All Free Biology MCQs with Answers

• A. It can be used for detection of Down's syndrome
• B. It can be used for detection of cleft palate
• C. It is usually done when a woman is between 14-16 weeks pregnant
• D. It is used for prenatal sex determination

Explanation: The incorrect statement regarding amniocentesis is:b. It can be used for detection of cleft palate.Now, let's explain each option and why…

• A. Gamete Internal Fertilisation and Transfer
• B. Germ cell Internal Fallopian Transfer
• C. Gamete Intra Fallopian Transfer
• D. None of these

Explanation: The correct answer is:c. Gamete Intra Fallopian TransferNow, let's explain each option and why the correct answer is c:a.

• A. Chikungunya virus
• B. Ebola virus
• C. Hepatitis B virus
• D. Human immunodeficiency virus (HIV)

Explanation: Correct answer isa. Chikungunya virusHere's an explanation of each option:a.

• A. Small part of the Fallopian tube is removed or tied up
• B. Ovaries are removed surgically
• C. Small part of vas deferens is removed or tied up
• D. Uterus is removed surgically

Explanation: The correct option is: a. Small part of the Fallopian tube is removed or tied up Here's an explanation of each option:a.

• A. Ovum into the Fallopian tube
• B. Zygote into the Fallopian tube
• C. Zygote into the uterus
• D. Embryo with 16 blastomeres into the Fallopian tube

Explanation: The correct answer is:c. Zygote into the uterusHere's an explanation of each option:a.

• A. This method involves introducing donor sperm into the woman's vagina, with the expectation that the sperm will travel through the cervix and into the uterus to potentially fertilize an egg. It is one form of artificial insemination
• B. Introduction of sperms of a healthy donor directly into the ovary
• C. Transfer of sperms of a healthy donor to a test tube containing ova
• D. All of these

Explanation: Hence the correct answer is option A. This method involves introducing donor sperm into the woman's vagina, with the expectation that the…

• A. Ova
• B. Embryo
• C. Morula
• D. Zygote

Explanation: The stage transferred into the uterus after induced fertilization of an ovum in the laboratory is typically the embryo.

• A. Intra cytoplasmic sperm injection (ICSI)
• B. Intra uterine insemination (IUI)
• C. Zygote intra Fallopian transfer (ZIFT)
• D. All are methods

Explanation: The "test-tube baby" program employs the technique of in vitro fertilization (IVF).

• A. IUDs (Intra uterine devices)
• B. Tubectomy
• C. Diaphragms
• D. Both A and B

Explanation: a. IUDs (Intrauterine Devices): IUDs are indeed a popular and effective form of contraception in India.

• A. Seven weeks
• B. Twelve weeks
• C. Eight weeks
• D. Six weeks

Explanation: Medical termination of pregnancy (MTP) or abortion is the termination of pregnancy before the fetus becomes viable.

• A. Who cannot produce an ovum
• B. Who cannot retain the fetus inside uterus
• C. Whose cervical canal is too narrow to allow passage for the sperms
• D. Who cannot provide suitable environment for fertilization

Explanation: Gamete Intra Fallopian Transfer (GIFT) is a transfer of an ovum collected from a donor into the fallopian tube of another female who…

• A. Detecting sex of the unborn foetus
• B. Artificial insemination
• C. Transfer of embryo into the uterus of a surrogate mother
• D. Detecting any genetic abnormality

Explanation: Amniocentesis is a withdrawal of a sample of the fluid (amniotic fluid) surrounding a fetus in the uterus by piercing the amniotic sac…

• A. Make uterus unsuitable for implantation
• B. Increase phagocytosis of sperms
• C. Suppress sperm motility
• D. Prevent ovulation

Explanation: Copper-releasing IUDs (i.e., CuT, LNG­20) are placed in the uterus of the females. They are efficient birth control methods.

• A. Fecundity
• B. Environmental Resistances
• C. Biotic Control
• D. Mortality

Explanation: The correct answer is Environmental Resistances. These are the factors that limit the growth of a population, including both biotic…

• A. To inhibit ovulation
• B. To inhibit fertilization
• C. To inhibit implantation of blastocyst
• D. To inhibit gametogenesis

Explanation: Copper­-T is an intrauterine device (IUD) used by women as birth control. An IUD is a small device that is placed inside the uterus.

• A. To inhibit ovulation
• B. To check oogenesis
• C. To check entry of sperms into cervix and to make them inactive
• D. To check sexual behaviour

Explanation: Pills also called contraceptive pills contain small doses of either progestogens or progestogen­-oestrogen combinations.

• A. Progesterone
• B. LH
• C. FSH
• D. Both (B) and (C)

Explanation: Male contraceptives work by interfering with sperm production or delivery, which means they inhibit spermatogenesis as well as the…

• A. Thyroxine
• B. Luteinizing hormone
• C. Progesterone
• D. Growth hormone

Explanation: The most common type of pill is the so called "combined pill". It contains a combination of synthetic progestins (acting like…

• A. Fertilization and development both in uterus
• B. Fertilization in vitro and then transplantation in uterus
• C. A baby grown in test tube
• D. Fertilized and developed embryo in test tube

Explanation: By in vitro fertilization, the ovum is fertilized with sperm outside the body of a woman, providing the ovum with the same environmental…

• A. Sperm duct
• B. Seminiferous tubules
• C. Ejaculatory duct
• D. Epididymis

Explanation: The correct answer is the seminiferous tubules. Spermatogenesis, the process of developing mature spermatozoa, starts with the production…