Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Chapter 21, Problem 2FTB
Plant adaptations to life on land include a(n) _______ which reduces evaporation of water, and _______, which open to allow gas exchange but close when _______ is scarce. In addition, the bodies of vascular plants gain increased support from _______ and _______ impregnated with the
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Students have asked these similar questions
What is the opening indicated by the pointer? (leaf x.s.)
stomate
guard cell
lenticel
intercellular space
none of these
Identify the indicated tissue? (stem x.s.)
parenchyma
collenchyma
sclerenchyma
○ xylem
○ phloem
none of these
Where did this structure originate from? (Salix branch root)
epidermis
cortex
endodermis
pericycle
vascular cylinder
Chapter 21 Solutions
Biology: Life on Earth
Ch. 21 - 1. Scientists hypothesize that the ancestors of...Ch. 21 - Plant adaptations to life on land include a(n)...Ch. 21 - 3. Seedless vascular plants must reproduce when...Ch. 21 - 4. Three groups of nonvascular plants are _______,...Ch. 21 - 1. What is meant by “alternation of generations”?...Ch. 21 - 2. Explain the evolutionary changes in plant...Ch. 21 - Describe evolutionary trends in the life cycles of...Ch. 21 - Prob. 4RQCh. 21 - List the structural adaptations necessary for the...Ch. 21 - The number of species of flowering plants is...
Ch. 21 - List the adaptations of gymnosperms that have...Ch. 21 - What is a pollen grain? What role has it played in...Ch. 21 - The majority of all plants are seed plants. What...Ch. 21 - You are a geneticist working for a firm that...Ch. 21 - 1. Prior to the development of synthetic drugs,...Ch. 21 - 2. Only a few hundred of the more than 200,000...
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- Identify the indicated tissue. (Tilia stem x.s.) parenchyma collenchyma sclerenchyma xylem phloem none of thesearrow_forwardIdentify the indicated structure. (Cucurbita stem l.s.) pit lenticel stomate tendril none of thesearrow_forwardIdentify the specific cell? (Zebrina leaf peel) vessel element sieve element companion cell tracheid guard cell subsidiary cell none of thesearrow_forward
- What type of cells flank the opening on either side? (leaf x.s.) vessel elements sieve elements companion cells tracheids guard cells none of thesearrow_forwardWhat specific cell is indicated. (Cucurbita stem I.s.) vessel element sieve element O companion cell tracheid guard cell none of thesearrow_forwardWhat specific cell is indicated? (Aristolochia stem x.s.) vessel element sieve element ○ companion cell O O O O O tracheid O guard cell none of thesearrow_forward
- Identify the tissue. parenchyma collenchyma sclerenchyma ○ xylem O phloem O none of thesearrow_forwardPlease answer q3arrow_forwardRespond to the following in a minimum of 175 words: How might CRISPR-Cas 9 be used in research or, eventually, therapeutically in patients? What are some potential ethical issues associated with using this technology? Do the advantages of using this technology outweigh the disadvantages (or vice versa)? Explain your position.arrow_forward
- You are studying the effect of directional selection on body height in three populations (graphs a, b, and c below). (a) What is the selection differential? Show your calculation. (2 pts) (b) Which population has the highest narrow sense heritability for height? Explain your answer. (2 pts) (c) If you examined the offspring in the next generation in each population, which population would have the highest mean height? Why? (2 pts) (a) Midoffspring height (average height of offspring) Short Short Short Short (c) Short (b) Short Tall Short Tall Short Short Tall Midparent height (average height of Mean of population = 65 inches Mean of breading parents = 70 inches Mean of population = 65 inches Mean of breading parents = 70 inches Mean of population = 65 inches Mean of breading parents = 70 inchesarrow_forwardP You are studying a population of 100 flowers that has two alleles at a locus for flower color, blue (B) and green (G). There are 15 individuals with the BB genotype, 70 individuals with the BG genotype, and 15 individuals with the GG genotype. (a) What are the allele frequencies of B and G in the starting population? Show your calculations. (2 pts) (b) Is this population in Hardy-Weinberg equilibrium? Show your calculations. (3 pts) 12pt v Paragraph BIU UA AV & VT2V f CO Varrow_forwardIn a natural population of outbreeding plants, the variance of the total number of seeds per plant is 16. From the natural population, 20 plants are taken into the laboratory and developed into separate true-breeding lines by self- fertilization-with selection for high, low, or medium number of seeds-for 10 generations. The average variance in the tenth generation in each of the 20 sets is about equal and averages 5.8 across all the sets. Estimate the broad-sense heritability for seed number in this population. (4 pts) 12pt v Paragraph BIUA V V T² v B ① O wordsarrow_forward
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