When a fertilised egg E formed in the oviduct of a human female divides repeatedly to form an embryo, the embryo gets implanted in the thick and soft lining of the uterus. After this a disc-like special tissue T develops between the uterus wall and embryo through which all the requirements of the developing embryo (and foetus) are met from the mother's body. The embryo is connected to the tissue T through a string like structure S.
(a) What is the other name of fertilised egg cell E?
(b) What is the name of tissue T?
(c) Name the string-like structure S.
(d) Name two substances which pass from mother's blood to embryo through tissue T and, one type of substance which passes from embryo to mother's blood.
(e) What happens to S when the baby is born? Why?
(a) Another name of a fertilized egg is the zygote.
(b) Placenta is a disc-like special tissue that develops between the uterus wall and embryo.
(c) An embryo is connected to the placenta through a string like structure known as an umbilical cord.
(d) Nutrients and oxygen are the substances that pass from the mother's blood to embryo through the placenta and, carbon dioxide and other waste products are the substance that passes from embryo to mother's blood.
(e) When a baby is born, the umbilical cord remains attached to the baby. It flows out along with the baby. It is cut and tied to separate a baby from the mother's body.
Related Articles
- Which one of the following best describes the function of the umbilical cord? It:(a) feeds the embryo with digested substances. (b) conveys nutrients and wastes to and from the embryo respectively (c) removes waste matter from the embryo to the mother's blood. (d) supplies oxygenated blood from the mother to the embryo.
- What is the name of the process in which thickened uterus lining along with blood vessels is removed from the body of a human female through vaginal bleeding?
- The eggs we get from the market are generally the unfertilised ones. In case you wish to observe developing chick embryo, get a fertilised egg from the poultry or hatchery which has been incubated for 36 hours or more. You may then be able to see a white disc-like structure on the yolk. This is the developing embryo. Sometimes if the heart and blood vessels have developed you may even see a red spot.
- The correct sequence of reproductive stages occurring in flowering plants is:(a) gametes, zygote, embryo, seed (b) zygote, gametes, embryo, gametes(c) seed, embryo, zygote, gametes (d) gametes, embryo, zygote, seed
- DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage- The cell which results after fusion of gametes is called a zygote. The fusion of male and female gametes (to form a zygote) is called fertilization. The zygote develops into an embryo. The cell which results after fusion of male gametes and female gametes is called(a) zygote(b) fertilization(c) embryo(d) none of these
- The liquid connective tissue A circulates in our body continuously without stopping. This tissue contains a pigment B which imparts it a colour C. The tissue A consists of four components D, E, F and G. The component D fights infection and protects us from diseases. The component E helps in the clotting of tissue A if a person gets a cut. The component F is a liquid which consists mainly of water with many substances dissolved in it and component G carries oxygen from the lungs to all the parts of the body.(a) What is (i) tissue A (ii) pigment B, and (iii) colour C ?(b) Name (i) D (ii) E (iii) F, and (iv) G.(c) Name one substance (other than oxygen) which is transported by tissue A in the human body.(d) Which two components of tissue A are the cells without nucleus ?(e) Name any two organisms (animals) which do not have liquid like A in their body.
- (a) How does the embryo get nourishment inside the mother's body?(b) If the blood group of father is A and the blood group of mother is O, what will be the blood group of their daughter? Explain how you have arrived at your answer.
- In which female reproductive organ does the embryo get embedded?
- In humans, the stage at which all the body parts of the embryo could be recognized is called-
- P is a cell (or group of cells) in the human body which is sensitive to a particular type of stimulus and conveys the messages to CNS through nerves Q. On the other hand, R is a part of the human body which can respond to a stimulus according to the instructions sent from the CNS through nerves S.(a) What is P? Name five organs which contain cells (or group of cells) like P.(b) Name the nerves Q.(c) What is R? Give two examples of R.(d) Name nerves S.(e) How do messages travel through the nerves Q and S?
- When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers an impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a issue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.(a) What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R?(b) What is (i) neuron S, and (ii) neuron T?(c) Name the tissue U.(d) What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?(e) Name the effector in this whole process.
- Water and dissolved minerals get into the root hair of a plant by a process called A and enter the conducting tissue B. The process C helps the water and dissolved minerals to move up through the tissue B in roots and stem, and reach the leaves of a plant . In the leaves food is made by a process D. This food is then transported to all the parts of a plant through tissue E. The process of distributing food made in the leaves to all the parts of the plant is called F.(a)What are (i) A (ii) B (iii) C (iv) D (v) E, and (vi) F ?(b) Which tissue is made up of living cells : B or E ?(c) Which tissue, B or E, contains sieve tubes ?(d) Which tissue, B or E, contains tracheids ?
- A woman uses a device X made of a common metal for preventing pregnancy. This device works by preventing the implantation of fertilised egg cell (or embryo) in the female organ Y.(a) What are the two names of device X? (b) Name the organ Y. (c) Can this method of contraception protect a woman from acquiring a STD?
- When a female child is born, her ovaries already contain thousands of immature eggs (or ova) contained in immature structures A. On maturing, A bursts open and an egg shoots out of the ovary in a process called B. The process B starts in the females at puberty and occurs again and again after a time period x. Before every occurrence of process B, the inner lining of uterus becomes thick and soft with lots of blood vessels in it. When the egg cells gets fertilised by a sperm, then an event C occurs in the life of mature human female which lasts for time period y leading to the birth of baby. If, however, the egg cell released by the ovary does not get a sperm to fuse with, then the thick and soft inner lining of uterus breaks down and comes out of the female's body in an event called D. The occurrence of event D is controlled by chemical substances E.(a) What are A? (b) What is process B? (c) What is the time period x? (d) Name the event C. (e) How much is the time period y? (f) What is the name of process D? (g) Name the chemical substances E.
Kickstart Your Career
Get certified by completing the course
Get Started