Which of the following is mainly produced by the activity of anaerobic bacteria on sewage?
1. Propane
2. Mustard gas
3. Marsh gas
4. Laughing gas
1. Propane
2. Mustard gas
3. Marsh gas
4. Laughing gas
Two friends are eating together at a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of:
| 1. | diaphragm | 2. | neck |
| 3. | tongue | 4. | epiglottis |
The figure given below shows a small part of the human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function?
| 1. | A – Alveolar cavity – main site of exchange of respiratory gases |
| 2. | D – Capillary wall – exchange of O2 and CO2 takes place here |
| 3. | B – Red blood cell – transport of CO2 mainly. |
| 4. | C – Arterial capillary – passes oxygen to tissues |
If for some reason, the vasa efferentia in the human reproductive system get blocked, the gametes will not be transported from:
1. epididymis to vas deferens
2. ovary to uterus
3. vagina to uterus
4. testis to epididymis
1. Rhizobium
2. Frankia
3. Anabaena
4. Glomus
1. mangroves
2. tropical rainforests
3. alpine forests
4. temperate forests
1. bronchioles and fallopian tubes
2. bile duct and oesophagus
3. fallopian tubes and urethra
4. eustachian tube and stomach lining
1. Type AB
2. Type O
3. Type A
4. Type B
1. Tubectomy
2. Diaphragms
3. IUDs (Intra Uterine Devices)
4. Cervical caps
| 1. | secondary growth | 2. | disease resistance |
| 3. | reproduction | 4. | conserving water |
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