Question
Describe the process of development and birth in humans.
✓
Answer
(i) The zygote formed after fertilization in the oviduct, undergoes repeated mitotic divisions and embryo is formed.
(ii) Meanwhile, it is pushed towards the uterus.
(iii) Once it reaches the uterus, it is implanted and further development occurs after implantation.
(iv) An organ called as placenta is formed for supply of food material during the growth of the embryo in the uterus.
(v) Embryonic development is completed approximately within nine months after fertilization following which birth takes place.
(ii) Meanwhile, it is pushed towards the uterus.
(iii) Once it reaches the uterus, it is implanted and further development occurs after implantation.
(iv) An organ called as placenta is formed for supply of food material during the growth of the embryo in the uterus.
(v) Embryonic development is completed approximately within nine months after fertilization following which birth takes place.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Write short notes :
Hope's apparatus
Hope's apparatus
A four carbons atoms containing neutral organic compound $X$ reacts with sodium metal to evolve a gas which burns with 'pop' sound. Another four carbon atoms containing carbon compound reacts with sodium hydrogen carbonate to evolve a gas which turns lime water milky. When compounds $X$ and $Y$ are heated together in the presence of a little of concentrated sulphuric acid, then a new compound $Z$ is formed.
→- What is compound $X?$ Also write its formula.
- What is compound $Y?$ Also write its formula.
- What is compound $Z?$ Also write its formula.
- What type of smell is given by compound $Z?$
- What is the general name of compounds like $Z?$
- What is the general name of the reaction which which takes place between $X$ and $Y$ to form $Z?$
What is an electric motor? With the help of a labelled diagram, describe the working of a simple electric motor.
Does pollution deplete the quality of air? Explain with suitable example.
Observe the figure and write the answers to the questions asked.
- The construction shown in the figure is of which device?
- Explain the principle on which this device works.
- Write any three uses of this device.
What is the reaction called when oxidation and reduction take place simultaneously?
Write short notes: Lamarckism.
What is lymphatic system? What are its functions?
Answer the following questions based on human male reproductive system:
i. In which organ sperms are formed?
ii. What is the length of a sperm?
iii. What is the work of vas deferens?
iv. By which type of cell division, sperms are formed?
v. Name any two unpaired organs of male reproductive system.
i. In which organ sperms are formed?
ii. What is the length of a sperm?
iii. What is the work of vas deferens?
iv. By which type of cell division, sperms are formed?
v. Name any two unpaired organs of male reproductive system.
You are given an organic compound having the molecular formula $C_3H_8.$ Give the name and formula of the compound formed:
→- When one H atom of $C_3H_8$ is replaced by a $Cl$ atom.
- When one H atom of $C_3H_8$ is replaced by a $OH$ group.
- When one H atom of $C_3H_8$ is replaced by a $CHO$ group.
- When one H atom of $C_3H_8$ is replaced by a $COOH$ group.
- When two H atoms joined to the middle carbon atom of $C_3H_8$ are replaced by one O atom.