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;

TLS Online TPP Program

#Question id: 27042

#Unit 10. Ecological Principles

Specific number of predators will keep the prey population at zero growth, represents

TLS Online TPP Program

#Question id: 27043

#Unit 10. Ecological Principles

Predator has carrying capacity

Following some observation are given

The number of prey, N, increase at low predator densities, P, and decrease at high predator densities

Prey zero isoclines is depends on the ratio of the growth rate of prey to the capture efficiency of the predators

 Number of predator needed for prey isoclines is depends on the ratio of the death rate of predators to the conversion efficiency of predators

Number of predator for prey isoclines depends on the ratio of the death rate of prey to the conversion efficiency of predators

Which of the above observation are true?

TLS Online TPP Program

#Question id: 27044

#Unit 10. Ecological Principles

For two species A and B in competition, the carrying capacities, competition coefficients, per capita growth rate and population size are

KA = 1000           KB = 1200    α of B= 1     β of A= .5       rB= .5         r A= .3                

AN= 500                  BN= 200

According to the Lotka-Voltera model, what is growth rate of species A?

TLS Online TPP Program

#Question id: 29074

#Unit 10. Ecological Principles

Given below is a matrix of possible interactions beneficial. (+), harmful (-), Neutral (0) between species 1 and 2. The names of interactions, A, B, C, D and E respectively;

TLS Online TPP Program

#Question id: 29075

#Unit 10. Ecological Principles

Identify the pollinators for the flowers with following pollination syndromes

I- Flowers evolved features such as blue purple yellow and various other except red

II- Flowers evolved features such as no fragrance because their pollinators has poor sense of smell

III- Flowers only white or light , reflective colors only with strong odori because their pollinators has good sense of smell

IV- flower has every colour including red colour with light floral scent and also providing landing place for nectar

TLS Online TPP Program

#Question id: 29076

#Unit 10. Ecological Principles

Corals and the Dinoflagellates showing which type of mutualism