Planet closest to Sun?
Mercury is closest to Sun.
Vitamin C deficiency causes?
Scurvy from Vitamin C deficiency.
Hardest natural substance?
Diamond = 10 on Mohs scale.
Gas causing global warming?
CO₂ is main greenhouse gas.
Ohm Law: V = ?
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Powerhouse of cell?
Mitochondria produces ATP.
Sound cannot travel through?
Sound needs medium, not vacuum.
Universal blood donor group?
O- has no antigens, universal donor.
Human body has how many bones?
Adult body has 206 bones.
Largest gland in human body?
Which of the following is the primary pigment responsible for absorbing light energy in the visible spectrum during photosynthesis?
Chlorophyll a is the primary photosynthetic pigment that absorbs light in the blue and red regions of the electromagnetic spectrum.
The pH of cell sap in plant cells typically ranges between:
Plant cell sap is slightly acidic due to organic acids like malic acid and citric acid, maintaining pH between 4-6.
Which element is essential for the synthesis of chlorophyll molecule and forms the central atom in its structure?
Magnesium (Mg) is the central atom in the chlorophyll molecule, forming a coordinate bond with the porphyrin ring.
The phenomenon where plants bend towards light source is governed by which hormone?
Auxin causes differential elongation of cells on the shaded side, resulting in phototropic response towards light.
In C4 plants, the first stable compound formed during carbon fixation is:
In C4 photosynthesis, CO2 combines with PEP (3-carbon) to form oxaloacetate (4-carbon compound) via the enzyme PEP carboxylase.
The root pressure phenomenon in plants can be measured using a device called:
Root pressure is measured using a manometer connected to the cut end of a plant stem, showing the positive pressure generated by roots.
Which of the following statements about stomatal opening is correct?
During stomatal opening, potassium ions (K+) actively accumulate in guard cells, increasing osmotic potential and causing water influx.
The phenomenon of leaf fall in deciduous plants before winter is regulated by which hormone?
Abscisic acid (ABA) accumulates during water stress and environmental changes, promoting abscission layer formation and leaf fall.
In plant tissue culture, which growth regulator ratio promotes callus formation?
High auxin to low cytokinin ratio promotes callus formation, while the ratios determine the type of organogenesis.
The osmotic potential of a solution is directly related to:
Osmotic potential (Ψs) = -iCRT, where it depends on solute concentration (C) and absolute temperature (T).
