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

The mutation theory of organic evolution was propounded by?

• A. Gregor Mendel
• B. Hugo de Vries
• C. Jean Lamarck
• D. Charles Darwin

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 plants that grow in deserts or very dry areas are referred to as?

• A. hydrophytes
• B. epiphytes
• C. xerophytes
• D. mesophytes

When a Spirogyra cell is immersed in a salt solution more concentrated than its cell sap, it?

• A. remains unchanged
• B. takes tip water and burst
• C. absorbs a little water
• D. loses water and shrivels

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%

Which of the statements below is not characteristic of wind-pollinated flowers?

• A. Stigmas are usually large and feathery
• B. Nectary is usually absent
• C. The pollen grains have rough spiny surfaces
• D. The flowers are not scented.

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

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

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