Neural crest cells that follow a dorso-lateral route of migration under the skin will become melanocytes; how is their differentiation into melanocytes triggered during their migration?

#Question id: 10895

#Unit 10. Ecological Principles

Members of a guild

#Question id: 10896

#Unit 10. Ecological Principles

Resource partitioning results in

#Question id: 10897

#Unit 10. Ecological Principles

When three species of sunfish with similar niches were all placed in the same experimental pond, each made use of resources that they did not exploit in the absence of the other species. This scenario is referred to as

#Question id: 10898

#Unit 10. Ecological Principles

Living in groups, such as the herds of bison that once inhabited the prairie, may evolve because of

#Question id: 10899

#Unit 6. System Physiology – Plant

Companion cells transport of photosynthetic products from producing cells in mature leaves to the sieve elements in the minor veins of the leaf. There are at least three different types of companion cells in the minor veins of mature, exporting leaves, All three cell types have dense cytoplasm and abundant mitochondria;

#Question id: 10900

#Unit 6. System Physiology – Plant

companion cells in minor veins of mature leaves. All three cell types have dense cytoplasm and abundant mitochondria, there are three types companion cells  present in column A while its characteristics given in column B;

             COLUMN A                                                               COLUMN B

A) Ordinary companion cells             i) appear well suited for taking up solutes via cytoplasmic connections numerous plasmodesmata connecting them to bundle sheath cells. Its having numerous small vacuoles, as well as poorly developed thylakoids.

B) Transfer cells                                 ii) have chloroplasts with well-developed thylakoids     and a cell wall with a smooth inner surface. The number of plasmodesmata connecting ordinary companion cells to surrounding cells.

 C) Intermediary cells                          iii) the development of fingerlike wall in growths, particularly on the cell Walls. These wall ingrowths greatly increase the surface area of the transfer cell’s  plasma membrane, few plasmodesmata connect this type of companion cell to any of the surrounding cells except its own sieve element.

Which of the following correct combination;