What is the significance of seeds?

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What is the significance of seeds?

Seeds are of immense biological and economic importance. They contain high protein, starch and oil reserves that help in the early stages of growth and development in a plant. These reserves are what make many cereals and legumes major food sources for a large proportion of the world?s inhabitants.

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Why are seeds an evolutionary advantage for seed plants?

Seeds allow for the transport of water and nutrients. Seeds develop into adults without sexual reproduction. Seeds protect and nourish young, growing plants.

What is the evolutionary significance of the fruit?

The origin of the fruit is an evolutionary adaptation that facilitates survival and distribution of progeny. For example, fruits protect the developing seeds from adverse environments and/or foraging by animals during premature stages, thus enhancing the survival rate.

When did seeds evolve?

about one million years ago
Seed plants appeared about one million years ago, during the Carboniferous period.

Why are seeds important to humans?

The importance of seeds is biological and economic. They have large amounts of protein, starch, and oil, which are all important nutrients for the development of plants and humans. They are used in the production of many primary food sources for humans.

What is the evolutionary advantage of flowers?

Angiosperms have vascular bundles, allowing them to grow taller and shade out undergrowth. They are also able to produce spores, which are more stable structures than gymnosperm seeds.

Why are seeds evolutionarily more successful than spores?

Having an embryo already grown gives a seed plant a better chance at survival as opposed to a spore. The single cell of the spore must undergo a cell division and specialization process before the plant or fungus can really begin to grow.

Why is a cucumber a Pepo?

A fleshy, several-seeded fruit that has developed from one flower having a single ovary divided into several carpels, which develops a firm or tough rind as it matures (such as a melon, squash, cucumber).

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What are the three steps in the evolution of seed?

The review will be divided into sections dealing with: (1) the development and anatomy of seeds; (2) the endosperm; (3) dormancy; (4) early seed-like structures and the transition to seeds; and (5) the evolution of seed size (mass). In many cases, a special distinction is made between angiosperm and gymnosperm seeds.

Why are seeds important to the evolution of plants?

Seeds therefore allow plants to disperse the next generation through both space and time. With such evolutionary advantages, seed plants have become the most successful and familiar group of plants. Both adaptations expanded the colonization of land begun by the bryophytes and their ancestors.

How is the evolution of seed plants related to evolution of gametophyte?

In seed plants, the evolutionary trend led to a dominant sporophyte generation accompanied by a corresponding reduction in the size of the gametophyte from a conspicuous structure to a microscopic cluster of cells enclosed in the tissues of the sporophyte.

How are seeds and pollen important to plants?

The evolution of seeds allowed plants to reproduce independently of water; pollen allows them to disperse their gametes great distances. Plants are used for food, textiles, medicines, building materials, and many other products that are important to humans.

How are seeds different from seedless vascular plants?

Both seeds and pollen distinguish seed plants from seedless vascular plants. These innovative structures allowed seed plants to reduce or eliminate their dependence on water for gamete fertilization and development of the embryo, and to conquer dry land.

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What is the significance of section 109 of the Constitution?

Section 109 of the Australian Constitution provides that: ?when a law of a State is inconsistent with a law of the Commonwealth, the latter shall prevail, and the former shall, to the extent of the inconsistency, be invalid?.

Why do you think Section 109 was written into the Australian Constitution?

Section 109 of the Australian Constitution was written to sort out what happens when a law of the Commonwealth and a State conflict. Laws which have ?no effect? are still laws, but cannot be used ? whereas a law found invalid under Section 109 of the Australian Constitution is invalid and no longer a law.

Does s 109 of the Constitution prevent state parliaments imposing obligations on individuals which are more onerous than Commonwealth legislation?

There is nothing in the terms of s 109 which prevents the Commonwealth from enacting such a law. A Commonwealth law conferring immunity from an obligation imposed by State law is a ?law?.

What happens in the circumstance where federal law conflicts with a state law refer to section 109 of the Australian Constitution?

Section 109 of the Constitution says that when a federal law is inconsistent with (or conflicts with) a state law, the Commonwealth law will prevail, and the state law will be invalid. In order to have a state law declared invalid, it must be found to be inconsistent by the High Court of Australia.

What does the Constitution say about states rights?

The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

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What is the effect of section 107 of the Constitution?

As s 107 gives the states a general legislative power unlimited as to subject matter, the combined effect of the two provisions is to reserve power over trade within a state exclusively to the state concerned.

Can laws override the Constitution?

Article VI, Paragraph 2 of the U.S. Constitution is commonly referred to as the Supremacy Clause. It establishes that the federal constitution, and federal law generally, take precedence over state laws, and even state constitutions.

Is federal and commonwealth the same thing?

This infosheet is about the national or central government, usually called the Federal Government, Commonwealth Government or Australian Government. However, state and territory governments are also based on the same principle of parliamentary government.

What happens if a state law conflicts with the Constitution?

When state law and federal law conflict, federal law displaces, or preempts, state law, due to the Supremacy Clause of the Constitution.

Can states make laws that go against the Constitution?

State or local laws held to be preempted by federal law are void not because they contravene any provision of the Constitution, but rather because they con?ict with a federal statute or treaty, and through operation of the Supremacy Clause.

What does Section 109 of the constitution say?

S.109 of the Constitution 6. Section 109 expresses the supremacy of any ?law of the Commonwealth? over any ?law of a State?. ?When a law of a State is inconsistent with a law of the Commonwealth, the latter shall prevail, and the former shall, to the extent of the inconsistency, be invalid?.

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What happens when S 109 goes into effect?

When s 109 takes effect, the State law yields to the Commonwealth law, but remains a valid law of the Parliament which enacted it. The practical significance of this will become apparent if, at some later date, the overriding Commonwealth law ceases to operate.

What are the tests of inconsistency in Section 109?

The Tests Used by the High Court Section 109 provides that3 ?[wlhen a law of a State is inconsistent with a law of the Commonwealth, the latter shall prevail, and the former shall, to the extent of the inconsistency, be invalid?.

When does s.109 render a state law invalid?

If an inconsistency occurs because of prospective or retrospective operation of federal or State law, s.109 operates to render the State law invalid to the extent of the inconsistency. But retrospective operation of federal law cannot render valid what s.109 made invalid. This would elevate legislation above the Constitution.

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