DELSU Biology 2012/2013 Past Questions

Practice each question, then open it to see the full details.

Which of the following is not an outcome of ecological succession:

A.there is progressive change in species structure, organic matter and energy flow
B.there are fewer dominant species in the late stages of succession
C.there is no dynamic equilibrium between the community and habitat in the climax stage.
D.None of the above

The statement that the environment determines which organism survives to reproduce.

A.explains the theory of acquired characters
B.support Jean Lamarck's theory ofuse and disuse
C.Supports the idea of survival of the fittest
D.implies that organisms modify their environment in order to survive

The young chick is formed from

A.3
B.3 and 4
C.1, 3 and 5
D.2

Which parts provide food for the developing chick?

A.2 and 3
B.4 and 5
C.3 and 4
D.1 and 2

Which of the following sequence represent the process of blood clothing? 1. Fibrin forms a network of threads 2. Red blood cells are caught and a clot is formed 3. Fibrinogen in plasma changes into soluble fibrin 4. Blood is exposed to air.

A.4,3,2,1
B.4,3,1,2
C.3,1,4,2
D.1,2,3,4

Groundnut is really a 'nut' in the biological sense because

A.it is harvested from inside the ground
B.its pericarp is not hard and tough
C.the fruit is not as hard s the coconut
D.it is an achene

A photometer with a leaf shoot weighed 10.99 initialy and 17.9g after 1 hour. From thus it follows that

A.tempter
B.competition
C.potential hydrogen ion concentration(ph)
D.light

A biotic factor which affects the distribution and abundance of organism in a terrestrial habitatis

A.alleles combine randomly
B.alleles segregate independently
C.alleles separate predictable
D.chromosomes segregate independently

Mendel's second law of inheritance states that

A.15°C
B.19°C
C.24°C
D.33°C

```Use the diagram questions 10 and 12 below to answer ```
The optic at temperature or Dreeding cockroaches is

A.15°C
B.19°C
C.24°C
D.33°C

```Use the diagram questions 10 and 12 below to answer ```
At what temperature will cockroach not survive

A.35%
B.16%
C.46%
D.23%

```Use the diagram questions 10 and 12 below to answer ```
The number of plant species obtained from a population study of a garden is as follows:
Guinea grass (15), pomea spp (5), sida spp(7) and imperata spp
What is the percentage of occurrence of imperata spp

A.the shoot-absorbed 1g of water per hour
B.19 of water per hour evaporated from the photometer
C.the short lost 1g of water per hour
D.shoot was respiring and weight at a rate of 1g per hour