All Free Biology MCQs with Answers

• A. Breast enlargement
• B. Broadening of shoulder
• C. Fatigue
• D. Bloating

Explanation: During menstruation, several temporary physical and emotional changes occur in females due to hormonal fluctuations (mainly estrogen and…

• A. LH
• B. Progesterone
• C. FSH
• D. Estrogen

Explanation: The correct answer is Progesterone. Progesterone is vital for maintaining the uterine lining during pregnancy, providing the necessary…

• A. Fallopian tube
• B. Uterine tube
• C. Both A and B
• D. Uterus

Explanation: The terms "fallopian tube" and "uterine tube" are synonymous, both referring to the same anatomical structures in the female reproductive…

• A. Test tube baby
• B. Cloning
• C. In vitro fertilization
• D. Both A and C

Explanation: Test tube baby is in vitro fertilisation where the the egg is fertilized with sperm in a laboratory, and the resulting embryo is then…

• A. Ovary
• B. Vagina
• C. Urethra
• D. Uterus

Explanation: Urethra does not play a role in the female reproductory system. The urethra is the tube that carries urine from the bladder to the outside…

• A. Uterus
• B. Cervix
• C. Oviduct (fallopian tube)
• D. Ovary

Explanation: The uterus opens into the vagina through the cervix. The cervix is a small, cylindrical structure that connects the uterus to the…

• A. Lactation
• B. Ovulation
• C. Placenta formation
• D. Menstruation

Explanation: Ovulation is the process in which a mature egg is released from the ovary.

• A. Menstruation
• B. Ovulation
• C. Puberty
• D. Birth

Explanation: Puberty is the period of development during which sexual maturation occurs, leading to the development of secondary sexual characteristics.

• A. Shoulders broaden
• B. Egg production
• C. Enlarge breast
• D. None of these

Explanation: Broadening of shoulders is not a secondary characteristic in females. Secondary sexual characteristics are physical features that develop…

• A. Menstrual phase
• B. Secondary Phase
• C. Secretory phase
• D. None of these

Explanation: The proliferative phase is also called the follicular phase. This is because it is the phase of the menstrual cycle in which the follicles…

• A. Ovulation
• B. Menstruation
• C. Oestrous
• D. All of these

Explanation: Ovulation is the phenomenon in which one mature egg (ovum) is released from the ovary into the fallopian tube.

• A. Gonorrhoea
• B. Syphilis
• C. Genital Herpes
• D. AIDS

Explanation: Syphilis is a sexually transmitted disease (STD) caused by the bacterium Treponema pallidum.Gonorrhea is a sexually transmitted disease…

• A. Gibberellins
• B. Auxins
• C. Cytokinins
• D. Abscisic acid

Explanation: Gibberellins is a plant hormone, however, it does not directly induce Parthenocarpy.

• A. Morphogenesis
• B. Epimorphosis
• C. Morphallaxis
• D. Accretionary growth

Explanation: There are two mechanisms of regeneration: morphallaxis and epimorphosis.

• A. Regeneration
• B. Growth
• C. Metamorphosis
• D. Aging

Explanation: Metamorphosis is a process of a series of changes of form from larva to adult after embryonic development.

• A. Autogamy and Geitonogamy
• B. Geitonogamy and Xenogamy
• C. Cleistogamy and Xenogamy
• D. Autogamy and Xenogamy

Explanation: Dioecious plants are those plants in which male flowers and female flowers are borne on different plants.

• A. Pollen grains of many species cause severe allergies
• B. Stored pollen in liquid nitrogen can be used in crop breeding programs
• C. Tapetum helps in the dehiscence of anther
• D. Exine of pollen grains is made up of sporopollenin

Explanation: Tapetum is the innermost wall layer of microsporangium that nourishes developing pollen grains. A.

• A. Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil
• B. Some reptiles have also been reported as pollinators in some plant species
• C. Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style
• D. Insects that consume pollen or nectar without bringing about pollination are called pollen/ nectar robbers.

Explanation: Pollen­pistil interaction is the group of events that occur from the time of pollen deposition over the stigma to the time of pollen tube…

• A. China rose
• B. Onion
• C. Pea
• D. Cucumber

Explanation: In cucumber, unisexual flowers i.e., separate male and female flowers are present on the same plant (monoecious plant) A.

• A. Jackfruit
• B. Banana
• C. Brinjal
• D. Apple

Explanation: Parthenocarpic fruits are fruits that are formed without fertilization. These fruits are naturally seedless, e.g., banana