In the human eye, the image is formed on the: MCQ with Answer and Explanation

Question
In the human eye, the image is formed on the:
A. Retina
B. Cornea
C. Lens
D. Optic nerve
Answer: Option A
Solution (By JKExamLibrary)
The retina is the light-sensitive inner layer of the eye containing photoreceptors (rods and cones) where an inverted real image is formed. The cornea and lens focus light onto the retina. The optic nerve transmits impulses from the retina to the brain for interpretation. The fovea centralis is the point of sharpest vision.
This question belongs to: Science Biology

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Practice More Biology Questions

Question #1
Which of the following diseases is caused by a protozoan?
A. Tuberculosis
B. Measles
C. Tetanus
D. Kala-azar
Discuss

Correct Answer: Option D

Explanation:
Kala-azar (visceral leishmaniasis) is caused by the protozoan Leishmania donovani, transmitted by sandfly bite. Tetanus is bacterial (Clostridium tetani), tuberculosis bacterial (Mycobacterium tuberculosis), measles viral. Protozoan diseases include malaria, amoebiasis, sleeping sickness, giardiasis. Kala-azar causes fever, weight loss, splenomegaly, and is endemic in parts of India.
This question belongs to: Science Biology
Question #2
The 'Hormone Peptide YY' (PYY) is secreted by the L cells of the distal gastrointestinal tract (ileum and colon) in response to food intake. Its primary function is to:
A. Stimulate gastric acid secretion
B. Inhibit gastric emptying and pancreatic secretion, and reduce appetite (satiety signal)
C. Stimulate appetite
D. Increase intestinal motility
Discuss

Correct Answer: Option B

Explanation:
Peptide YY (PYY) is a gut hormone secreted by the L cells in the mucosa of the distal small intestine (ileum) and colon, primarily in response to food ingestion, especially fats. Its primary functions are related to the 'ileal brake' mechanism: it inhibits gastric emptying and pancreatic exocrine secretion, slowing down the transit of food through the upper GI tract to allow more time for digestion and absorption in the ileum. It also acts on the hypothalamus to reduce appetite, serving as a satiety signal.
This question belongs to: Science Biology
Question #3
The 'Hormone Prolactin' is secreted by the anterior pituitary gland. Its primary physiological role is to:
A. Stimulate the development of mammary glands and the production of milk (lactogenesis)
B. Stimulate uterine contractions
C. Maintain the corpus luteum
D. Trigger ovulation
Discuss

Correct Answer: Option A

Explanation:
Prolactin (PRL) is a peptide hormone secreted by the lactotroph cells of the anterior pituitary gland. Its primary and namesake function is to stimulate the development of the mammary glands during pregnancy and to initiate and maintain the production of milk (lactogenesis) after childbirth. While prolactin levels rise significantly during pregnancy, the high levels of estrogen and progesterone inhibit actual milk secretion until after delivery. Suckling by the infant is the primary stimulus for continued prolactin release.
This question belongs to: Science Biology
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