题干

图一以测定的产氧和耗氧速率为指标,研究温度对某种植物的光合作用与细胞呼吸的影响;图二研究该植物果实中不同浓度的乙烯对呼吸速率的影响。据图分析不正确的是

A:测定光照下产氧速率时,光照是无关变量,因此各温度条件下的光照强度必须相同

B:图一表明呼吸作用相关酶的最适温度高于光合作用相关酶

C:乙烯通过影响酶的活性来影响呼吸速率从而促进果实成熟

D:随着乙烯浓度增大,呼吸峰出现的时间提前,果实催熟时可适当增加乙烯浓度

上一题 下一题 0.0难度 选择题 更新时间:2016-05-09 05:03:19

答案(点此获取答案解析)

C

同类题4

任务型阅读

    What is the easiest way to stay warm in the super cold?____. At least that is what Santa Claus told me.

    During Christmas, Dennis and I went to Finland. We brought back some tips for keeping warm in a cold temperature.

    ⒈There layers(层)work wonders.

    Start with the base layer, which sits right on your skin: choose something that can absorb sweat____A sweater is a good choice. The most important layer is the outer clothes, which should be waterproof(防水的)and windproof.

    ⒉____.

    You lose heat from every millimeter of uncovered skin, which was the biggest lesson I learned on this trip. My whole body was well covered. But I missed one sport: my face. So it often felt like the wind was going to blow my nose off.

    ⒊Exercise, don't just stand still.

    When it's cold, exercising may be the last thing you feel like doing, but be smart.____and you will feel the difference. When we first got to Finland, we were freezing. But after a couple of minutes jumping around, we felt less cold.

    ⒋If you have a heater

    You may want to turn it all the way up, but it's best to keep it at between 18 and 20 degrees____but not create a huge difference between inside and outside.

A. Grow a crazy beard.

B. The key is what your layer is

C. Cover every bit of your skin

D. That will keep you comfortable

E. Take a walk, faster than your normal speed

F. Don't forget to keep your hands and feet warm, too

G. The middle layer keeps your body heat from getting away