更多"Plants with roots appeared about __"的相关试题:
[单项选择]Plants with roots appeared about ______ million years ago.
A. 430
B. 300
C. 330
D. 100
[单项选择]Roots of plants tend to grow downward into soil, unless-----more readily available at the surface.
A. have water
B. water has
C. is water
D. water is
[单项选择]______ about wild plants that they decided to make a trip to Madagascar for further research.
A. So curious the couple was
B. So curious were the couple
C. How curious the couple were
D. The couple was such curious
[单项选择]About how many dogs and cats are destroyed each year
A. 6 million.
B. 15 million.
C. 30 million.
D. 1 million.
[单项选择]How is food for plants made Food for plants is made ______.
A. from water
B. from the air in the sky
C. from the soil
D. from water, things in the soil and air and sunlight
[单项选择]Roots have the ability to ()
A. make proteins
B. obtain fresh air
C. produce inorganic nitrogen
D. carry out activities without energy
[单项选择]People cannot survive without plants.
[单项选择]The scientists found what the isolated roots need is ()
A. quite natural
B. sugar, minerals and vitamins
C. some rare vitamins
D. organic nitrogen compounds
[单项选择]
Liquorice Consists of the dried,unpeded roots and stolns,and contains not less than 4.0% of glycyrrhizinic acid.Which of the following is true()
A. 除去外皮的根
B. 除去外皮的根茎
C. 潮湿的根茎
D. 不少于4.0%的甘草酸
E. 低于4.0%的甘草酸
[单项选择]Researchers discovered that plants infected with a virus give off a gas that ______ disease resistance in neighboring plants.
A. contracts
B. activates
C. maintains
D. prescribe
[单项选择]Scientists have traditionally (classified) plants by (grouping them) according to similarities in their overall (appear), their internal structure, and the form of their (reproductive) organs.
A. classified
B. grouping them
C. appear
D. reproductive
[单项选择]The roots of the plant transmit the moisture and _________ to the trunk and branch.
A. nutritive
B. nutrients
C. nutritious
D. nutrition
[单项选择]Research discovered that plants infected with a virus give off a gas that______ disease resistance in neighboring plants.
A. contracts
B. activates
C. maintains
D. prescribes
[单项选择]Plants can absorb the carbon dioxide through their ______ during the sunlight hours and produce oxygen which human beings need to survive.
A. slots
B. hoses
C. pores
D. sponges
[单项选择]What has sometimes caused plants to die out
A. Interference from foresters.
B. Variations in climate.
C. The absence of wooded land.
D. The introduction of new type of plants.