Consider the following statements about the plant root: 1. Root hairs increase absorption surface area. 2. The root cap protects the root tip. 3. The zone of elongation is responsible for root growth in length. Which of the above is/are correct? MCQ with Answer and Explanation
Consider the following statements about the plant root:
1. Root hairs increase absorption surface area.
2. The root cap protects the root tip.
3. The zone of elongation is responsible for root growth in length.
Which of the above is/are correct?
A. 1 and 2 only
B. 1, 2, and 3
C. 2 and 3 only
D. 1 and 3 only
Answer: Option B
Solution (By JKSSB Mock Tests)
All are correct: root hairs absorb water/minerals; root cap protects meristem; elongation zone extends the root.
Explanation:
The pituitary, located at the base of the brain, controls many endocrine glands via its hormones, earning the name 'master gland'. Insulin is from pancreas; it is connected to hypothalamus by infundibulum.
Explanation:
Vitamin B₁₂ contains a cobalt ion at the center of its corrin ring structure, hence the name cobalamin. It is essential for DNA synthesis and nervous system function. Iron is in heme, magnesium in chlorophyll, zinc in many enzymes. B₁₂ is unique in having a metal-carbon bond.
Explanation:
The adult human dental formula is 2123/2123 (incisors 2, canines 1, premolars 2, molars 3) per quadrant, totaling 32 permanent teeth. Deciduous teeth formula is 2102/2102 (20 teeth). The formula represents half of the upper jaw over half of the lower jaw. Wisdom teeth (third molars) may be absent in some individuals.
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