Which of the following organisms has white blood?

1. A

   Lizard

   (a) Lizard. Reptile blood is red with haemoglobin in erythrocytes. Not ‘white blood’ in the school sense.

2. B

   Cockroach

   (b) Cockroach. Insect haemolymph lacks haemoglobin and appears colourless to whitish (plasma with haemocytes). That is the official key in this four-option set.

3. C

   House bug

   (c) House bug. Also an insect, but the stored key is cockroach, the NCERT-type example.

4. D

   Mosquito

   (d) Mosquito. Haemolymph is similarly pale, yet the keyed organism is cockroach, not mosquito.

Summary. Official key is (b) Cockroach. Textbook ‘white blood’ is cockroach haemolymph without haemoglobin. Lizard blood is red. Honour the stored letter (b).