Blood circulation in a mammal is said to be double because?
- A. it passes twice through the heart in a complete circuit
- B. it moves in both arteries and veins
- C. it circulates in both the heart and other organs
- D. the heart contains auricles and ventricles
If both parents are heterozygous for a trait. the probability that an offspring will be recessive for that trait is?
- A. 1/2
- B. 1/4
- C. 1
- D. 3/4
The mutation theory of organic evolution was propounded by?
- A. Gregor Mendel
- B. Hugo de Vries
- C. Jean Lamarck
- D. Charles Darwin
The movement of part of a plant in response to external stimulus of no particular direction is?
- A. taxism
- B. tropism
- C. haptotropic movement
- D. nastic movement
The most abundant group of organisms in the animal kingdom?
- A. Mammalia
- B. Aves
- C. Insecta
- D. Annelida
The plants that grow in deserts or very dry areas are referred to as?
- A. hydrophytes
- B. epiphytes
- C. xerophytes
- D. mesophytes
Which of the following is true in blood transfusion?
- A. A person of blood group AB can donate blood only to another person of blood group AB
- B. Persons of blood groups A and B can donate or receive blood from each other
- C. A person of blood group AB can receive blood only from persons of blood group A or B
- D. A person of blood group O can donate only to a person of blood group O
The sequence of the one-way gaseous exchange mechanism in a fish is?
- A. mouth --> operculum -> gills
- B. mouth -> gills > operculum
- C. operculum > gills -> mouth
- D. gills -> operculum --> mouth
I. Stomata –> Spirogyra
II. Alveoli –> Earthworm
III. Malpighian tubule -> Mammal
IV. Contractile vacuole -> Protozoa
Which of the above structures is correctly matched with the organisms in which it is found?
- A. II
- B. I
- C. IV
- D. III
Mass of a crucible = 10g,
Mass of a crucible and soil before heating =29g
Mass of a crucible and soil after heating = 18g
From the information above, determine the percentage of water in the given soil sample?
- A. 20%
- B. 25%
- C. 40%
- D. 60%
The order of passage of food in the digestive system is
- A. ileum --> caecum ->large intestine -> rectum
- B. ileum --> colon --> caecum -> rectum
- C. large intestine --> ileum -> caecum -> rectum
- D. colon -> caecum -> ileum -> rectum
The correct sequence of the movement of urea during urine formation is?
- A. glomerulus ---> Bowman's capsule -> convoluted tubule ---> Henle's loop -> collecting- tubule
- B. glomerulus -> Bowman's capsule -> convoluted tubule -> Henle's loop -> convoluted tubule -> collecting tubule
- C. convoluted tubule -> glomerulus --> Nettle's loop -> Bowman's capsule->collecting tubule
- D. convoluted tubule -> Bowman's capsule -> Henle's loop -7> glomerulus -> collecting tubule
Which of the following produces both hormones and enzymes?
- A. Ileum
- B. Pancreas
- C. Gall bladder
- D. Kidney
I. Rattus rattus. Il. Agama agama III. Bufo regularis IV. Tilapia zillii
The order of evolutionary advancement of the above vertebrates is?
- A. I, II, III, IV
- B. I, IV, III, II
- C. II, III, IV, I
- D. IV, III, II, I
The two key cations involved in the action potential of nervous transmissions are?
- A. Na+ and Fe2+
- B. Mg2+ and K+
- C. Na+ and K+
- D. Fe2+ and Mg2+
If a DNA strand has a base sequence TCA, its complementary strand must be?
- A. ATG
- B. TAG
- C. GAT
- D. AGT
When a marine fish was taken from the ocean and put in a tank of fresh water, it died after a short period because?
- A. the tank was too small compared to the large-ocean
- B. the body cells of the fish swelled and burst as a result of the hypotonic fresh water
- C. the body cells of the fish shrank as their sap was hypertonic to the freshwater
- D. there was no food in the tank, so the fish starved
The number of plant species obtained from a population study of a garden is as follows: Guinea grass (15), Ipomoea spp (5), Sida spp (7) and Imperata spp (23)
What is the percentage of occurrence of Imperata spp?
- A. 35%
- B. 16%
- C. 46%
- D. 23%
I. High birth rate and high immigration rate
II. Low birth rate and high immigration rate
III. Low mortality rate and low emigration rate
IV. High mortality rate and high emigration rate.
Which combination of the above can cause rapid over-crowding in climax biotic communities and human settlements?
- A. II and III
- B. I and III
- C. I and IV
- D. I and II
The correct sequence for the perception of smell in mammals is?
- A. chemicals --> olfactory nerve endings --> brain
- B. dissolved chemicals --> nasal sensory cells --> brain
- C. chemicals --> mucus membrane sensory cells --> brain
- D. dissolved chemicals --> sensory cells --> olfactory nerve --> brain
A freshwater plant such as water lily can solve the problem of buoyancy by the possession of?
- A. aerenchyma tissues
- B. dissected leaves
- C. thin cell walls of the epidermis
- D. water-repelling epidermis