Exercise 1

Question 6 :

Movement of cell against concentration gradient is called

A). osmosis
B). active transport
C). diffusion
D). passive transport
Answer : Option B

Explanation :

Active transport, this is the only transport method that can move species against their concentration gradient (from low to high concentration). Facilitated diffusion only moves species down their concentration gradient from high to low concentration.

Question 7 :

Photosynthesis generally takes place in which parts of the plant?

A). Leaf and other chloroplast bearing parts
B). steam and leaf
C). Roots and chloroplast bearing parts
D). Bark and leaf
Answer : Option A

Question 8 :

Most fish do not sink in water because of the presence of

swim bladder
air bladder
air sacs
air in spongy bones

A). I and II are correct
B). II and III are correct
C). III and IV are correct
D). I, II, III and IV are correct
Answer : Option A

Question 9 :

Plants synthesis protein from

A). starch
B). sugar
C). amino acids
D). fatty acids
Answer : Option C

Question 10 :

Plants absorb dissolved nitrates from soil and convert them into

A). free nitrogen
B). urea
C). ammonia
D). proteins
Answer : Option A