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daser333 [38]
3 years ago
5

Cactus spines are modified. 1.) Leaves 2.) Stems 3.) Branches

Biology
2 answers:
galina1969 [7]3 years ago
6 0
Cactus spines are modified 1) LEAVES.

Cactus spines occur in clusters in the axil of leaves. Cactus spines are also known as modified bud scales, which also are modified leaves. The spine primordia is produced at the base of the axillary bud's shoot apical meristem; the location where leaf primordia also grows.

Though cactus spines are modified leaves, they do not contain any of the cells or tissues characteristics of leaves when they mature. Cactus spines consist of just a core of fibers surrounded by sclereid-like epidermis cells. When the spines mature, all the cells in the spines are dead. The only living cells are found at the base of the cactus which enables the spine to continue growing.
Agata [3.3K]3 years ago
4 0

Answer: The correct answer is 1) leaves.

Cactus is a desert plant that possesses thick, enlarged, and leafless stems that are covered with sharp spines or spikes. These sharp cactus spines are the modified leaves that provide them an extra advantage for surviving in desert.


Cactus spines provide protection against predator (as they are very sharp) and prevent the loss of water by reducing the flow of air near the cactus and giving them some shade.

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Waves pull away in a srtright line because the the disturbance action of transferring energy is done without an outside influence and in the same medium as well

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A wave is defined as a disturbance which travels through a distance, transferring energy from one place to another

Some few types of waves are

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3 years ago
In cells, the energy available in food is used to make an energy-rich compound called
marshall27 [118]
The answer is letter C. ATP. <span>

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5 0
3 years ago
Which of the following shows a reduction of chromosomes by half?
Daniel [21]

Answer:

"Sporophyte to spores"

Explanation:

"Sporophyte to spores" is the one among the following choices given in the question that shows a reduction of chromosomes by half. The correct option among all the options that are given in the question is the second option. I hope that this is the answer that has actually come to your desired help.

7 0
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Which organelles helps make and transport proteins and lipids?
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8 0
4 years ago
The total DNA content of each daughter cell is reduced during meiosis because
Tanya [424]

Answer:

E) sister chromatids separate during anaphase of meiosis I.

Explanation:

Chromosomes are composed of two chromatids which are joined together through centromere. Chromosomes get doubled its chromatids during its S phase of Interphase. Although chromosomes number remains the same as after S phase but number of chromatids becomes double.

For Example:

In humans 46 chromosomes are present before S phase and 46 chromosomes after S phase. only difference is that chromatids before S phase is 46 in number while after S phase it becomes double i.e becomes 92.

During Prophase 1 of Meiosis 1 these 46 chromosomes with 92 chromatids get arranged in  manner that homologous chromosome pair comes close together and form 23 pairs.

During Metaphase 1: These 23 pairs get arranged in center and attached with spindle fiber present inside cells. Each spindle fiber attach to one member of the pair in a manner that 23 spindle fibers from one side of pole attached to one member of homologous chromosome pairs and 23 spindle fibers from other side of pole attached to other member of homologous chromosome pairs.

In Anaphase 1 of Meiosis 1 these spindle fibers get contracted and pulled attached chromosome along with them towards opposite poles. In this manner chromosome numbers in Meiosis become half as compared to the Mitosis

So Correct Answer of the question is

E. sister chromatids separate during anaphase of meiosis I.

3 0
3 years ago
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