Chapter 5: Response in Plants

What is phytohormone?

• a type of plants fertilizer

• chemical substances that

  stimulate and coordinate responses in plants

• a type of stimulus for plants

Choose 2 correct characteristics on tropism response

• Responses are permanent

• It is a reversible response

• It is influenced by plants hormones

• It is a rapid response

Plants' response towards touch is known as..

• geotropism

• phototropism

• thigmotropism

• chomotropism

Response shown by the shoot of plant towards light is known as..

• negative phototropism

• positive phototropism

• positive geotropism

• negative hydrotropism

Response by Mimosa leaf towards touch is an example of..

• photonasty

• seismonasty

• nyctinasty

• thermonasty

Response of plants towards the changes of environmental temperature is known as...

• photonasty

• thigmonasty

• thermonasty

• nyctinasty

Thigmonasty is a response shown by...

• Venus fly trap

• Rafflesia

• Mimosa leaf

• Epiphytic plant

Nastic Movements are the plant responses towards environmental changes. Which of the following is an example of Nastic Movement?

• Plant producing flowers to attract insets

• Plant closing its leaves when the temperature drops

• Plant closing its leaves when touched

• Plant wilting due to temperature rises

Which of the following are phytohormones?

• Auxin

• Cytokinin

• Oxytocin

• Gibberellin

Phytohormone which is able to inhibit the growth of plants is..

• Abscisic acid

• Gibberellin

• Cytokinin

• Ethylene