Xylem tissue consists of the following cells EXCEPT

A. sieve tubes

B. tracheids

C. vessels

D. fibres

E. parenchyma

The correct sequence of energy transfer among living organisms in an ecosystem is

A. consumers - decomposers – producers

B. consumers - producers - decomposers

C. decomposers - producers- consumers

D. producers - consumers- decomposers

E. producers - decomposers- consumers

Which of these is NOT a method of improving crop yield?

A. spraying the crops with chemicals

B. mechanized farming

C. sowing pest resistant varieties of seeds

D. storing the crops in barns or silos

E. sowing of viable seeds

Simple sugars are also called

A. cellulose

B. disaccharides

C. monosaccharides

D. polysacchaiides

E. starch

Plants that are found in extreme dry conditions are called

A. epiphytes

B. hydrophytes

C. mesophytes

D. thallophytes

E. xerophytes

Which of the following is NOT a characteristic of digestive enzymes?

A. changes in pH affect enzymes

B. enzymes react best at high temperature

C. enzymes react reversibly

D. they are affected by intake of poisons

E. they are protein in nature

Which of the following is released from car exhaust due to incomplete combustion of fuel?

A. carbon dioxide

B. carbon monoxide

C. nitrogen dioxide

D. oxygen

E. sulphur dioxide

The part of the kidney tubule where ultra filtration takes place is the

A. Bowman’s capsule

B. distal convoluted tubule

C. Henle’s loop

D. main collecting tubule

E. proximal convoluted tubule

The plant cell is different from an animal cell because it has

A. cellulose cell-wall

B. cytoplasmic content

C. centriole

D. mitochondria

E. nucleus

The following are classes of dry in-dehiscent fruits EXCEPT

A. achene

B. caryopsis

C. cypsela

D. follicle

E. schizocarp