Quick on the draw!

?
C P R P F A S Q Y O G B Q N X I U T W R C
C O Q Q X M J L G X P O F J G J M D J N D
Y F M K T D C O M O X M J X F V J V P A L
Q X P R L G B N H X N V L I X P V Q F U F
Y N O V M R P A D M F T Q H N E C I H I A
L O N C E W U H E T D O B P E E X K X U Q
V P I T P X E T V A A X P K R U A Q T M J
M G A F Q G K E D E N D D A V F N D M C P
C W X E F H H O C L U Q Y V N D S S A A M
C T O M P J F I W G X B C A I T N G L I Y
B F F G M M C B I Q G M Y N J I M S S A L
E L E C T R O C H E M I C A L C E L L D P
Q K W J W P Y C D H L K J V U U T E W V O
M M Y K B I O F U E L S S E K P M B I I T
B X F U W L Y G R H D I A D L R O E U I I
U A O U E E W O O T O Q F V H U H M U Q C
U U Q A U P J E J B V F G L R T Y W J O V
B B Q U U B M R P W T T X O G B E K J W M
M T F B E F A P N U V Q T I D B N Q N R G
X U C X E P I W Q P Y D W N X T L S B C D
R D K H C I B A Q N G U N J C N D A Q F H

Clues

  • What is the only by-product of a hydrogen fuel cell? (5)
  • What name do we give to any fuels made from plants and animal waste? (8)
  • What type of biofuel is used mainly in Brazil and the USA? (10)
  • Which cell uses chemical reactions to produce electricity? (15, 4)

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