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xxMikexx [17]
3 years ago
12

Crop rotation is a method of soil conservation because _______. a. the land produces more than one type of crop b. it requires p

lowing and tilling that reduces soil compaction c. it does not use the same parcel of land in sequential seasons d. it avoids the depletion of soil nutrients
Biology
2 answers:
katen-ka-za [31]3 years ago
5 0

Short answer:

I believe option D (all of the above) is correct.

Liula [17]3 years ago
3 0

Answer:

d. It avoids the depletion of soil nutrients.

Explanation:

Crop rotation is the process of planting different crops in the same area of land in rotation. This allows the breathing of the soil as well as the retention of nutrients in the soil.

<u>Crop rotation is one form of conserving soil as it helps in saving the nutrients of the soil from getting depleted.</u> As different crops require different nutrients, the change in crop plantation between different types of crops help in maintaining the fertility of the land. This way, when crops are planted in rotation, there is also the rotation of the different nutrients required for the different crops planted, thus allowing the cycle of nutrient change to take place.

Thus, the correct answer is option d.

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Which type of mutation occurs only in gametes?
vazorg [7]

Answer:

germ line mutation

3 0
3 years ago
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Describe spider plant (physical appearance, habitat, function, history, etc.).
VMariaS [17]

The spider plant forms mounds of narrow leaves. While spider plants with all green leaves can be found, these are the rarest variety. Most commonly, spider plants are found with a white or yellow stripe down the center of the leaves. grows in soutjern africa habitat is 80 degrees or more not past 100 dregrees thoe. Also called ribbon plant. a plant, Chlorophytum comosum, of the lily family, native to southern Africa, that has long, narrow leaves and clusters of white flowers and is widely cultivated as a houseplant.

4 0
3 years ago
The human MN blood type is determined by two codominant alleles, L(M) and L(N). The frequency of L(M) in Eskimos on a small Arct
tatiyna

Answer:

(a) Frequency of M = 0.64

    Frequency of N = 0.04

    Frequency of MN= 0.32

(b)  Expected frequencies of M = 0.648

     Expected frequencies of MN = 0.304

     Expected frequencies of N =  0.048

Explanation:

(a) If random mating takes place in the population, then  the expected frequencies are

f(L(M)) = p = 0.8

F(L(N)) = q

q= 1 - p

= 1 - 0.8

= 0.2

Frequency of M = p^2 = ( 0.8)^2 = 0.64

Frequency of N = q^2 = (1-p)^2 = (1 - 0.8)^2 = (0.2)^2 = 0.04

Frequency of MN = 2pq = 2 * 0.8 * 0.2 = 0.32

(b)

F = inbreeding coefficient = 0.05

f(L(M)L(M)) = p^2 + Fpq = (0.8)^2 + 0.05 * 0.8 * 0.2 = 0.648

f(L(M)L(N)) = 2 pq - 2Fpq = 2 * 0.8 * 0.2 - ( 2 * 0.05 * 0.8 * 0.2) = 0.304

f(L(N)L(N)) = q^2 + Fpq = (0.2)^2 + ( 0.05 * 0.8 * 0.2) = 0.048

5 0
2 years ago
In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If a red-eyed heterozygous f
ladessa [460]
The answer is Rr and rr.

We know:
r - recessive allele
R - dominant allele
RR - dominant homozygote with red eyes
Rr - heterozygote with red eyes (since one dominant allele R can mask recessive allele r)
rr - recessive homozygote with sepia eyes

Heterozygote Rr can give to the offspring either dominant allele R or recessive allele r. Recessive homozygote rr can give to the offspring only recessive allele r (take a look at the uploaded image of Punnett square).
After crossing the parents:
Parents:        Rr    x     rr
Offspring:  Rr    rr    Rr    rr

So:
2 out of 4 offspring will be with heterozygous with red eyes Rr: 2/4 = 0.5 = 50%
2 out of 4 offspring will be with homozygous with sepia eyes rr: 2/4 = 0.5 = 50%

8 0
3 years ago
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Why are lipids important for survival of animals
mrs_skeptik [129]

Answer:

Lipids play an important role in storing energy. If an animal eats an excessive amount of energy it is able to store the energy for later use in fat molecules. Fat molecules can store a very high amount of energy for their size which is important for animals because of our mobile lifestyles.

Explanation:

8 0
2 years ago
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