How do leaves form? How are they attached to the plant?

1 answer:

8 0

Xylem: cells that bring water and minerals from the roots into the leaf. Phloem: cells that usually move sap, with dissolved sucrose(glucose to sucrose) produced by photosynthesis in the leaf, out of the leaf. A sheath of ground tissue made of lignin surrounding the vascular tissue. thats how leaves are made

Some leaves have a petiole, which attaches the leaf to the stem; leaves that do not have petioles are directly attached to the plant stem and are called sessile leaves. ... In an opposite leaf arrangement, two leaves connect at a node. In a whorled arrangement, three or more leaves connect at a node. thats how they r attach

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Where does first pass metabolism occur? / what route of administration is used to avoid complete first pass metabolism?

snow_tiger [21]

First pass metabolism of a drug is said to occur when the concentration of a drug that is administered orally is significantly reduced before it reaches the systemic circulation.
First pass metabolism usually occur in the liver.
The routes of drug administration that avoid complete first pass metabolism are: sublingual, transdermal, rectal and inhalation.

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3 years ago

The effect of the Y chromosome on gonadal sex determination is mediated by a gene called ___________

Sav [38]

Answer:

SRY

Explanation:

Sex determination in mammals including humans is genetically and hormonally controlled.

Genetically gonadal sex determination is mediated by a gene called SRY. This gene is known as the mammalian Y-chromosomal testis-determining gene. It induces sex determination in males.

Recent studies revealed that SRY plays an important role in inducing Sertoli cells differentiation. The Sertoli cells, in turn, guide testis formation.

Therefore, in males, differentiation of testis is switched on by expression of the Y-linked SRY gene.

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3 years ago

g What basic characteristics do we generally expect to find in all things that qualify as being alive? Question 1 options: 1) an

fgiga [73]

Answer:

Number 2: an ability to: reproduce, respond to stimuli and repair damage.

Explanation:

Some basic characteristics of all living things in general which they all have in common include:

The ability to reproduce (reproduction). All living things reproduce...

Ability to respond to stimuli (irritability)

Ability to repair damage: this is involved with cells in the organisms and to stay alive all organismsin general areade up of cells which has the ability to be repaired if damaged.

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3 years ago

A mosquito goes through complete metamorphosis. In this life cycle which stage comes after the egg stage?

zysi [14]

Answer:

A.Pupa

Explanation:

The four stages are egg, pupa, larva, and adult. The full life-cycle of a mosquito takes about a month.

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3 years ago

Read 2 more answers

Which statements correctly explain why biological productivity in the tropical ocean is so meager when compared to biological pr

Anni [7]

The answer to this question would be:
- The permanent thermocline presents a barrier that keeps nutrients in deeper water from mixing with surface waters.
- The sunlight penetrates deep into the tropical ocean, warming the surface waters and creating stratification of water masses.

In tropical lands, the area is getting sunlight all around the year. This will cause the plant to be able to do photosynthesis all around the year too. Sunlight can penetrate the ocean, but the intensity will be much lower in deeper part. The ocean also become warmer but it will become cold in the deeper part too.

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4 years ago