In a typical angiosperm, the male gametophyte is the:
A. Endosperm
B. Pollen grain
C. Embryo sac
D. Ovule
Answer: Option B
Solution (By JKSSB Mock Tests)
The pollen grain contains the male gametophyte, which produces two sperm cells. The ovule contains the female gametophyte (embryo sac). Endosperm is the triploid nutritive tissue formed after double fertilization.
Explanation:
Glycolysis, the breakdown of glucose to pyruvate, occurs in the cytoplasm of cells. The Krebs cycle and oxidative phosphorylation occur in mitochondria.
Explanation:
Photosynthesis converts light energy into chemical energy (glucose) using CO₂ and H₂O, releasing O₂. It occurs in chloroplasts. Respiration breaks down glucose, fermentation is anaerobic, chemosynthesis uses chemical energy.
Consider statements about plant biology: 1. Xylem transports water upwards. 2. Phloem transports food bidirectionally. 3. Cambium is responsible for secondary growth. Which are correct?
Explanation:
Xylem is the vascular tissue responsible for the unidirectional upward transport of water and dissolved minerals from the roots to the aerial parts of the plant. Phloem is the vascular tissue responsible for the translocation of organic nutrients (primarily sucrose) from sources to sinks, which can be bidirectional (up or down depending on the plant's needs). Cambium (vascular and cork) is a lateral meristem responsible for secondary growth, which is the increase in the girth or thickness of stems and roots. All statements are correct.
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