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=>ANSWER: food/ food resources/ adequate food/ adequate food resources

28. 
    Plants that flower when days are long often depend on ¼. to help them reproduce.
    

Keywords: plant, long, depend, reproduce

In paragraph 4, the writer states: “Long-day plants are adapted for situations that require fertilization by insects, or a long period of seed ripening”.

=>ANSWER: insects/ fertilization by insects

28. 
    Desert annuals respond to … as a signal for reproduction.
    

Keywords: desert annual, signal, reproduction

In paragraph 4, the writer states: “Day-neutral plants have an evolutionary advantage when the connection between the favourable period for reproduction and day length is much less certain. For example, desert annuals germinate, flower and seed whenever suitable rainfall occurs, regardless of the day length”

+ a signal for reproduction = germinate, flower and seed

=>ANSWER: rainfall/ suitable rainfall

28. 
    There is no limit to the photosynthetic rate in plants such as¼ Keywords: no limit, photosynthetic rate
    

In paragraph 6, the writer states: ” Some plants reach maximum photosynthesis at one quarter full sunlight, and others, like sugarcane, never reach maximum, but continue to increase photosynthesis rate as light intensity rises.”

+ no limit = never reach maximum

=>ANSWER: sugarcane

28. 
    Tolerance to shade is one criterion for the¼¼.of plants in forestry and horticulture.
    

Keywords: tolerance to shade, criterion, forestry, horticulture.

In paragraph 7, the writer states: “Plants in general can be divided into two groups: shade-tolerant species and shade-intolerant species. This classification is commonly used in forestry and horticulture.”

=>ANSWER: Classification