root, germinal stalk, 2 cotyledons Germinal root, germinal stalk, 1 cotyledon

seed germination

Believe it or not 1. In the bean seed, the cotyledons have the largest mass. 2. All seeds have two cotyledons and an endosperm. 3. The structure of the seeds of all dicotyledonous plants is the same. 4. The root appears first in the seedling. 5. A young plant is called a sprout. 6. Outside, the seeds are covered with bark. 7. Through the seed entrance, water enters the seed. 8. Seeds of plants with one cotyledon are called dicots. 1 2 3 4 5 6 7 8 + - + + - - + -

Fill in the missing words The embryo of the seed of a monocot plant consists of … …, … … and … …. The embryo of the seed of a monocotyledonous plant consists of an embryonic root, an embryonic shoot and one cotyledon. Dicotyledonous plants are called, in the seed of which ... Dicotyledonous plants are called, in the seed of which there are two cotyledons.