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anyanavicka [17]
3 years ago
9

Which plant has a visible leaf modification that will help it conserve water in extremely dry environments?

Biology
2 answers:
ioda3 years ago
3 0

its a cactus! the cactus stores water and when its really hot it conserves water!

Mariana [72]3 years ago
3 0

Answer: cactus

Explanation:

Cactus has modified visibily leaves called spine. These spines help and protect cactus from human and animal harm and also reduce the water loss from the cactus stem. When there is less rain the roots spread out and store water in the stem.

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How could the botanist best determine whether the genotype of the green-pod plant is homozygous or heterozygous?
murzikaleks [220]

Answer:

C

Explanation:

Homozygosity is when the two alleles (gene form) are the same while heterozygosity is when the alleles are of different types.

In a gene, an allele is capable of masking the expression of another. The allele being expressed or that masks is called the DOMINANT allele while the allele being masked is the RECESSIVE allele.

A recessive allele will only be expressed (phenotypically) if the two alleles are of the same type i.e. homologous but when a dominant phenotype is expressed, one cannot ascertain whether the organism is heterozygous or homozygous for that gene. e.g T is the gene coding for height in plant, T which represents tallness is dominant over t, representing shortness. In a heterozygous (Tt) and homozygous dominant (TT) state, the plant will be phenotypically tall but will only be short in a homozygous recessive (tt) state.

Since the plant will be tall in homozygous (TT) or heterozygous (Tt), we cannot detect the actual genotype of the plant. Hence, a test cross is done.

A test cross is a cross between a dominant phenotype and a homozygous recessive in order to determine the actual genotype of the dominant organism i.e. whether homozygous or heterozygous.

In this case involving pod color gene, since the botanist is trying to determine whether the genotype of the green pod plant is heterozygous or homozygous, it means the allele for green pod is dominant over that of yellow pod (recessive).

N.B: The recessive trait can only be expressed if it is homozygous. Therefore, the yellow pod plant has homozygous recessive genotype.

A test cross is conducted by the botanist to determine whether the green pod plant is heterozygous or homozygous by crossing it with a yellow pod plant (homozygous recessive).

If any of the offspring plants exhibit recessive traits i.e. yellow pods, it means the parent green pod plant is heterozygous but if all the offspring plants show phenotypic dominant traits i.e green pod, it means the parent green pod plant is homozygous.

8 0
3 years ago
Description of change 2011 japan tsunami
Vinvika [58]
2011 Tōhoku earthquake and tsunami<span>The 2011 earthquake off the Pacific coast of Tōhoku was a magnitude 9.0–9.1 undersea megathrust earthquake off the coast of Japan that occurred at 14:46 JST on Friday 11 March 2011, with the epicentre approximately 70 kilometres east of the Oshika Peninsula of Tōhoku and the hypocenter at an underwater depth of approximately 29 km. The earthquake is also often referred to in Japan as the Great East Japan earthquake and also known as the 2011 Tōhoku earthquake, and the 3.11 earthquake. It was the most powerful earthquake ever recorded to have hit Japan, and the fourth most powerful earthquake in the world since modern record-keeping began in 1900. The earthquake triggered powerful tsunami waves that reached heights of up to 40.5 meters. got from Wikipedia, need anything else let me know</span>
4 0
2 years ago
Read 2 more answers
During which change is heat energy absorbed?
nevsk [136]
Heat energy is absorbed when boiling point comes
6 0
2 years ago
Each of the following complications listed below is a result of a homeostatic calcium imbalance. Which would not be life threate
mihalych1998 [28]

Answer:

The correct option is number 3.  A deficit of appositional bone growth would not be life threatening.

Explanation:

Appositional bone growth can be defined as the thickening of the bones due to increase in the number of bone tissues at the surface. In this kind of bone growth, the diameter of the bone increases rather than the length of the bone. This can lead to deformation of the bone but it is not life-threatening.

Rest of the options 1, 2 and 3 are serious disorders and can eventually lead to death.

3 0
3 years ago
Long-term activation by nuclear receptors differs from the more transient membrane receptor signaling for what reason
Rama09 [41]
I have no idea but i think because long term activation is long term rather than nuclear. this is wrong
6 0
2 years ago
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