Question

1.The guard cells control the opening and closing of _______.
2.The red colour pigment that helps to transport oxygen is called _______.
3.Plants breathe through _______ and ________.
4.Human muscles produce ________ when breathing anaerobically.​

Answer 1

Answer:

1) stomata

2) haemoglobin

3) leaf and roots

4 lactic acid

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