Brain Out

Marchantia sp. is classified under which phylum?

• Hepatophyta

• Lycopodiophyta

• Chlorophyta

• Bryophyta

Most conifers have separate male and female reproductive parts on the same tree. This condition is referred to as

• dioecious

• heterosporous

• monoecious

• homosporous

Sponges are separated by other animal phyla because

• lack true tissue

• sessile

• radial symmetry

• feeding mode by filter feeders

What are the male sex organs of bryophytes that produce sperm cell?

• Archegonia

• Sporophyte

• Antheridia

• Anthers

The figures above show two types of natural selection, M and N, in a population.

Which of the following statements are correct?

I In M, only one extreme phenotype is favoured

II The extreme phenotypes in N are eliminated

III N tends to act to prevent changes in forms and functions

• I only

• I and III only

• I and II only

• I, II and III

Which of the following is a postzygotic isolationg mechanism?

• Gametic isolation

• Behavioral isolation

• Temporal isolation

• Hybrid breakdown

High frequencies of rare genetically inherited traits in people who share a common ancestor is most likely the result of

• Huntington's disease

• founder effect

• bottleneck effect

• natural selection

The total number of individuals of the same species that occupy a given area at a given time is the

• population growth

• population size

• carrying capacity

• intraspecific competition

_____ is the average number of individuals of the same species per unit of surface area at a given time.

• Population growth

• Population size

• Population density

• Carrying capacity

A population's carrying capacity is

• the population size that can be supported by the available resources found within the habitat

• reached when the number of deaths exceeds the number of births

• when a population size decrease after a certain period of time

• the average number of individuals of the same species per unit of surface area at a given time