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A home-made wormery
A wooden box 30 cm by 30 cm by 15 cm fitted with a glass front is beneficial for studying the habits of earth-worms.
Fill the box nearly to the top with layers of (a) sand; (b) leaf mould; and (c) loam, padding down every layer before adding the next.
Place lettuce leaves, dead leaves, carrot, etc. on the surface soil, together with few worms.
Keep the contents damp and examine the behaviour of the worms.
which organism are called primitive and how are they different from the so-called adavnced organisms
Define the Protective of Vitamin C role as an antioxidant? Vitamin C is a powerful antioxidant because it can donate a hydrogen atom and form a relatively stable ascorbyl free
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Explain the Mendel's Laws in genetics? Based on the results of his experiments, Mendel proposed three laws regarding the inheritance of traits: the Law of Segregation, the Law
How does refrigeration help to stop food from going bad? Western diets are often unhealthy due to they have too much sugar and fat, and not sufficient fibre.
This problem refers to the MN and ABO loci mentioned in class. It also refers to the Rh locus, which is responsible for the positive/negative part of the blood type. The Rh+ allele
What is the prevailing wind direction in equatorial regions affected by the trade winds? a) The wind blows from east to west b) the wind blows from west to east.
What is the relevance of knowing about GI of foods? Let us see how this index is helpful in prescribing therapeutic diets. You would realize that the dietary GI provides an ind
What are one advantage and one disadvantage of asexual reproduction compared with sexual reproduction? The benefit of asexual reproduction is that off- spring are genetically
As we age, our skin wrinkles due to change in collagen and elastic fibers in the dermis and a decrease in their production. Explain why topical application of collagen and elastic
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