In the syncytial blastoderm, nuclei in the anterior part of the cell are exposed to ------------- that are not present in the posterior part of the cell, and vice versa.

1. Cytoplasmic determinants

2. Maternal factors

3. Zygotic gene

4. Paracrine signals

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?

TLS Online TPP Program

#Question id: 10427

#Unit 6. System Physiology – Plant

HIRs require prolonged or continuous exposure to light of relatively high irradiance, these HIRs induce phytochrome responses such as

a) Synthesis of flavonoids including anthocyanins

b) Inhibition of hypocotyl elongation in various plants

c) Induction of flowering and Plumular hook opening in lettuce

d) Enlargement of cotyledons in mustard

e) Production of ethylene in sorghum

Which of the following phytochrome responses induce by HIRs is correct?

TLS Online TPP Program

#Question id: 10428

#Unit 6. System Physiology – Plant

Match the following column given fluence with its induce phytochrome responses;

COLUMN A	COLUMN B
A) low-fluence responses (LFRs)	i) do not show Photoreversibility while Law of Reciprocity is followed
B)  high irradiance responses (HIRs)	ii) Shows the Photoreversibility and also the Law of Reciprocity is followed
C) Very low fluence response (VLFR)	iii) It will absorb red and blue light and responses is measuredly recepted by phytochrome A
	iv) In dark-grown: far red, blue, UV-A recepted by Photoreceptor phyA and cryptochrome
	v) ) It will absorb Red, far-red and responses is measurely recepted by phyB, phyD, phyE

Match the following combination with its correct responses;

TLS Online TPP Program

#Question id: 10429

#Unit 6. System Physiology – Plant

Which of the following given statements about PHYA is incorrect?

TLS Online TPP Program

#Question id: 10430

#Unit 6. System Physiology – Plant

Following are given some characteristics of Signals from Sunlight;

a) phyA is rapidly degraded as Pfr and controls plant responses to VLFRs and the far-red HIRs

b) An important role for phyB in de-etiolation

c) phyA must be the photoreceptor involved in the perception of continuous far-red light because its Pfr form is stable

d) Responses mediated by phyD and phyE include petiole and internode elongation and the control of flowering time

Which of the following combinations from the above statements is correct?

TLS Online TPP Program

#Question id: 10431

#Unit 6. System Physiology – Plant

The signal transduction pathways that lead to physiological or developmental responses, these responses fall into two general categories;

a) Ion fluxes, which cause relatively rapid turgor responses

b) the possible chain of events constituting the signal transduction pathways that bring about these effects

c) Altered gene expression, which typically results in longer-term responses

d) Gene expression altered shows short-term response

Which of the following combinations from above given general categories is true?