Hard Seed Coat
The hard seed coat can cause dormancy in plants i) By being impermeable to water the impermeability of seed coat to water and oxygen does not allow the seed to germinate. ii) In certain wild plants the hard seed coat acts as a ph..
Seed Germination
Seed Germination - In the life of most flowering plants, 3 distinct phases are seen. i) Seed germination and vegetative growth phase ii) Reproductive phase iii) Senescence and dea..
Seed Germination - In the life of most flowering plants, 3 distinct phases are seen. i) Seed germination and vegetative growth phase ii) Reproductive phase iii) Senescence and dea..Methods of Breaking Seed Dormancy
Microorganisms present in the soil weaken and decompose the hard seed coat. The digestive juices present in the alimentary canal of the fruit eating birds makes the seed coat sof..
Factors affecting Seed Germination
A dormant seed contains 10-15% of water and is generally dehydrated. So the dormant seed has to absorb water to become active and exhibit germination. Water makes the seed coat soft, causes it to rupture after swelling and start germinatio..
Dihybrid Inheritance
It is a cross involving two pairs of contrasting characters. For this experiments on dihybrid inheritance. Mendel selected the contrasting characters in the seed coat and cotyledons. He conducted a cross pollination between a pure breeding plant with round seed h..
Water
A dormant seed contains 10-15% of water and is generally dehydrated. So the dormant seed has to absorb water to become active and exhibit germination. Water makes the seed coat soft, causes it to rupture after swelling and start germination. Water is also nee..
a. Achene
It is simple, dry, indehiscent fruit developing from a superior monolocular ovary with a single ovule. The pericarp is dry, membranous and free from the seed coat. e.g. Mirabili..
c. Cypsela
It is a simple, dry, indehiscent fruit developing from inferior, bicarpellary, syncarpous, monolocular ovary with a single ovule. The pericarp is thin and free from the seed coat, e.g. Helianthu..
Post fertilisation changes:
As a result of fertilisation, the following changes are observed in a flower: 1. A diploid zygote is formed and develops into an embryo which is the future plant. 2. The triploid endosperm tissue serves as a source of nutrition for the developing embryo. 3. The ovule becomes seed. 4. Th..
Embryo Formation
>As the embryo and endosperm mature, the integuments of the ovule becomes hard to form the seed coat, which protects the seed..
>As the embryo and endosperm mature, the integuments of the ovule becomes hard to form the seed coat, which protects the seed..See what our Users say :
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