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TLS Online TPP Program

#Question id: 4650

DDT was once considered a ʺsilver bulletʺ that would permanently eradicate insect pests. Today, instead, DDT is largely useless against many insects. Which of these would have been required for this pest eradication effort to be successful in the long run?

#Unit 11. Evolution and Behavior

  1. Larger doses of DDT should have been applied.

  2. All habitats should have received applications of DDT at about the same time.

  3. The frequency of DDT application should have been higher.

  4. None of the individual insects should have possessed genomes that made them resistant to DDT.

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TLS Online TPP Program

#Question id: 10421

#Unit 6. System Physiology – Plant

The red light-induced rotation of the D ring of the chromophore causes the hairpin to become helical, which of the following β-hairpin changes conformation after rotation?
TLS Online TPP Program

#Question id: 10422

#Unit 6. System Physiology – Plant

Arabidopsis contains five genes encoding phytochromes, PHYA–PHYE, four of the five phytochromes appear mostly light-stable in the plant and function primarily in the regulation of LFRs and of shade avoidance involving changes in the R:FR ratio.
TLS Online TPP Program

#Question id: 10423

#Unit 6. System Physiology – Plant

Which of the following responses include processes such as the promotion of lettuce seed germination, inhibition of hypocotyl elongation, and regulation of leaf movements?
TLS Online TPP Program

#Question id: 10424

#Unit 6. System Physiology – Plant

Phytochrome responses fall into three major categories based on the amount of light they require, which one is not the category of phytochrome responses;
TLS Online TPP Program

#Question id: 10425

#Unit 6. System Physiology – Plant

Very low fluence responses such as 0.0001 µmol m–2 reach a maximum at about 0.05 µmol m–2, on these fluence rate red light induce phytochrome responses. Which of the following is not the phytochrome responses on VLFR
TLS Online TPP Program

#Question id: 10426

#Unit 6. System Physiology – Plant

low-fluence responses (LFRs) another set of phytochrome responses, which include;
a) It can be initiated when fluence reaches 1.0 µmol m–2, and they are saturated at about 1000 µmol m–2
b) promotion of lettuce seed germination
c) inhibition of hypocotyl elongation and regulation of leaf movements
d) It also inhibits the growth of the mesocotyl
Which of the following combinations is correct for LFRs?