Option “4” is correct Milk contains a sugar called lactose. It also contains harmless bacteria called lactobacillus, which uses lactose for energy and creates lactic acid as a by-product. It is the lactic acid which makes milk taste sour.
832. Which non-flowering, spore bearing plants have roots?
1. Mustard
2. Angiosperms
3. Ferns
4. Gymnosperms
Option “3” is correct Ferns are non-flowering, deciduous or evergreen perennial plants that grow in various sizes having roots. The fern’s life cycle continues when spores germinate in sunlit, moist environments.
833. Which is the largest living bird on Earth?
1. Emu
2. Ostrich
3. Albatross
4. Siberian crane
Option “2” is correct
The Ostrich is the largest living species of bird in the world. It is unique in its appearance, with a long neck and legs and it can run at maximum speeds of about 70 km/h or 43 mph.
834. Blood groups were discovered by –
1. Almann
2. Landsteiner
3. Losch
4. Ronald Ross
Option “2” is correct Blood groups were discovered by Karl Landsteiner.
835. Transport of oxygen by blood takes place with the help of –
