Sieve elements of phloem conduct sugars and other organic materials throughout the plant. The following statements were made about characteristics of sieve elements in seed plants:

(a) Angiosperms contain sieve plant pores.

(b) There are no sieve plates in gymnosperms.

(c) P-protein is present in all eudicots and many monocots.

(d) There is no P-protein in angiosperms.

Which of the following combinations is correct?

• (b), (c) and (d)

• (a), (b) and (c)

• (a), (b) and (d)

• (a), (c) and (d)

The plant hormones, auxins and cytokinins, and their interactions play an important role in regulating apical dominance. The following figure represents an experiment related to the study of gene interactions that influence axillary bud outgrowth or dormancy. Q,Z and M represent genes involved in phytohormone pathway.

Based on the above figure, the following statements were made:

(a) 'X' is an auxin that maintains expression of 'Q' and 'Z' and represses 'M'.

(b) 'Y' is a cytokinin that promotes axillary bud growth and is induced by 'M'.

(c) Decapitation (removal of apex) activates 'X'.

(d) 'X' is a cytokinin that represses 'M'.

Which one of the following options reprsents correct statement(s)?

• (a) and (c) only

• (b) and (d) only

• (a) and (b) only

• (c) only

163.

Following table shows presences (+) and absences (-) of selected distinguishing characters of different plant taxa:

Based on the above, which of the following shows correct identity of taxa A,B, C and D?

• A-Hornworts; B-Oaks; C-Ferns; D-Pines

• A-Ferns; B-Oaks; C-Hornworts; D-Pines

• A-Hornworts; B-Pines; C- Ferns; D-Oaks

• A-Ferns; B-Pines; C- Hornworts; D- Oaks.

Completed the following sentences with the most appropriate option.

Global analysis of a larger number of plant species traits showed that with increase in leaf life spa.

• Specific leaf area increases whereas leaf nitrogen and net photosynthesis rate decrease.

• Specific leaf area, leaf nitrogen and net photosynthesis rate increase

• Specific leaf area, leaf nitrogen and net photosynthesis rate decrease.

• Specific leaf area decrease whereas leaf nitrogen and net photosynthesis rate increase.

Which of the following mineral deficiency  will first be visible in younger leaves?

• Calcium

• Nitrogen

• Zinc

• Molybdenum

The CO₂ compensation poibt for C₃ plants is greater than C₄ plants because in C₃ plants

• Dark respiration is higher

• Dark respiration is lower

• Photorespiration is present

• Photorespiration is absent

Which one of the following best describes the function of Casparian bands during the translocation of nutrients and water across the root?

• Block apoplastic nutrient transport

• Block symplastic nutrient transport

• Act as a nutrient carrier

• Help in creating passage cells

Which one of the following components is expected to be most abdundant in phloem sap of a plant?

• Proteins

• Organic acids

• Sugars

• Phosphates

Basal angiosperms are NOT represented by the members of:

• Chloranthales

• Nymphaeales

• Austrobaileyales

• Amborellales