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[单选题]

Most plants need sunlight just ____ they need water.

A.because

B.when

C.as

D.for

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更多“Most plants need sunlight just…”相关的问题

第1题

Plants need green leaves to make food. A plant needs sunlight and carbon dioxide （二氧化碳 ) for making food and it also needs water and salts from the soil to make food too. There are certain cells ( 细胞 ) in the leaves which change carbon dioxide and water into sugar. To do this the cells need energy, which they get from the sunlight.Green leaves make food for the whole plant. A red leaf can make food too because under the red coloring of the leaf there are food-making cells. There are no leaves which are completely yellow, for they can''t make food.The plant makes sugar for its food. In sunlight green leaves make a lot of sugar. The veins ( 叶脉 ) can''t carry all this sugar away, so the leaves change the sugar into starch ( 淀粉 ), which is kept and so stored in the leaves. At night, the starch changes back to sugar. It is then carried away from the leaves. Some of the sugar is used as food by the plant while the rest is stored as starch. In some plants, food is stored in the roots; in others it is stored in the stem and in leaves, fruits and seeds.

1).Which of the following best gives the main idea of this passage? ()

A、How green plants make food

B、How green plants make sugar.C、How green plants get their energy.D、How green plants change sugar into starch.

2).The cells in the green leaves can get the most energy when ()

A、it is daytime

B、it is night

C、it is sunny

D、it is rainy

3).Food is stored in roots or stems in the form of()

A、sugar

B、starch

C、water and salts

D、carbon dioxide

4).Sugar is made for its food by ()

A、sunlight

B、veins

C、stems

D、green leaves

5).To make food, plants need a lot EXCEPT()

A、the air

B、the soil

C、green leaves

D、it is rainy

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第2题

Plants receive radiant energy from the sun and （) it into chemical energy in the form

Plants receive radiant energy from the sun and () it into chemical energy in the form. of food.

A、divide

B、convert

C、release

D、convey

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第3题

Plants will emit an increased amount of heat when they are_________A.sprayed with pestici

Plants will emit an increased amount of heat when they are_________

A.sprayed with pesticides

B.in pour physical condition

C.facing an infrared scanner

D.exposed to excessive sun rays

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第4题

All the useful energy at the surface of the earth comes from the activity of the sun. The

sun heats and feeds creatures and mankind. Each year it provides men with two hundred million tons of grain and nearly ten million tons of wood.

Coal, oil, natural gas, and all other fuels are stored energy from the sun. Some was collected by this season's plants as carbon compounds. Some was stored by plants and trees ages ago. Even waterpower derives from the sun. Water turned into vapor by the sun falls as rain. It courses down the mountains and is converted to electric power. Light transmits only the energy that comes from the sun's outer layer, and much of this energy that is directed towards the earth never arrives. About nine tenths of it is absorbed by the atmosphere of the earth. In fact, the earth itself gets only one half millionth of the sun's entire output of radiant energy.

The sun is the source of all of the following EXCEPT______.

A．gasoline

B．natural gas

C．atomic power

D．animal fat

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第5题

most of australia’s unique plants and animals are imported from other continents. （)

most of australia’s unique plants and animals are imported from other continents. ()

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第6题

Most remains of animals and plants on land can not survive because of ______.A．bad weather

Most remains of animals and plants on land can not survive because of ______.

A．bad weather

B．sun-ray

C．floods

D．decay

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第7题

Most plants depend upon their roots to （) themselves in the soil and to absorb water and inorganic chemicals

A.anchor

B.reproduce

C.moisten

D.distribute

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第8题

Salty water harms the ability of most plants to take _________water through their root

A.A.for

B.B.up

C.C.in

D.D.on

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第9题

The （) is the most famous of all British papers and the oldest at that.

A.Sun

B.Times

C.Mirror

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第10题

（A Most Forgiving Ape) The author found the area very disturbing because the equator s

(A Most Forgiving Ape) The author found the area very disturbing because the equator sun was beating down him mercilessly.()

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第11题

A typical coal is 10 wt% ash. Most modern power plants grind their coal to an average particle size

of about 100p.lf the ash were uniformly distributed in the coal, what would be the expected size of the remaining ash particles after the coal was burned？ Particles as small as 1μ are regularly found in this ash. Explain how they are probably formed.

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