MCQ
Which one is aquatic weed in the following?
- ATrapa
- ✓Hydrilla
- CEichhornia
- DBoth (b) and (c)
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$(1)$ They have dark colour and high rate of reproduction and excrete solid urine.
$(2)$ They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs.
$(3)$ They feed on dry seeds and do not require drinking water.
$(4)$ They excrete very concentrated urine and do not use water to regulate body temperature.
Which two of the above statements for such animals are true ?
Consumption of which one of the following foods can prevent the kind of blindness associated with vitamin ‘A’ deficiency?
Identify $A$ and $B$ and choose the correct option