"The Life of Plants" PPT courseware

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"The Life of Plants" PPT courseware

Part One: Structure of Seeds

Structure of Phaseolus vulgaris seeds

Germ - will develop into stems and leaves

Hypocotyl - the part that will develop into the root and stem.

Radicle - will develop into root

Cotyledons - two pieces, thick, storing nutrients.

Seed Coat – Tough, protects the seed and internal structure. On the seed coat on the sunken side, there is a hilum and a seed hole.

The embryo is the larvae of a new generation of plants, and the new generation of plants develops from various parts of the embryo.

The structure of corn seeds

Peel and seed coat: The two are tightly together and cannot be easily separated, protecting the inside of the seed.

Endosperm: stores nutrients

Cotyledons: one piece, not thick. When the seed germinates, it transfers the nutrients in the endosperm to the embryo, hypocotyl, and radicle.

Germ: will develop into stems and leaves.

Hypocotyl: The part that will develop into the root and stem.

Radicle: will develop into root.

Embryos are the larvae of a new generation of plants

Life of Plants PPT, Part 2: Classification of Plants

Depending on whether there is endosperm in the seed

Seeds with endosperm:

Rice, wheat, corn, sorghum, castor, persimmon

Endosperm-free seeds:

Soybeans, peanuts, cucumbers, beans

According to the number of leaves in the seed

Monocotyledonous plants:

Rice, wheat, corn, sorghum, sugarcane

Dicotyledonous plants:

Soybeans, peanuts, pumpkin

Dicotyledons: Plants whose seeds have two cotyledons;

Monocots: Plants whose seeds have one cotyledon.

Life of Plants PPT, Part 3: Thoughts and Discussions

discuss:

1. Why do crops and flowers have to be sown in certain seasons and in moist and loose soil?

2. Seeds will germinate if they meet the conditions for germination. So, how do seeds germinate?

think:

After the seedlings grow, the cotyledons in pea seeds and the endosperm in wheat seeds will shrink or even disappear. Do you know what role they play in seed germination?

discuss:

1. What may be the reason why soybean seeds do not germinate when the external conditions are met?

2. How do soybean seeds germinate in fertile, moist and soft soil and in barren, moist and soft soil?

Life of Plants PPT, Part 4: Practice

1. What are beautiful flowers made of? ( )

A. Flower buds B. Stamens C. Branches D. Leaf buds

2. According to the location of the buds, the buds can be divided into ( )

A. Leaf buds and flower buds B. Terminal buds and lateral buds

C. Leaf buds and mixed buds D. Side buds and flower buds

3. The function of the growth point of branch buds is ( )

A. Lateral buds grow. B. Young leaves grow.

C. Elongate the bud axis D. Develop into a stem

4. Are the lateral buds of branches developed from ( )?

A. Leaf primordium B. Growth point C. Bud primordium D. Bud axis

Life of a plant PPT, Part 5: Growth period of a plant

How are the life cycles of plants and animals similar, and what do they mean?

Plants and animals go through growth stages such as birth, growth and development, reproduction, and death throughout their lives.

This similarity shows that the life cycle is the common trajectory of the life movement of all living things and the basis for the continuation of life.

Keywords: Zhejiang Education Edition seventh grade science PPT courseware for the second volume free download, plant life PPT download, .PPT format;

For more information about the "Life of a Plant" PPT courseware, please click on the "Life of a Plant" ppt tag.

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Update Time: 2024-11-24

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 2 industry PPT template

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