The specific role of a species within íts environment is known as its_________
- A. habitat
- B. niche
- C. trophic level
- D. biotic community
The complex relationship between the members of a community and their physical environment is known as________
- A. commensalism
- B. symbiosis
- C. saprophytism
- D. ecology
If 90 ants are found in a field with a total area of 100 m. what is the population density of the ants?
- A. 0.09
- B. 0.90
- C. 9.00
- D. 90.00
The salinity of a brackish habitat________
- A. increases immediately after rainfall
- B. increases at the end of the rain
- C. decreases with an increase in the number of organisms
- D. increases during the dry season
The conversion of ammonium salts into nitrates is called_______
- A. putrefaction
- B. denitrification
- C. fixation
- D. nitrification
Tooth decay is usually caused by___________
- A. undigested and absorbed food
- B. eating a limited amount of sweetened food.
- C. the bacteria ín the mouth that metabolize sugar to acids
- D. eating a lot of proteinous foods
The digestion of proteins starts in the______
- A. small intestine
- B. stomach
- C. large intestine
- D. mouth
The major mineral present in the shell of Molluscs is________
- A. Copper
- B. Sodium
- C. Iron
- D. Calcium
Light is excluded from a water culture experiment in order to________
- A. prevent overheating of the roots
- B. enable the roots to grow straight down
- C. prevent ionization of water molecules
- D. prevent the growth of algae
Which of the following forms of energy is utilized during photosynthesis?
- A. Potential
- B. Kinetic
- C. Solar
- D. Chemical
Deficiency in insulin could lead to________
- A. cirrhosis
- B. hepatitis
- C. diabetes
- D. nephritis
The essential parts of the flower are labelled_______
- A. I, II and III
- B. II, III and IV
- C. III, V and VI
- D. IV, V and VI
The diagram above is an illustration of the longitudinal section of a flower. Study it and answer this question
Which part of the flower is responsible for the protection of young flower buds?
- A. I
- B. II
- C. III
- D. IV
The main function of the amniotic fluid is for______________
- A. respiration in the foetus
- B. protection of the foetus from shock
- C. Lubricating the birth canal foetus
- D. nourishing the foetus
To focus on a distant object, the ciliary muscle of the eye______
- A. contracts and the eye lens gets thicker
- B. relaxes and the eye lens gets thinner
- C. contracts and the eye lens gets thinner
- D. relaxes and the eye lens gets thicker
The function of the part labelled II is that it controls_______
- A. posture and balance of the body
- B. all voluntary actions
- C. temperature and appetite
- D. many involuntary actions
The diagram above is an illustration of a human brain. Study it and answer this question
The part labelled I is the_________
- A. olfactory lobe
- B. cerebellum
- C. cerebrum
- D. medülla oblongata
Which of the following statements is not true about hormones?
- A. Their responses are voluntary
- B. They may affect more than one target organ
- C. They are chemical messengers in animals
- D. They are transported by the blood to the target organs
The process of maintaining a steady internal environment is known as__________
- A. osmoregulation
- B. equilibration
- C. homeostasis
- D. plasmolysis
Excretory products in plants responsible for the discoloration of flowers are called__________
- A. alkaloids
- B. tannins
- C. anthocyanins
- D. resins
The products of tissue respiration are_________
- A. glucose, oxygen, and water
- B. oxygen, water, and energy
- C. glucose, carbon dioxide, and energy
- D. water, carbon dioxide, and energy