What are the different methods of contraception?
There are various birth control methods which prevent fertilization (meeting of a sperm to ovum to form a zygote) is known as contraception. There are mainly three major types of contraception:-
Temporary methods
Permanent method
Medical termination of pregnancy
Temporary methods:- they contain natural, barrier or physiological methods of the birth control. In natural, Lactation amenorrhea (absence of menstruation) method is used, where there is intense lactation occurs during the absence of periods in females which prevents from the birth control. In barrier methods- condoms, cervical caps, vaults and Intrauterine devices are used for the contraception. Or, in physiological devices oral pills or injections can be taken for the birth control which confirms the ovulation occurance in females by secreting the FSH (follicle stimulating hormone) or LH (Luteinizing hormone).
Permanent method:- it is a surgical method for the birth control. In man it is known as Vasectomy or in females it is known as tubectomy. Vasectomy is the process of removal of short segment of each vas deferens and tying up of the remaining ends tightly with the surgical thread. And tubectomy is the process of removal of fallopian tube and the remaining ends are tied up tightly with the surgical thread.
Medical termination of pregnancy:- also called induced abortion. It is the voluntary termination of a pregnancy before the foetus making. It is done to get rid of unwanted pregnancy, rapes etc.
Why is variation beneficial to the species but not necessarily for the individual?
Draw a labelled diagram of the longitudinal section of a flower.
What are the functions performed by the testis in human beings?
Why does menstruation occur?
How will an organism be benefited if it reproduces through spores?
Asexual reproduction takes place through budding in
(a) amoeba.
(b) yeast.
(c) plasmodium.
(d) leishmania.
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
How does the embryo get nourishment inside the mother’s body?
What are the advantages of sexual reproduction over asexual reproduction?
What is the importance of DNA copying in reproduction?
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
What is a good source of energy?
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What changes can you make in your habits to become more environment-friendly?
What is the difference between a reflex action and walking?
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Why should a magnesium ribbon be cleared before burning in air?
Define the principal focus of a concave mirror.
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
At the time of short circuit, the current in the circuit
(a) reduces substantially.
(b) does not change.
(c) increases heavily.
(d) vary continuously.
Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
Explain the following in terms of gain or loss of oxygen with two examples each.
(a) Oxidation
(b) Reduction
Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
The essential difference between an AC generator and a DC generator is that
(a) AC generator has an electromagnet while a DC generator has permanent magnet.
(b) DC generator will generate a higher voltage.
(c) AC generator will generate a higher voltage.
(d) AC generator has slip rings while the DC generator has a commutator.
What is the principle of an electric motor?
Which of the following terms does not represent electrical power in a circuit?
(a) I2R (b) IR2 (c) VI (d) V2/R
An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.
An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.
Which of the following constitute a food-chain?
(a) Grass, wheat and mango
(b) Grass, goat and human
(c) Goat, cow and elephant
(d) Grass, fish and goat