"Growth of Nutritional Organs" PPT

Description

"Growth of Nutritional Organs" PPT

Part One: Situation Import

The germination of seeds and the formation of seedlings mark the stage of plant growth into vegetative organs. How do the roots, stems and leaves of green plants grow from small to large?

learning target

1. Understand which are vegetative organs; describe the occurrence and growth process of roots.

2. Observe the structure of the root tip and explain the development of the root tip.

3. Clarify the occurrence and growth of leaves and stems.

Growth of vegetative organs PPT, part 2 content: course exploration

Explore theme one

Cell division and differentiation at the root tip enable root growth

How does the radicle grow and form a root system?

Root initiation and growth begins with the germination of seeds. When a seed germinates, the radicle is always the first to break through the seed coat and quickly elongate downwards, gradually forming a root system.

1. Tap root system

A root system with obvious differences between main roots and lateral roots is called a tap root system.

2. Fibrous root system

The root system mainly composed of adventitious roots is called fibrous root system.

3. The rules of root distribution:

Geotropism Hydrotropism Fertilizer

4. The structure of the root tip:

Activity: Observe the structure of the root tip

Mature zone: the main part that absorbs water and inorganic salts

Elongation zone: the place where the fastest elongation occurs

Meristematic zone: division to produce new cells

Root crown: protects the meristematic zone

Explore theme two

Cell division and differentiation in leaf buds enables the growth of stems and leaves

1. Types of buds:

2. Observe the structure of leaf buds

3. Growth of leaf buds

PPT on the growth of nutritional organs, part three: training to meet standards

1. The characteristics of fibrous root system are ( )

A． There is a clear difference between main roots and lateral roots

B. No main root, composed of lateral roots

C． Consists of indistinguishable main roots and lateral roots

D. The taproot is underdeveloped and mainly consists of adventitious roots.

2. Which of the following statements about main roots and lateral roots is correct ( )

A． The main root grows downward and is connected to the stem; lateral roots are roots that grow from the main root

B. The root developed from the radicle in the seed is called lateral root; the root connected to the stem is called taproot.

C． All plants have well-developed main roots and undeveloped lateral roots.

D. The root that grows vertically downward is the main root; the root that grows horizontally is the lateral root.

3. According to the position of insertion, 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

4. Buds that can develop into branches, leaves, and flowers are called ( )

A. Terminal bud B. Flower bud C. Leaf bud D. Mixed bud

5. The function of the growing point of leaf buds is ( )

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

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

6. The lateral buds of the branches develop from ( ).

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

Keywords: Beijing Normal University version of the seventh grade biology PPT courseware for free download, the growth of nutritional organs PPT download, .PPT format;

For more information about the PPT courseware "The Life History of Green Flowering Plants and the Growth of the Vegetative Organs", please click the "The Life History of Green Flowering Plants ppt Growth of the Vegetative Organs" ppt tag.

"Growth of Nutritional Organs" PPT courseware:

The first part of the PPT courseware "Growth of Vegetative Organs" content: The occurrence and growth of roots. How does the radicle grow and form the root system? The occurrence and growth of roots begin with the germination of seeds. When a seed germinates, the radicle is always the first to break through. The seed coat quickly extends downward and gradually forms roots.

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Update Time: 2024-10-02

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

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