Give biological reasons for the following statements:
There is frequent urination in winter than in summer.
In winter, our body does not need to store much water because the
outside temperatures are low. Also, very less amount of water is lost
through perspiration during winter. Hence, urination is more frequent in
winter than in summer.
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:
In some xerophytes leaves are modified into spines.
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?
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).
State Mendel’s Law of Dominance.
Give biological reasons for the following statements:
The left ventricle of the heart has a thicker wall than the right ventricle.
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)?
Give biological reasons for the following statements:
Cutting of trees should be discouraged.
Give biological reasons for the following statements:
Some women have facial hair like heard and moustache.