All Free Biology MCQs with Answers

• A. Produce sperms
• B. Store food for the developing embryo
• C. Transfer sperms from the stigma to the ovary
• D. Produce female gametophytes

Explanation: The pollen tube is a crucial structure in the reproductive process of seed plants.

• A. Spores
• B. Sperms
• C. Seeds
• D. Ova

Explanation: The testes (or testicles) are critical to the male reproductive system, primarily producing sperm and the hormone testosterone.

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

Explanation: The correct answer is LH, as it is the hormone whose surge triggers ovulation and is detected by ovulation prediction kits.

• A. Causes epicotyl (plumule) hook to unbend
• B. Induces increase in leaf area
• C. Elongation of internodes is promoted
• D. Stimulate flowering in long day plants
• E. Phytochrome 660 changes to phytochrome 730

Explanation: Red light does not promote internode elongation in plants. Promoting elongation of internodes: This is known as the stem elongation…

• A. Single cycle
• B. Two cycles
• C. Three cycles
• D. Four cycles

Explanation: The menstrual cycle is governed by hormonal changes. These changes can be altered by using hormonal birth control to prevent pregnancy.

• A. Oogonium to primary oocyte
• B. Primary oocyte to secondary oocyte
• C. Secondary oocyte to egg
• D. None of the given options

Explanation: In oogenesis, diploid oogonium goes through mitosis until one develops into a primary oocyte, which will begin the first meiotic division…

• A. Leyding cells
• B. Hensen's node cells
• C. Sertoli cells
• D. Interstitial cells

Explanation: Inhibin hormone is produced by Sertoli cells in human males. Inhibin inhibits the secretion of FSH from the pituitary gland, helping to…

• A. Spermatocytes
• B. Spermatids
• C. Sertoli cells
• D. Polar bodies

Explanation: Through meiosis sperms are produced. A primary spermatocyte is transformed into two secondary spermatocytes during meiosis I - these cells…

• A. Death
• B. Birth
• C. Ovulation
• D. Fertilization

Explanation: The secondary oocyte commences meiosis 2 which arrests at metaphase and will not continue without fertilization.

• A. Follicle stimulating
• B. Estrogen
• C. Luteinizing hormone
• D. Progesterone

Explanation: Luteinizing hormone (LH), aids in egg maturation and provides the hormonal trigger to cause ovulation and the release of eggs from the…

• A. Oogonia
• B. Primary oocyte
• C. Secondary oocyte
• D. Ova

Explanation: Option A: Oogonia are the immature egg cells that are present in the ovaries before birth.

• A. Ovulation
• B. Primary oocyte
• C. Secondary oocyte
• D. Ova

Explanation: Option A: Ovulation is the process of the release of an egg from the ovary. The fallopian tube is not involved in ovulation.

• A. Red
• B. Yellow
• C. Grey
• D. Black

Explanation: Option A: The corpus luteum is not red. If it appears red, it may be due to bleeding or inflammation.

• A. A. Spermatogonia
• B. B. Oogonia
• C. C. Polar body
• D. D. Ovum

Explanation: The correct answer is Option C: Polar body. During oogenesis, a mature ovum is formed alongside smaller cells known as polar bodies.

• A. AIDS
• B. Hepatitis
• C. Gonorrhoea
• D. All of these

Explanation: Gonorrhea is a bacterial infection. This is a sexually transmitted infection caused by the bacterium Neisseria gonorrhoeae.

• A. 25
• B. 26
• C. 27
• D. 28

Explanation: The length of the menstrual cycle varies from woman to woman, but the average is to have periods every 28 days.

• A. 2nd month
• B. 3rd month
• C. 4th month
• D. 5th month

Explanation: An embryo is termed a fetus beginning in the 11th week of pregnancy, which is the 9th week of development after fertilization of the egg.

• A. Oestrous cycle
• B. Menstrual cycle
• C. Both A and B
• D. None of these

Explanation: Menstrual cycle is the reproductive period or cycle of females , it is a complex cycle controlled by female hormones that cause regular…

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

Explanation: The ovary, under the stimulus of FSH, also produces estrogen hormone.-This, on one hand, stimulates the endometrium (internal lining of…

• A. Syphilis
• B. Genital herpes
• C. Gonorrhoa
• D. HPV

Explanation: Genital herpes transmits during birth to infants damaging the eyes and CNS of infants.