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lemonswan548Lv1

29 Sep 2019

I grow sunflowers in my garden for several years now and it alwaysfollow sunrise from east to west each day, but what I would like toknow is, do they slowly unwind during the night so that at sunrisethey

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Lelia LubowitzLv2

29 Sep 2019

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*5. Margaret is studying a population of sunflowers that are genetically variable in a controlled lab setting. She measures the mean and variance of seed set on 1000 individuals. The phenotypic variance in seed number is 30. She picks one plant to self-pollinate and produces 200 genetically identical progeny. The phenotypic variance in seed number in these progeny is 20. Use this information to answer the questions below.

A. Calculate the broad-sense Heritability (H²)

B. What does the broad-sense heritability value tell you about the role of genetics and environment on phenotypic variance in seed number?

C. Margret has decided to leave academia and become a lawyer. She has also decided to bring her sunflowers with her and plant them in her garden. She repeats the experiment described above in her yard, and calculates an H² for seed set to be 0.90. Give two reasons why it is not surprising that this value is different from the one in part A.

D. Researchers determine that the narrow-sense heritability (h²) of seed set in sunflowers is 0.50. These researches undertake a project to increase the number of seeds produced by each plant. The mean number of seeds is currently 75. Plants with a mean of 100 seeds are interbred as parents of the next generation. What mean number of seeds can be expected in this generation?

E. If the narrow-sense heritability in sunflowers is 0.50 how do you explain how Margret calculated an H² of 0.90 for seed set in her garden?

azureporcupine79

Explain your answers, please.

Fire is a common occurrence in prairie grasslands. What do you think would happen to a grassland area if fire were excluded for many decades?

A. some trees would slowly begin to appear.

B. there would be no change.

C. it would become a desert.

D. it would slowly turn into a tropical rainforest

If you examine plant life in a very arid place like deathvalley, you may find some herbaceous desert plants that do not have any anatomical features for water conservation. How would you expect this as someone who has studied botany?

A. they absorb moisture from the atmosphere during night

B. they can grow with very little available water.

C. they can exist and grow for long periods on stored water.

D. they complete life cycle within the short time there is sufficient moisture.

E. they use crassulacean acid metabolism pathway

Which of the following is a difference between a prairie grassland and a savanna grassland?

A. Prairie soils are rich in nutrients
B. Savannas have provided some of the most productive agricultural lands.
C. Prairies support an immense population of animals.
D. Savannas have scattered tall trees

Chlorophyll is a pigment that absorbs specific wavelengths of light, and the absorption of that light leads to the passage of electrons to a higher energy state, where chemical energy can then be harvested from them. You would expect that a plant exposed to which color of light would produce the most photosynthesis?

Which color of light would you expect chlorophyll to absorb the least?

Most plants are green because....

chlorophyll absorbs green light well

chlorophyll does not absorb green light well

chlorophyll reflects green light well

both of the last two answers are correct

Thinking about the gases involved in respiration and photosynthesis, during the day, a plant is producing____ from respiration and releasing_____ from photosynthesis. But at night, a plant is only producing_______ from respiration.(spell your answers out completely).

Plants perform cellular respiration to produce.......

Which of the following is true about plants and cellular respiration?

plants perform cellular respiration only during the night

plants perform cellular respiration only during the day

plants perform cellular respiration during the night and day

plants do not perform cellular respiration

Which of the following is true regarding plants and photosynthesis?

plants perform photosynthesis only during the night