"Growth and Change of Plants" Growth and Change PPT Courseware 2

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"Growth and Change of Plants" Growth and Change PPT Courseware 2

Plant groups:

Algae, bryophytes, ferns, gymnosperms, angiosperms

Angiosperms (green flowering plants):

It is composed of six major organs, which are roots, stems, leaves, flowers, fruits, and seeds. Among them, roots, stems, and leaves are also called vegetative organs, and flowers, fruits, and seeds are also called reproductive organs.

Conditions for seed germination:

Internal Condition: Nutritious, whole, alive.

External conditions: suitable temperature, suitable moisture, and sufficient air.

root:

Function: Fixed plant body absorbs water and inorganic salts

Structure: Root tip - about 1 mm, the part where the root grows and absorbs water and inorganic salts.

The part above the root tip - fixes the plant body and transports water and inorganic salts.

Root system: The total number of roots of a plant.

Tap root system - dicotyledonous plants

Fibrous root system - monocots

Flower according to structure Complete flower

not quite flower

Pollination: The process of pollen falling from the anthers of the stamen to the stigma of the pistil is called pollination. There are two methods of self-pollination and cross-pollination.

Flowers are pollinated according to the way they are pollinated. Wind-pollinated flowers - no fragrance, small or no petals, many and light pollen grains, and large pistil stigmas.

Insect-pollinated flowers - have fragrance or odor, some have nectaries, and some have large and bright flowers that easily attract insects for pollination.

Structure of pistil:

One sperm + one egg cell → one fertilized egg

One sperm + two polar nuclei → one fertilization polar nucleus

Human life cycle:

Birth - Development - Reproduction - Death

In fact, human life begins from the moment a fertilized egg is formed. Then there is his development, including two processes: development inside the mother and development outside the mother.

Development within the mother: fertilized egg → embryo → fetus → mature fetus, delivery.

Development outside the mother's body: infancy (one year old), pre-infancy (1-3 years old), early childhood (3-6 years old), childhood (6-9 years old), adolescence (9-18 years old), of which the period experienced during adolescence The longest period of time. During this period, not only do people's height and weight change significantly, but their brain, heart, and lungs also develop rapidly. At the same time, their sexual organs begin to develop, and their sexual functions gradually mature. There have also been some psychological changes. Development during this period has the greatest impact on a person’s life.

Insect life cycle:

Birth - Development - Reproduction - Death

Take silkworm as an example:

The development of insects goes through four stages: fertilized egg, larvae, pupa, and adult. There are obvious differences in morphological structure and living habits between larvae and adults. This development process is called complete metamorphosis.

Development of locusts:

The development of insects goes through three stages: fertilized egg, larvae, and adults, and the larvae and adults are basically similar in morphological structure and life habits. This development process is called incomplete metamorphosis.

Amphibian life cycle:

Take frog for example

Fertilized eggs, tadpoles, young frogs, and adult frogs. Compared with tadpoles, adult frogs have significant changes in morphological structure and life habits. Their development is also called complete metamorphosis.

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Update Time: 2024-11-22

This template belongs to science courseware People's Education Press Fifth Grade Science Volume 2 industry PPT template

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