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LiRa [457]
3 years ago
6

Why do most angiosperms have alternate phyllotaxy, with leaf emergence at an angle of 137.5° compared to leaves above and below?

Biology
1 answer:
Elanso [62]3 years ago
4 0

Answer: The answer is D: to allow maximum exposure to light and to reduce shading of lower leaves.

Explanation:

The arrangement of leaves on a Stem is known as Phyllotaxy. It is used to enable them obtain maximum exposure to sunlight.

Leaves are classified as either alternate, spiral or opposite.

Leaves with alternate pattern arise at a different point (node) on the stem. This helps reduce shading of the lower leaves.

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What does the identity of an element depend on the number of?
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Answer:

C

Explanation:

The Periodic Table organizes the elements according to their properties. One atom of each element is made up of protons, neutrons, and electrons. The number of electrons determines how an element reacts. The number of protons gives the element its identity.

5 0
1 year ago
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Which of the following correctly describes the process of sexual reproduction in flowering plants?
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3 years ago
Según la clasificación de ecosistemas, indica si los siguientes ejemplos de ecosistemas son correctos: Una piscina es un ecosist
Hatshy [7]

Answer and Explanation:

  • <em>Una piscina es un ecosistema acuático y seminatural: FALSO. </em>La piscina corresponde a un ecosistema acuático, siempre y cuando existan seres vivos habitando en ese medio e interactuando entre ellos y con los factores físicos como temperatura del agua, pH, etc. No corresponde a un medio seminatural porque su origen es totalmente artificial, es decir, hecho por el hombre.
  • <em>La pradera es un ecosistema terrestre y natural : VERDADERO. </em>Es terrestre por encontrarse en un espacio continental no inundable, y natural por no ser intervenido por el hombre.
  • <em>Un bosque nativo es un ecosistema terrestre y natural: VERDADERO. </em>Un bosque no es inundable, por lo que se considera netamente terrestre y mientras no sea intervenido por la acción humana es un ecosistema natural.<em> </em>
  • <em>Un arroyo es un ecosistema dulceacuícola y natural: VERDADERO. </em>Entre las posibles ubicaciones de un ecosistema acuático, se hayan aquellos que se encuentran en un medio de agua dulce, tales como arroyos, lagos, ríos, entre otros. Al no ser alterado por el hombre, se lo considera también un ecosistema de origen natural.    <em> </em>
  • <em>El mar es un ecosistema marino y artificial: FALSO. </em>El mar sí es un ecosistema acuático marino. Sin embargo no es un ecosistema alterado o creado por el hombre en forma artificial, sino que tiene un origen plenamente natural.
  • <em>Las ciudades son ecosistemas terrestres y seminatural: FALSO. </em>Pueden ser consideradas terrestres por estar ubicadas en el continente, pero son de origen artificial por ser creadas por el hombre.
  • <em>Las represas son ecositemas seminatural y acuático: VERDADERO. </em>Las represas son creadas en un medio natural que ha sido parcialmente modificado por el hombre, lo que las convierte en seminaturales. Corresponden a ecosistemas acuáticos de agua dulce.  
3 0
3 years ago
Cytoplasmic division or ____________ begins during anaphase of mitosis and continues as the cell pinches into two new cells.
vova2212 [387]

Cytoplasmic division or cell division begins during anaphase of mitosis and continues as the cell pinches into two new cells.

During  the proces of cytokinesis, the cell membrane pinches in at the cell equator, which forming the cleft called the cleavage furrow. The position which depends on the position of the astral and interpolar microtubules during the anaphase.During the process of anaphase, each pair of chromosomes is separated into two identical, and independent chromosomes.

The chromosomes which are separated by a structure that is known as the mitotic spindle.The cohesion proteins located between the sister chromatids disappear and  the sister chromatids which located at the equator of the metaphase plate Anaphase where is starts,and  separate and begin their migration toward the opposite poles of the mitotic spindle.

To learn more about cell division here

brainly.com/question/13312481

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5 0
2 years ago
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