组别 | ① | ② | ③ | ④ |
处理条件 | 每组30粒结构完整的绿豆,分别按下列条件处理后放置10天 | |||
25℃,纱布湿润,瓶口敞开 | 0℃,纱布湿润,瓶口敞开 | 25℃,纱布干燥,瓶口敞开 | 25℃,纱布湿润,瓶口密封 | |
种子萌发数 | 26 | 0 | 0 | 3 |
A.②组与①组对照说明种子萌发需要适宜的温度 |
B.③组与①组对照说明种子萌发需要适量的水分 |
C.①组与其它三组对照说明种子萌发的最适温度是25℃ |
D.④组与①组对照说明种子萌发需要充足的空气 |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2