All Free Biology MCQs with Answers

• A. 12th - 14th
• B. 14th - 16th
• C. Last 2 days of menstrual cycle
• D. 8th-10th

Explanation: Based on the explanations provided and the image, the correct answer to the question is B) 14th - 16th.

• A. At the end of proliferative phase
• B. In the middle of secretory phase
• C. Just before the end of secretory phase
• D. In the beginning of proliferative phase

Explanation: Based on the explanations provided and the image, the correct answer to the question is A) At the end of the proliferative phase.

• A. FSH, progesterone, estrogen
• B. Estrogen, FSH, progesteron
• C. FSH, estrogen, progesterone
• D. Estrogen, FSH, progesterone

Explanation: The hormonal sequence during the menstrual cycle begins with an increase in FSH levels, followed by the production of estrogen as the…

• A. Primordial germ cell
• B. Oogonium
• C. Primary oocyte
• D. Secondary oocyte

Explanation: After the first meiotic division of the primary oocyte, it forms a secondary oocyte and a polar body.

• A. Menopause
• B. Puberty
• C. Gestation
• D. Menarche

Explanation: Menarche is the term used to describe the first occurrence of menstruation in a female's life.

• A. Corpora cardiaca
• B. Corpus luteum
• C. Corpora albicans
• D. Graafian follicle

Explanation: During the secretory phase of the menstrual cycle, the ruptured follicle in the ovary transforms into a structure called the corpus…

• A. Somatic hybridization
• B. Spermatogenesis
• C. Oogenesis
• D. Spermiogenesis

Explanation: Oogenesis is the process of producing ova (eggs) in the ovaries of females.

• A. Formation of first polar body
• B. Formation of second polar body
• C. Meiosis -II
• D. Division of secondary oocyte

Explanation: The correct answer is the formation of the first polar body because this event occurs during the first meiotic division (Meiosis I) of…

• A. Fall in level of progesterone
• B. Increase in estrogen level
• C. Increase in FSH level
• D. Decrease in oxytocin level

Explanation: When progesterone secretion is reduced its supporting effect on the endometrium decreases so, it breakdown causing menstruation.

• A. Presence /absence of a tail
• B. Number of chromosomes
• C. Being hormone producing/non-hormone producing
• D. Primary gamete/secondary gamete in males

Explanation: This is the key difference between primary and secondary spermatocytes.

• A. Diploid spermatids
• B. Haploid sperm
• C. Diploid sperm
• D. Haploid spermatid

Explanation: Secondary spermatocytes are haploid cells, smaller than primary spermatocytes, and show coarse chromatin granules and abundant rough…

• A. Mitotic division of secondary oocyte
• B. Meiotic division of primary ooeyte
• C. Mitotic division of primary oocyte
• D. Meiotic division of secondary oocyte

Explanation: When a sperm enters the cytoplasm of an ovum, it triggers the completion of the second meiotic division in the ovum, which was previously…

• A. Corpus luteum
• B. Follicle atresia
• C. Primary follicles
• D. Oogonium

Explanation: The corpus luteum is a temporary endocrine gland that develops from a ruptured follicle after ovulation.

• A. Follicular stage --> luteal stage -> ovulation ---> menstrual
• B. Follicular --> ovulation --> menstrual --> luteal
• C. Follicular --> ovulation --> luteal --> menstruation
• D. Menstrual --> luteal --> ovulation --> follicular

Explanation: Menstrual phase: This is the first phase of the menstrual cycle, and it begins when the lining of the uterus sheds.

• A. Myometrium
• B. Perimetrium
• C. Endometrium
• D. Epimetrium

Explanation: The inner lining of the uterus is called the endometrium. So, option C is correct.

• A. Ovopause
• B. Menarche
• C. Menopause
• D. Menstruation

Explanation: Menopause is the stage in a woman's life when her menstrual cycle stops permanently. It usually occurs between the ages of 45 and 55.

• A. 4
• B. 8
• C. 16
• D. 32

Explanation: Each secondary spermatocyte produces 2 spermatids, so 4 secondary spermatocytes will produce 4 x 2 = 8 spermatids. So option B is correct.

• A. Fallopian tube
• B. Uterine tube
• C. Proximal part of oviduct
• D. Proximal part of oviduct, uterine tube & fallopian tube

Explanation: The fallopian tube, also known as the uterine tube or oviduct, is the structure that receives the ovulated oocyte and is the site where…

• A. Gonorrhea
• B. Syphilis
• C. Genital herpes
• D. Genital herpes, AIDS

Explanation: Obligate intracellular parasites are organisms that can only survive inside the cells of other organisms.

• A. Interstitial cells
• B. Germ cells
• C. Sertoli cells
• D. Spermatocyte

Explanation: Interstitial cells, also known as Leydig cells, are located in the spaces between the seminiferous tubules in the testes.