A hormone induced dropping of leaves, flowers

10 Jun A hormone induced dropping of leaves, flowers

Question
Plants

This is for review only. Thank you.

A hormone induced dropping of leaves, flowers, fruits or other parts of a plant is:

A. Abscission

B. Petiolaria

C. Assimilation

D.Pollination

A seed leaf is a:

A. seed

B. cotyledeon

C. monocot

D. leaf primordia

The fusion of a sperm nucleus with the egg nucleus and the fusion of another sperm nucleus with the nuclei of the endosperm is:

A. fertilization

B. pollination

C. transpiration

D. translocation

A mature ovary, with or without accessory parts is a:

A. root

B. fruit

C. flower

D. seed

Resumption of growth after dispersal, dormancy, or both is called:

A. germination

B. abscission

C. transpiration

D. translocation

The enlarged base of one or more carpels is the :

A. ovary

B. fruit

C. stigma

D. style

The tissue mass in a plant ovary that develops into a seed is the:

A. ovule

B. pollen

C. petiole

D. stigma

Immature or mature, sperm bearing male gametophyte of a Gymnosperm or Angiosperm is a :

A. pollen grain

B. ovule

C. anther

D. stamen

Arrival of a pollen grain on the landing platform (Stigma) of a carpel is called:

A. fertilization

B. pollination

C. transpiration

D. translocation

A mature ovule with an embryo sporophyte inside and integuments that form a seed coat is a :

A. ovule

B. megaspore

C. seed

D. pollen grain

Cells in sacs in the anthers undergo meiosis and cytoplasmic divisions to produce haploid _____________ ,which go on to become pollen grains.

A. megaspores

B. microspores

C. mother cells

D. gerbels

The flowers of species that have both male and female parts are called ______________ flowers.

A. complete

B. perfect

C. common

D. real

Plants exhibit _____________ when they turn their leaves or stems toward the light.

A. phototropism

B. photoauxin

C. light dependency

D. lightdays

What is the name of the blue-green pigment molecule that is one of the “alarm buttons” for some biological clocks in plants?

A. hirudin

B. xanthophyll

C. chlorophyll

D. phytochrome

A________________ rhythm is a biological activity that recurs in cycles of 24 hours or so.

A. circadian

B. biological

C. dermatome

D. hourly

What plant hormone is redistributed within a plant to cause the bending of plants in response to light?

A. giberrelins

B. auxin

C. photons

D. xanthophylls

Generally, gravity-sensing mechanisms are based on _________ which are heavy or dense particles that shift position in response to changes in a cell’s orientation in space.

A. statocysts

B. statolyths

C. gravotrips

D. stones

Tendrils display ____________ when they shift their direction of growth upon contacting a solid object.

A. phototropism

B. gravitropism

C. touhotropism

D. thigmotropism

Generally, gravity-sensing mechanisms are based on

a. phytochrome inactivation

b. statolith movement

c. accumulation of ethylene

d. differential gene expression

A perfect flower

a. lacks a stamen

b. lacks a carpel

c. has both male and female reproductive parts

Double fertilization occurs only in

a. tissue cultures

b. angiosperms

c. monocots

d. dicots

When plants shift their growth in response to contact with an object, they show

a. gravitropism

b. thigmotropism

c. photoperiodism

d. phototropism

Which of the following statements about endosperm is not correct?

a. it is formed in the stamens

b. it is triploid

c. it serves as nutrition for the embryo

d. it is present only in angiosperms

A poinsettia, which must be guarded from excess light in order to induce flowering, is an example of a

a. day-neutral plant

b. short-day plant

c. long-day plant

A(n) ______ is a multiple fruit; it is derived from a number of individual flowers that were grouped close together.

a. apple

b. strawberry

c. pineapple

d. acorn

When a plant stops growing under conditions that seem (to us) suitable for growth, we say that it has entered into :

a. senescence

b. dormancy

c. abscission

d. germination

Which of the following promotes fruit ripening and abscission?

a. indolacetic acid (IAA)

b. gibberellins

c. ethanol

d. none of the above

Phytochrome :

a. is a blue-green plant pigment

b. is interconverted between active and inactive forms by variations in the wavelength of light

c. plays a role in maintaining plant circadian rhythms

d. all of the above

Which of the following is not a fruit?

a. banana

b. tomato

c. potato

d. hazelnut

What plant pigment is suspected of playing a major role in phototropic bending?

a. phytochrome

b. chlorophyll

c. flavoprotein

d. phycobilin

The “foolish seedling” effect results from exposure of a plant to an artificially high level of

a. auxin

b. phytochrome

c. ethylene

d. gibberellin

Indolacetic acid (IAA) is a naturally occurring

a. auxin

b. pigment

c. gibberellin

d. cytokinin

In ______, a new plant is induced to arise from a parent cell that has not become irreversibly differentiated.

a. parthenogenesis

b. genetic engineering

c. tissue culture propagation

d. sexual reproduction

Strawberries can reproduce vegetatively by

a. parthenogenesis

b. runners

c. rhizomes

d. tubers

In ______, the embryo absorbs nutrients from the endosperm and stores them in its cotyledons.

a. corn

b. wheat

c. rice

d. cherries

A ______ is a localized region of still embryonic cells that retain the potential for division.

a. cotyledon

b. corm

c. meristem

d. bulb

When a pollen tube reaches an ovule, it penetrates the embryo sac and delivers

a. a single sperm

b. two sperm

c. the endosperm mother cell

d. an egg

Abscisic acid

a. is a type of auxin

b. promotes cell elongation

c. induces bud dormancy

d. causes the foolish seedling effect

Cytokinins

a. are responsible for circadian rhythms

b. stimulate cell division

c. are synthesized in leaves and transported to roots

d. are activated by red light

Food distributors expose fruit to ethylene in order to

a. retard spoilage

b. kill insects

c. promote ripening