Exam 40: Plant Reproduction

Endosperm tissue of angiosperms has what ploidy level?

You are a landscape architect working on the grounds of a large estate.After you plant a dozen trees,the owner says,"There's been a mistake.The flowers on some of these willow trees look totally different! I specifically asked for Salix alba.You must have planted two different species." You refer to your tree guide,and read: "Salix alba - species of willow native to Europe and Asia,noted for the white undersides of leaves.Insect pollinated,dioecious.Grows 10-30m tall." How do you respond to the client?

The developmental transition during which plants become able to respond to external and/or internal signals that promote flowering is known as

Which tissue can not divide to give rise to identical progeny in a plant that reproduces asexually?

Which of the following statements about the angiosperm embryo sac is FALSE?

What are the "seed leaves" that grow from bulges on the embryo called?

Oaks,birches and corn produce both staminate and pistillate flowers on the same plant.What term describes this type of plant?

Early seed plants were pollinated by ________,as are present-day conifers.

Dandelions develop seeds by apomixis.What benefits does this strategy provide over vegetative or sexual reproduction?

Scientists have confirmed by carbon dating that seeds dormant for up to 2000 years can successfully germinate.Based on the requirements for germination,what research expedition should you join in order to retrieve some ancient but viable seeds?

"Germination" can refer to two different events

If a pollen grain fails to generate two sperm cells,what is the most likely result of pollination?

A genus of primarily wind-pollinated plants includes one unusual species that has evolved to be pollinated by insects.Several morphological changes have accompanied this adaptation.The ________ are more colorful,there is a nectary at the base of the ________,the ________ are shorter and produce sticky pollen,and the ________ are stickier for enhanced pollen capture.

Which of these characteristics does not promote outcrossing in flowering plants?

A researcher is investigating the morphology of complete flowers.Which of the following organs must his flowers contain?

Germination requires the use of metabolic reserves in the seed.Which of these compartments contains starch used to fuel early seedling growth?

How could you monitor flower determination in a plant that is mutant for all three class E SEP genes?

One way to improve crop productivity is to modify flowering time.This can allow for multiple growing seasons in one year,and can also increase grain production because a smaller plant has lower resource needs.You are approached by an agricultural company that wants to create an early-flowering transgenic plant.Using your knowledge of Arabidopsis genetics,which genetic modifications would you suggest?

Interrupting the night with a flash of light can trigger flowering in a long-day plant.Why doesn't introducing a short period of darkness during the day cause a short-day plant to flower?

Place these statements in their proper sequence. Walking through the botanical garden with a friend,you spy a rare and beautiful variety of Hosta."Oh I would love to have one of those!" you exclaim."But they cost a king's ransom." Your friend smiles,snips off a tiny piece of the shoot,and says,"I'll grow you one.I'll just take it back to lab and... 1.use enzymes to break down the cell walls..." 2.grow up a callus..." 3.wait for somatic embryos to form..." 4.culture an individual plantlet for you..."