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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.
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