Biology Past Questions And Answers
1571
The medulla oblongata controls all the following except
- A. heart beat
- B. breathing rate
- C. blood pressure
- D. balance and posture
1572
Which of the following organs are used for gaseous exchange in a mature toad?
- A. Gills, lungs and eardrum
- B. Lungs, mouth and eardrum
- C. Mouth, skin and gills
- D. Skin, lungs and mouth
1573
Which of the following is an example of variation?
- A. Blood
- B. Tongue rolling
- C. Reproduction
- D. Growth
1574
Which of the following statements about ecosystems is false?
- A. All the energy entering the ecosystem is passed on to decomposers
- B. The primary producers provide energy for herbivores and carnivores
- C. Ecosystems must start with the capture of energy by autotrophs
- D. Energy transfer from one trophic level to the other is not 100% efficient.
1575
In which of the following does external fertilization take place?
- A. toad
- B. lizard
- C. bird
- D. cockroach
1576
In which of the following organism does a single cells performs all the function of movement, nutrition, growth , excretion, photosynthesis?
- A. Paramecium
- B. Euglena
- C. Amoeba
- D. Spirogyra
1577
When a mammal respires anaerobically for a long time
- A. pyruvic acid is convened into acetyl COA
- B. more energy is released from fats in the body
- C. lactic acid accumulates in the muscles
- D. the Krebs cycle is fully completed.
1578
The number of times an organism occurs within a given area of a habitat is referred to as
- A. Population growth rate
- B. Population frequency
- C. Population growth rate
- D. Population density
1579
An insect with a mandibulate mouth part will obtain its food by
- A. biting and chewing
- B. chewing and sucking
- C. chewing
- D. sucking
1580
The food substance that would produce the highest amount of energy is
- A. protein
- B. amino acid
- C. fat
- D. glucose