19. Regarding the cellular specialization and physiological adaptation of cyanobacteria, some filamentous cyanobacteria differentiate into which of the following specialized cells to perform nitrogen fixation while simultaneously carrying out photosynthesis? (These cells maintain a low-oxygen internal environment by lacking Photosystem II).
(A) Akinete
(B) Heterocyst
(C) Endospore
(D) Vegetative cell

20. Plants can also generate action potentials similar to those in animals for rapid responses, such as the closing of a Venus flytrap. This change in electrical potential is primarily driven by the transmembrane movement of which two ions? (A) Sodium (Na⁺) and Potassium (K⁺) (B) Calcium (Ca²⁺) and Potassium (K⁺) (C) Chloride (Cl⁻) and Hydrogen (H⁺) (D) Magnesium (Mg²⁺) and Sodium (Na⁺)

21. Regarding the seed structure of gymnosperms, what is the origin and ploidy of the "endosperm" that provides nutrients for embryo development? (A) Produced by double fertilization, triploid (3n) (B) Developed from maternal sporophyte tissue, diploid (2n) (C) Developed from female gametophyte tissue, haploid (1n) (D) Developed from male gametophyte tissue, haploid (1n)

22. In the transport mechanism of vascular plants, "phloem loading" often requires energy. By what mechanism do companion cells primarily transport sucrose against its concentration gradient into the cell? (A) Using an ATP-driven sucrose uniporter (B) Relying on a Na⁺/sucrose symporter (C) Using an H⁺/sucrose symporter driven by a proton (H⁺) gradient (D) Through osmotic traction by aquaporins

23. When a plant grows in the shade of other plants, it exhibits the "shade avoidance syndrome," which promotes rapid internode elongation. This occurs because of what change in the environmental light spectrum? (A) The proportion of blue light increases, activating cryptochromes. (B) The Red/Far-red (R/FR) ratio decreases, leading to a reduction in the physiologically active Pfr form of phytochrome. (C) Ultraviolet (UV-B) radiation increases, destroying auxin. (D) The Red/Far-red (R/FR) ratio increases, leading to an increase in the Pr form of phytochrome.

24. During cellular respiration in plant cells, where does the citric acid cycle (Krebs cycle) occur? (A) Mitochondrial matrix (B) Inner mitochondrial membrane (C) Cytosol (D) Chloroplast stroma

25. In the classification of angiosperm fruits, a pineapple develops from the fusion of the sepals, petals, and ovaries of many flowers within an entire inflorescence. This type of fruit is called a: (A) Aggregate fruit (B) Simple fruit (C) Multiple fruit (D) Accessory fruit

26. The "cyclic electron flow" in photosynthesis involves only Photosystem I. What is the primary physiological significance of this process? (A) To increase the production of NADPH for use in the Calvin cycle. (B) To produce additional ATP, meeting the Calvin cycle's demand for ATP, which is greater than its demand for NADPH. (C) To promote the splitting of water molecules to release more oxygen. (D) To directly fix carbon dioxide into 3-phosphoglycerate (3-PGA).

27. Regarding the "gene-for-gene hypothesis" in the plant immune system, which of the following conditions must be met for a plant to successfully recognize and trigger a defense response against a specific pathogen? (A) The plant has a dominant resistance (R) gene, and the pathogen has the corresponding avirulence (Avr) effector gene. (B) The plant lacks an R gene, and the pathogen has an Avr gene. (C) The plant has an R gene, and the pathogen lacks an Avr gene. (D) Neither the plant nor the pathogen expresses any defense or pathogenic genes.

28. The leaves of submerged or floating plants have adapted to aquatic environments. Taking the floating leaf of a water lily as an example, what is the distribution characteristic of its stomata? (A) Stomata are primarily distributed on the lower (abaxial) epidermis. (B) Stomata are primarily distributed on the upper (adaxial) epidermis. (C) The stomatal density is roughly the same on both the upper and lower epidermis. (D) It has no stomata at all.

29. As a tree undergoes secondary growth, the xylem in the center of the trunk gradually loses its water-conducting function, accumulates decay-resistant substances, and darkens in color. This central part is called: (A) Sapwood (B) Heartwood (C) Earlywood (D) Latewood

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