What is the primary role of the pollen tube?

Deliver sperm cells toward the ovule

What is the main role of the shoot apical meristem during vegetative growth?

Producing new shoot tissues and leaf primordia

Why are climacteric fruits often harvested before full ripeness for transport?

They can continue ripening after harvest under suitable conditions

They stop all metabolism at harvest

They cannot respond to ethylene

Which is the most direct benefit of ABA-induced stomatal closure?

Reduced transpirational water loss

Increased transpiration without limit

What does the term florigen refer to?

A pollen incompatibility allele

Which hormone balance often favours root formation in tissue culture?

Relatively high auxin compared with cytokinin

Which statement best describes sporophytic self-incompatibility?

Compatibility is determined by the diploid genotype of the pollen-producing parent

Compatibility depends only on the pollen grain's haploid genotype

It is caused by fruit softening

Which statement best describes gametophytic self-incompatibility?

Compatibility is determined by the haploid genotype of the pollen grain

Compatibility is determined only by fruit colour

It occurs only after fruit ripening

Which change can contribute to sweetness during ripening in many fruits?

Conversion of stored carbohydrates into soluble sugars

Conversion of all sugars into DNA

Complete loss of soluble carbohydrates

What is a likely effect of habitat loss on pollination?

Reduced nesting and feeding resources for pollinators

Guaranteed increase in pollinator diversity

Immediate formation of extra anthers

Why should growth regulators be applied at recommended doses?

Dose and developmental stage affect responses and off-target risks

All concentrations have identical effects

Every crop has identical sensitivity

What is the main difference between floral induction and floral initiation?

Induction is physiological commitment; initiation is visible floral meristem/organ development

They are exactly the same event

Initiation happens only after fruit ripening

Induction refers only to root growth

Which best describes the primary function of an apical meristem?

Lengthwise growth of roots and shoots

What does 'bolting' describe?

Rapid elongation of the flowering stem

Which statement about auxin and gravitropism is correct?

Auxin redistribution can cause differential elongation across an organ

Auxin is unrelated to directional growth

Auxin converts roots into pollen

Auxin always has the same effect at every concentration

Which storage practice can slow ripening in many fruits when properly managed?

Keeping all fruit in direct sun

Which process occurs after compatible pollen lands on a receptive stigma?

Pollen germination and pollen-tube growth may follow

The flower immediately becomes a root

The fruit necessarily ripens instantly

Plant Growth, Development and Reproduction — Quiz 4 of 4

Part 4 of 4 in the 200-question Plant Growth, Development and Reproduction series. This quiz contains questions 151–200 from the original quiz, with original question order, answer keys and explanations preserved where supported. Suggested time: 45 minutes.

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