Answer:
1) opposite
2) germ cells
3) S phase or interphase (depending on what you have been taught)
Step-by-step explanation:
Active transport pumps stuff against their concentration (from low to high) gradient (using ATP). This direction is opposite to what diffusion does because diffusion moves stuff down their concentration gradient (from high to low).
Germ cells undergo meiosis to make gametes.
For 3, answer can be S phase or interphase (depends on what you have been taught). Interphase is where cell spends 90% of its time. this is where dna doubles due to replication (S phase is a specific phase inside of interphase where DNA actually replicates)