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#growth

3 public questions tagged with this topic.

BOTANY

Which statement regarding pollen tube growth is correct?

Calcium ions and attractant peptides (like LURE) secreted by synergid lls guide the pollen tube toward the embryo sac. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -

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Microbial Physiology

Which environmental factor does NOT directly affect bacterial growth?

Bacterial growth responds strongly to physicochemical factors directly influencing enzyme catalysis, membrane fluidity and solute transport. Temperature governs rate constants via Arrhenius and protein denaturation, pH alters active site ionization and magnitude of proton motive force used for ATP synthesis, water activity and osmotic pressure control turgor needed for elongation, oxygen concentration determines whether aerobic respiration with oxygen as electron acceptor, anaerobic respiration with nitrate, or fermentation dominates energy metabolism. Light intensity unlike in phototrophic cy

Ref: Prescott's Microbiology, 11th ed., Chapter 7: Environmental Factors Affecting Growth and Light Intensity.

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