Give reasons:- 2x4=8
a) Girls need to consume food rich in iron.
b) Cell membrane is porous.
c) Forests are important to avoid floods and droughts.
d) It is dangerous to burn coal in a room where people are sleeping.
Answers
Answer:
a) Girls need to consume food rich in iron.
Iron is a mineral that works with other substances to create haemoglobin, the compound that carries oxygen in the blood.
Women and men metabolise iron from food at roughly the same rate.
However, while men need around 8 mg of iron in their daily diet, women need up to 18 mg (or 27 mg if pregnant).
b) Cell membrane is porous.
The outer membrane typically has a porous quality due to its presence of membrane proteins, such as gram-negative porins, which are pore-forming proteins.
The inner, plasma membrane is also generally symmetric whereas the outer membrane is asymmetric because of proteins such as the aforementioned.
c) Forests are important to avoid floods and droughts.
Forests can soak up excess rainwater, preventing run-offs and damage from flooding.
By releasing water in the dry season, forests can also help provide clean water and mitigate the effects of droughts.
d) It is dangerous to burn coal in a room where people are sleeping.
It is dangerous to burn coal in a closed room. The carbon monoxide gas produced can kill persons sleeping in that room.
Because burning coal produces CO2 and CO which is dangerous to human if inhaled,it reduces oxygen holding capacity of blood.
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