1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
aniked [119]
3 years ago
10

Observing specimens of land plants under the microscope, you see structures not found in algae. What challenge of living on land

does each structure address? A. gravity B. competition C. desiccation D. radiation 1. Spores and pollen are covered by a tough, yellow, substance made of cross-linked lipids. 2. The tip of the shoots and roots have an apical meristem that allows rapid growth. 3. The shoots have many colorful pigments besides those needed for photosynthesis 4. Stems have cellulose and lignin
Biology
1 answer:
mojhsa [17]3 years ago
6 0

Answer:

Explanation:

Gravity: One of the <u>adaptations</u> of land plants are the deposits of <em>lignin and cellulose</em>. The cellular wall is composed of two phases:

-  The fibrillar phase, which is inert, rigid and constituted by long <em>cellulose</em> molecules. <em>Its function is to shape and protect the cell</em>.   

-  The matrix, constituted by pectic and hemicellulose substances.

Other substances can compose the cellular wall. One of them is the <em>lignin</em>, which is one of the most important components of the secondary wall, and after the cellulose, the most abundant polymer. During lignifications, the matrix contracts because of water loss, and the spaces left by the contraction are filled with lignin. Its function is to <em>give rigidity </em>to the cellular wall.

Competition: The meristem is composed of non-differentiated cells, with a thin wall, abundant cytoplasm, small vacuoles, and small endoplasmic reticule. Their size and shape vary: there are small isometric cells, and long, stretched, and fusiform cells. The <em>apical meristems </em>are in the roots and shoots. They compose the primary plant body. During growth the <em>meristem cells start to differentiate</em>, allowing the plant to get <em>bigger and higher</em>. In the competition for light, this is very important, especially when there are too many individuals together, like in a jungle or a forest. They need to <em>get</em> <em>higher</em> to <em>avoid being covered</em> by other plants and <em>to receive more radiation</em> for photosynthesis.  

Desiccation: Spores and pollen are covered by <em>sporodermis</em>, a membrane that covers and protects them. On the surface, there might be a pollinic cement, viscous and lipid, that favors adhesion with a pollinator. One of the principal functions of the sporodermis is to <em>protect the spore or pollen from dehydration</em>.

Radiation: Pigments are helpful filters; by their <em>absorption,</em> they <em>protect different tissues from injurious radiation</em>. When exposed to different  radiation, it is expected a change in plant pigments. This change can be related to different seasons, different stages of the plan development and different tolerance levels. Changes in pigments reflect the structural and functional reorganization of the photosynthetic system and are an indispensable part of the process of plant hardening to the changing radiation conditions.  

You might be interested in
Color Blindness is a sex-linked, recessive trait. Which of the following describes the probability of Color Blindness in the off
Gnom [1K]

The answer is in the image attached.

Hope this helps!

3 0
3 years ago
Karyotypes can be studied to determine an organism’s chromosomal makeup and to detect genetic defects. Down syndrome is a geneti
emmainna [20.7K]
The correct answer for the question that is being presented above is this one: "B. extra chromosome 21." Karyotypes can be studied to determine an organism’s chromosomal makeup and to detect genetic defects. Down syndrome is a genetic disorder that is also called trisomy 21. Trisomy 21 look like in a karyotype with <span>extra chromosome 21</span>
3 0
3 years ago
Read 2 more answers
Which organism's DNA will differ the most from the bird?
ELEN [110]

Answer:

yea it's crocodiles

Explanation:

yea it is crocodiles

7 0
3 years ago
Read 2 more answers
What is the difference between intraspecific and interspecific interactions?
Irina18 [472]

Answer:

Interspecific competition occurs between individuals of different species. Intraspecific competition occurs between individuals of the same species.

Explanation:

mark me brainliest please!!!!

7 0
2 years ago
What is the protein recommendation associated with resistance training for younger adults to increase muscle protein synthesis?
Mademuasel [1]

Whey protein and milk are recommended for muscle protein synthesis in young adults during resistance training.

<h3>What is muscle protein synthesis? </h3>

The metabolic process in which new amino acids are attached to the bound proteins of skeletal muscle is called muscle protein synthesis.

Whey protein is a great choice of consumption for muscle protein synthesis because it contains a high amount of leucine. Milk and dairy products are rich sources of whey protein.

Therefore, the consumption of whey supplements and milk is recommended for increasing muscle protein synthesis in young adults.

Read more about muscle protein synthesis, here

brainly.com/question/7275784

#SPJ4

6 0
1 year ago
Other questions:
  • People trying to gain weight should eat most of their kilocalories from fat. select one:
    8·1 answer
  • How do the kidneys clean the blood?
    12·2 answers
  • The most important factor that limits the size of a cell is _________
    15·1 answer
  • Darlene places a small cube of wood into beaker filled with water. The wood floats on top of the water.which of these best expla
    6·2 answers
  • Which qualities would be best for someone working in Support Services?
    14·1 answer
  • What makes carbon special chemically?
    8·2 answers
  • When a girl bends her arm, she uses a different muscle to bring it back to the original position. why can't she use the same mus
    11·2 answers
  • What is the probability of producing offspring that is white in color? If I said 50% how would it be wrong.
    8·2 answers
  • Science help please!
    12·1 answer
  • the rapid depolarization phase of the action potentials of myocardial contractile cells is due to which ion(s)?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!