Give biological reasons for the following statements:
Cutting of trees should be discouraged.
Cutting trees results in an increase in the concentration of carbon dioxide
in the atmosphere resulting in global warming. Hence, cutting of trees
should be discouraged.
The diagram shown below is the longitudinal section of a testis of man. Study it
carefully and answer the questions that follow:
Draw a neat, labelled diagram of a sperm.
In a homozygous pea plant, axial flowers (A) are dominant over terminal
flowers (a).
What is the phenotype and genotype of the F1 generation if a plant bearing
pure axial flowers is crossed with a plant bearing pure terminal flowers?
In a homozygous pea plant, axial flowers (A) are dominant over terminal
flowers (a).
What is the phenotypic ratio and genotypic ratio of the above cross shown
in (ii)?
In a homozygous pea plant, axial flowers (A) are dominant over terminal
flowers (a).
State Mendel’s Law of Dominance.
Give biological reasons for the following statements:
In some xerophytes leaves are modified into spines.
Give biological reasons for the following statements:
The left ventricle of the heart has a thicker wall than the right ventricle.
Give biological reasons for the following statements:
Some women have facial hair like heard and moustache.
In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a).
Draw a Punnett square board to show the gametes and offsprings when both the parent plants are heterozygous for axial flowers.
Give biological reasons for the following statements:
There is frequent urination in winter than in summer.
