BIOLOGY OBJ LOADING..

Biology-Obj
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BIOLOGY QUESTIONS PAPER


BIOLOGY THEORY ANSWERS LOADING..

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.
No 2
Oxygen and carbon dioxide
2b
Oxygen breakdown complex molecules in respiration that was generated in photosynthesis
Carbon dioxide splits water during photosynthesis
2c
variegated leaf means colored . … Plant have mix colour leaf called variegated leaf. Variegated leaf have green parts (where the cells contain chlorophyll) and white parts (where there is no chlorophyll).
3ai)
renewable resource is a 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.
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.
4a)
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 sexual reproduction.
4ci height of plant
ii size of various parts of the plant such as stems, leaves, flowers, fruits
iii color of parts of plants such as green, white and brown of leaves, stem and root

3ai)
renewable resource is a 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.
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.
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 — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.

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