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Birth control pills check ovulation in female by inhibiting the secretion of:
(3) Oral administration of small doses of either progestogens or progestogen–estrogen combinations is a contraceptive method which inhibit ovulation and implantation by inhibiting the secretion of FSH and LH. (page-61)
Natural methods of birth control include?
(a) Periodic abstinence is a method in which the couples avoid or abstain from coitus from day 10 to 17 of the menstrual cycle when ovulation could be expected. As chances of fertilisation are very high during this fertile period. Therefore, by abstaining from coitus, conception could be prevented.
(b) Withdrawal or coitus interruptus is a method in which the male partner withdraws his penis from the vagina just before ejaculation so as to avoid insemination.
(c) Lactational amenorrhea (absence of menstruation) method is based on the fact that the cycle do not occur during the period of intense lactation following parturition. Therefore, as long as the mother breast-feeds the child fully, chances of conception are almost nil. (page- 59,60)
Match the Column-A with the Column-B:
|
Column-I |
Column-II |
|
I. IUT |
A. Copper T |
|
II. Birth control |
B. Agent to kill spermatozoa |
|
III. Spermicides |
C. VDRL |
|
IV. STD |
D. To help infertile couple |
I. IUT: is a technique to help infertile people, the semen collected either from the husband or a healthy donor is artificially introduced either into the vagina or into the uterus of the female.
II. Birth control: Copper T is an IUD which increases phagocytosis of sperms within the uterus and the Cu ions released suppress sperm motility and the fertilising capacity of sperms.
III. Spermicides: agent to kill spermatozoa, are used along with condoms and other barriers to increase contraceptive efficiency.
IV. STD: VDRL stands for Venereal Disease Research Laboratory, is a blood test that detects an antibody that is present in the bloodstream when a patient has syphilis.
Which one of the following is the most widely accepted method of contraception in India, as at present?
(1) IUDs are ideal contraceptives for the females who want to delay pregnancy and/or space children. It is one of most widely accepted methods of contraception in India. (page- 60,61)
The ultimate source of allelic variations is:
This makes mutaion is the most important evolutionary agent as it introduces new alleles into the gene pool of a population increasing variation.
People who carry an allele for normal haemoglobin and an allele for sickle cell are resistant to malaria. They are examples of:
Answer 1. The heterozygote does not develop severe malaria and severe anemia as well.
In a population of red (dominant) and white flowers, the flowers of red flowers is 91%. What is the frequency of the red allele?
Answer 4. The white flowers are 9% or the frequency of the recessive allele would be 0.3 or 30%. The frequency of the dominant allele would be 70%
The similarities between the eyes of an octopus and of a mammal are a result of:
1. Page 131, XII NCERT
Most fossils are found in:
Sedimentary rocks
Genetic drift occurs when a few individuals of a species colonize an island. The particular phenomenon is known as:
(b) In population genetics, the founder effect is the loss of genetic variation that occurs when a new population is established by a very small number of individuals of a larger population. It was first fully outlined by Ernst Mayr in 1942, using existing theoretical work by those such as Sewall Wright.
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