True of false
I'm choosing false.
Answer | Explanation: The difference in species diversity between an ecosystem undergoing primary succession and one undergoing secondary succession can be described as follows:
1. Primary Succession: In primary succession, an ecosystem develops in an area that was previously devoid of life, such as a newly formed volcanic island or a bare rock surface. As the ecosystem starts from scratch, the process is slow, and the initial species colonizing the area are usually hardy pioneer species, such as lichens and mosses. These species have adaptations that allow them to survive in harsh and barren conditions. Over time, as the ecosystem progresses through different stages, more complex and diverse species gradually colonize the area. Therefore, species diversity is initially low in ecosystems undergoing primary succession.
2. Secondary Succession: Secondary succession occurs in an ecosystem that has been disturbed or disrupted, but where the soil and some remnants of the previous community remain. Examples of disturbances that lead to secondary succession include forest fires, clear-cutting, or abandoned agricultural land. In secondary succession, the recovery process is faster compared to primary succession because there is already a foundation of soil and existing species. As the ecosystem regenerates, a variety of species, including both early-successional and late-successional species, can quickly recolonize the area. This leads to a higher initial species diversity in ecosystems undergoing secondary succession compared to primary succession.
In summary, the main difference in species diversity between an ecosystem in primary succession and one in secondary succession is that primary succession starts with low species diversity and gradually increases over time, while secondary succession begins with higher species diversity due to the presence of soil and remnants of the previous community.
Variable is the single factor tested in an experiment.
Variable is any factor or condition that can be tested, changed, or measured in an experiment. Scientific experiments have various kinds of variables. They include independent variables, dependent variables, constant variables and extraneous variables. The independent variable is the only factor that can be changed in a science experiment.
In flowering plants the process of mitosis is restricted to the apical
and to
In growing mammals
mitosis can occur throughout the body.
However, not all regions of the young mammal grow at the same
rate and this is called
growth.
In the cell cycle, replication of DNA occurs in the..
.............phase,
after which there is a lag or gap phase, called the
phase,
before actual mitosis starts. The chromosomes also replicate before the
onset of mitosis, but this replication is not visible until the middle of the
. stage.
At this stage, each chromosome consists of two
..held
together by a
Answer:
This question is incomplete
Explanation:
This question is incomplete but there are some general facts that can be made.
Firstly, mitosis only occurs in meristematic tissue of plants which includes apical and lateral meristems
There are 4 phases in a cell cycle
1) G1 (gap 1) phase: This is the first phase of the cell cycle that has to do with an increase in the size of the cell. Major cellular components duplicate in size here.
2) S-phase: DNA replication occurs here.
3) G2 (gap 2) phase: This is the gap phase that comes after the S-phase. The cell undergoes further growth here and the organelles of the cells are also prepared for cell division.
4) Mitotic phase: There are four stages here
i) prophase: Chromosome condenses and becomes visible at this stage. And there is the emergence of spindle fibre from centrosomes.
ii) metaphase: Spindle fibre develops and sister chromatids are attached to
separate spindle.
iii) anaphase: Cohesin, which holds two sister chromatids (of chromosomes) together, breaks down and are pulled towards opposite poles.
iv) telophase: Chromosomes begins to decondense at opposite poles and actual cell division starts as mitotic spindle breaks down.
NOTE: All possible answers to the question are underlined