Views: 2291 Posts: 0 Started By: oladamats Last Poster: ericyoung Last Post Date: Apr 19, 2018

April 19, 2018 ( Post 1 )

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Biology SOLUTIONS

Biology- Obj
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*BIOLOGY ANSWERS*

1i) sperm cell is the male reproductive cell that is expelled along with the seminal fluid or semen when a man ejaculates. In humans, spermatozoa determine the gender of the baby-to-be, which means that they can carry either the X or the Y chromosome.

ii)Palisade cells are found in the mesophyll of a leaf and their main function is the absorption of light so that photosynthesis can take place. The palisade mesophyll consists of chloroplasts with chlorophyll that absorb the light energy.

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2a)
i)carbon dioxideテつ
ii)Nitrogenテつ
2b)
i)CO2 is used by plants to photosynthesize carbohydrates.テつ
ii)Nitrogen is a major component of chhlorophyll
2ci)
Variegated leaf is a leaf that has green parts (where the cells contain chlorophyll) and non green parts (where there is no chlorophyll).
2cii)
The green parts
2ciii)
i)The parts without chlorophyll do not photosynthesiseテつ
ii)the cells contain chlorophyll
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3ai)
renewable resourceテつis aテつresourcewhich can be used repeatedly and replaced naturally.
3aii)
nonrenewable resource is a resource of economic value that cannot be readily replaced by natural means on a level equal to its consumption.テつ
3bi)
i)oxygen
ii)fresh water
3bii)
I)oil
ii)natural gas
3c)
i)Regulated and Planned Cutting of Trees.
ii)Control over Forest Fire.
iii)Reforestation and Afforestation.
v)Check over Forest Clearance for Agricultural and Habitation Purposes.
iv)Proper Utilisation of Forest and Forests Products.
3d)

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4a)
テつA gene is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases.

4aii) HYBRID

In biology, a hybrid, or crossbreed, is the result of combining the qualities of two organisms of different breeds, varieties, species or genera through s-xual reproduction.
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6ai)
Chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (e.g., hydrogen gas, hydrogen sulfide) or methane as a source of energy, rather than sunlight
6aii)
i)Bacteria
ii)methanogenic archaea
6b)
Nitrogen テ「竄ャ窶 78 percent.
Oxygen テ「竄ャ窶 21 percent.
Argon テ「竄ャ窶 0.93 percent.
Carbon dioxide テ「竄ャ窶 0.04 percent.

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