The region of the root where root hairs are formed is the:
A. Zone of maturation
B. Root cap
C. Zone of elongation
D. Meristematic zone
Answer: Option A
Solution (By JKSSB Mock Tests)
Root hairs are unicellular extensions of epidermal cells found in the zone of maturation (differentiation) of the root, just behind the zone of elongation. They increase surface area for water and mineral absorption. The root cap protects the tip, the meristematic zone contains dividing cells, and the elongation zone causes root lengthening.
Explanation:
Neutrophils are the most abundant white blood cells, constituting about 60-65% of the total WBC count. They are polymorphonuclear and are highly phagocytic, acting as the first line of defense against bacterial infections. Lymphocytes are the second most abundant (20-25%), while monocytes and eosinophils are present in smaller percentages.
Explanation:
Rhodopsin (visual purple) is a photopigment in rod cells consisting of opsin and retinal (from vitamin A). It bleaches upon absorbing light, initiating signal transduction for vision in low light. Cone cells contain iodopsin for color vision. Melanin is skin pigment, hemoglobin carries oxygen.
Explanation:
The Smooth Endoplasmic Reticulum (SER) lacks ribosomes on its surface and is primarily involved in the synthesis of lipids, including sterols and phospholipids. In liver cells, SER also plays a crucial role in the detoxification of poisons and drugs. Rough ER, which has ribosomes, is responsible for protein synthesis.
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