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il63 [147K]
3 years ago
15

When a seed germinates, its root grows downward in response to gravity. This is called _______. A. thigmotropism B. negative tro

pism C. gravitropism D. phototropism
Biology
1 answer:
Alexeev081 [22]3 years ago
5 0
Gravitropism is your answer. 
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You discover a new type of gland associated with the skin. Chemical analysis of the product shows a secretion has a pH of 4, con
vagabundo [1.1K]
<h2>A) option is correct </h2>

Explanation:

Skin has two types of sweat glands: eccrine and apocrine

Eccrine glands occur over most of the body and open directly onto the surface of skin whereas apocrine glands open into the hair follicle, leading to the surface of the skin and develop in areas abundant in hair follicles, such as on scalp, armpits and groin

The eccrine gland is controlled by the sympathetic nervous system and regulates body temperature

In some animals, when internal temperature rises the eccrine glands secrete water to the skin surface, where heat is removed by evaporation

Eccrine glands when active are considered major thermoregulatory devices

Smaller mammals, such as rodents, cannot endure dehydration and hence possess no eccrine glands at all

3 0
3 years ago
What are the most likely percentages for offspring of two red/white-feathers parents?
weeeeeb [17]

Answer:

The question lacks options, the options are:

parents?

A.100% red/white-feather chickens.

B.50% white-feather chickens and 50% red/white-feather chickens.

C.33% white-feather chickens, 33% red-feather chickens, and 33% red/white-feather chickens.

D.25% white-feather chickens, 25% red-feather chickens, and 50% red/white-feather chickens

The Correct answer is D

Explanation:

According to the question, the hybrid chicken has a mixture of red and white feather phenotypes expressed at the same time. This tells us that the red and white alleles are CODOMINANT in the chicken i.e. none is dominant or recessive over the other.

Let's assume that (R) allele is the red feather colour while (r) allele is for white feather colour. Therefore, the red/white feathered chicken will have a Rr genotype. In a cross between two red/white feathered chicken (Rr), the following offsprings will be produced RR, Rr, Rr and rr

RR- Homozygous red feather d chicken (1/4 × 100=25%)

Rr- Hybrid Red/White feathered chicken (2/4 × 100=50%)

rr- Homozygous white feathered chicken (1/4 × 100=25%)

8 0
2 years ago
What heat source should you use to heat flammable organic solvents?
Fynjy0 [20]
Many organic compounds are ignitable, putting them in direct flame may cause fires or combustion. it is possible to start a fire on a hot plate, but typically hot plates are not heated as high and the temperature is somewhat controll-able... you can not control the temperature of a bunsen burner very easily i would not through acetone or ethanol on a hot plate, as it can catch on fire or cause burns, but it's much worse with the bunsen burner.
7 0
3 years ago
scientists have discovered several species of insect that all contain the same DNA sequence on their second chromosome. What doe
Zinaida [17]
It could be a common ancestry among organisms.
8 0
3 years ago
Why do enzymes lose their function when they are subjected to extreme temperature changes?
11111nata11111 [884]

It's A. Temperature changes modify the enzyme shape, so they no longer fits.

4 0
3 years ago
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