1. An individual trait may increase in a population in the following two ways:- The trait is beneficial to the population: if a trait is beneficial to a population, it will increase naturally. For example, green colour in beetles is favourable as it helps them in camouflage against the predators 2.BRead more
1. An individual trait may increase in a population in the following two ways:-
The trait is beneficial to the population: if a trait is beneficial to a population, it will increase naturally. For example, green colour in beetles is favourable as it helps them in camouflage against the predators
2.By accident: if a population faces an accident such that majority of its members get killed, the remaining members will pass on their traits to the subsequent generations. This will lead to an increase of the trait in the population.
3. By mutation
4. Natural Selection: if a trait is useful to the population, it will increase naturally.
After fertilization the lining of uterus thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition from the mother’s blood with he help of a special tissue called placenta. It is embedded in the uterine wall. Placenta contains Villi on the embryo’s side of tRead more
After fertilization the lining of uterus thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition from the mother’s blood with he help of a special tissue called placenta. It is embedded in the uterine wall. Placenta contains Villi on the embryo’s side of the tissue and blood spaces on mother’s side surrounding the villi. This provides a large surface from mother to the embryo and waste products from embryo to mother.
At the time of puberty, secondary sexual characters develop and sexual maturity takes place. This is manifested by many changes in both girls and boys. Some of the changes seen in girls at the time of puberty are as follows: a) Voice becomes thin b) Breasts enlarge c) Hips become rounded d) Hairs grRead more
At the time of puberty, secondary sexual characters develop and sexual maturity takes place. This is manifested by many changes in both girls and boys. Some of the changes seen in girls at the time of puberty are as follows:
a) Voice becomes thin
b) Breasts enlarge
c) Hips become rounded
d) Hairs grow under the armpit and in pubic area
The seminal vesicle and the prostate glands add their secretions so that the sperm are in a fluid which makes their transport easier and this fluid also provides nutrition.
The seminal vesicle and the prostate glands add their secretions so that the sperm are in a fluid which makes their transport easier and this fluid also provides nutrition.
Pollination is the process of transfer of pollens from anther to stigma. It occurs with the help of certain pollinators such as air, water, birds, or some insects. Fertilization, is the fusion of the male and female gametes. It occurs inside the ovule and leads to the formation of zygote.
Pollination is the process of transfer of pollens from anther to stigma. It occurs with the help of certain pollinators such as air, water, birds, or some insects.
Fertilization, is the fusion of the male and female gametes. It occurs inside the ovule and leads to the formation of zygote.
What are the different ways in which individuals with a particular trait may increase in a population?
1. An individual trait may increase in a population in the following two ways:- The trait is beneficial to the population: if a trait is beneficial to a population, it will increase naturally. For example, green colour in beetles is favourable as it helps them in camouflage against the predators 2.BRead more
1. An individual trait may increase in a population in the following two ways:-
See lessThe trait is beneficial to the population: if a trait is beneficial to a population, it will increase naturally. For example, green colour in beetles is favourable as it helps them in camouflage against the predators
2.By accident: if a population faces an accident such that majority of its members get killed, the remaining members will pass on their traits to the subsequent generations. This will lead to an increase of the trait in the population.
3. By mutation
4. Natural Selection: if a trait is useful to the population, it will increase naturally.
How does the embryo get nourishment inside the mother’s body?
After fertilization the lining of uterus thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition from the mother’s blood with he help of a special tissue called placenta. It is embedded in the uterine wall. Placenta contains Villi on the embryo’s side of tRead more
After fertilization the lining of uterus thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition from the mother’s blood with he help of a special tissue called placenta. It is embedded in the uterine wall. Placenta contains Villi on the embryo’s side of the tissue and blood spaces on mother’s side surrounding the villi. This provides a large surface from mother to the embryo and waste products from embryo to mother.
See lessWhat are the changes seen in girls at the time of puberty?
At the time of puberty, secondary sexual characters develop and sexual maturity takes place. This is manifested by many changes in both girls and boys. Some of the changes seen in girls at the time of puberty are as follows: a) Voice becomes thin b) Breasts enlarge c) Hips become rounded d) Hairs grRead more
At the time of puberty, secondary sexual characters develop and sexual maturity takes place. This is manifested by many changes in both girls and boys. Some of the changes seen in girls at the time of puberty are as follows:
See lessa) Voice becomes thin
b) Breasts enlarge
c) Hips become rounded
d) Hairs grow under the armpit and in pubic area
What is the role of the seminal vesicles and the prostate gland?
The seminal vesicle and the prostate glands add their secretions so that the sperm are in a fluid which makes their transport easier and this fluid also provides nutrition.
The seminal vesicle and the prostate glands add their secretions so that the sperm are in a fluid which makes their transport easier and this fluid also provides nutrition.
See lessHow is the process of pollination different from fertilisation?
Pollination is the process of transfer of pollens from anther to stigma. It occurs with the help of certain pollinators such as air, water, birds, or some insects. Fertilization, is the fusion of the male and female gametes. It occurs inside the ovule and leads to the formation of zygote.
Pollination is the process of transfer of pollens from anther to stigma. It occurs with the help of certain pollinators such as air, water, birds, or some insects.
See lessFertilization, is the fusion of the male and female gametes. It occurs inside the ovule and leads to the formation of zygote.