Deck 13: Plant Life Cycle and Development

Question 1

Which of the following is not true of the first cell division of a plant embryo?

A) It establishes the apical-basal axis of the plant
B) It gives rise to a suspensor
C) It is parallel to the long axis
D) It gives rise to a proembryo

Answer 1

C

Question 2

At which stage do cotyledons start to develop wing-like structures?

A) Heart stage
B) Globular stage
C) Octant stage
D) Triangular stage

Answer 2

A

Question 3

Which of the following is not true of auxin?

A) Auxin functions as a diffusible extracellular signaling factor
B) It establishes the apical-basal axis
C) It is actively transported from the basal cell into the apical cell
D) The concentration gradient of auxin is necessary for specifying different cell fates

Answer 3

A

Question 4

Which of the following is not a correct interpretation of a differentiated somatic cell's ability to regenerate a new plant?

A) Maternal determinants are of little or no importance for plant embryogenesis
B) The fate of many cells in the adult plant body is not fully determined
C) This opens up avenues for creating transgenic plants
D) Many adult plant cells have lost their potential

Question 5

Which of the following is the type of meristem of the axillary bud near the base of a leaf?

A) Shoot apical meristem
B) Lateral shoot meristem
C) Inflorescence meristem
D) Floral meristem

Question 6

A diffusible inhibitor emanating from the shoot apex inhibits the development of lateral buds below the apical bud. What is this inhibitory effect called?

A) Lateral inhibition
B) Apical dominance
C) Lateral dominance
D) Apex inhibition

Question 7

What is the name of the slowly dividing, self-renewing stem cells of the central zone within a meristem?

A) Centrals
B) Peripherals
C) Initials
D) Apicals

Question 8

Which of the following axis is represented by the line between the leaf base to the leaf tip?

A) Proximo-distal
B) Adaxial-abaxial
C) Apical-basal
D) Dorso-ventral

Question 9

Which of the following is not true of homeotic floral mutations in Arabidopsis?

A) One class of mutants affect whorls 1 and 2
B) One class of mutants affect whorls 3 and 4
C) One class of mutants affect whorls 2 and 3
D) One class of mutants affect whorls 1 and 4

Question 10

What kinds of proteins do floral organ identity genes encode?

A) Intercellular signaling ligands
B) Cell-adhesion proteins
C) Cell-surface receptors
D) Transcription factors