In the human body, the 'Hypothalamus' is a small but crucial region of the brain that links the nervous system to the endocrine system via the: MCQ with Answer and Explanation
In the human body, the 'Hypothalamus' is a small but crucial region of the brain that links the nervous system to the endocrine system via the:
A. Thyroid gland
B. Adrenal gland
C. Pituitary gland
D. Spinal cord
Answer: Option C
Solution (By JKSSB Mock Tests)
The hypothalamus is a small, highly complex region located at the base of the brain, near the pituitary gland. It is the primary link between the nervous and endocrine systems. It controls the pituitary gland (the 'master gland') both neurally (via the posterior pituitary, where it stores and releases ADH and oxytocin) and hormonally (via the anterior pituitary, by secreting releasing and inhibiting hormones that regulate the production of anterior pituitary hormones). Through the pituitary, the hypothalamus regulates a vast array of bodily functions.
Explanation:
Phycoerythrin is a red phycobiliprotein that masks chlorophyll in red algae (Rhodophyta). Phycocyanin is blue in cyanobacteria, fucoxanthin brown in brown algae. These accessory pigments allow light absorption at depths.
Consider statements about angiosperms: 1. They have enclosed seeds. 2. They exhibit double fertilization. 3. All angiosperms are trees. Which are correct?
Explanation:
Angiosperms are flowering plants where seeds are enclosed within a mature ovary (fruit). They are characterized by double fertilization, where one male gamete fuses with the egg and the other with the secondary nucleus. They exhibit immense diversity in habit, ranging from tiny aquatic Wolffia to massive trees, so not all are trees. Statements 1 and 2 are correct.
Explanation:
Zinc is a component of the insulin hexamer stored in pancreatic beta cells; it stabilizes the insulin structure. Iron is in hemoglobin, calcium in bones/signaling, sulfur in some amino acids. Zinc deficiency impairs insulin secretion. Many enzymes require zinc as a cofactor.
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