Lecture 3: Revision

Choose the correct option from the following:

Plants take carbon dioxide from the atmosphere mainly through their:

(i) roots

(ii) stem

(iii) flowers

(iv) leaves

Choose the correct option from the following:

Which part of the plant takes in carbon dioxide from the air for photosynthesis?

(i) Root hair

(ii) Stomata

(iii) Leaf veins

(iv) Sepals

Mark 'T' if the statement is true and 'F' if it is false:

(i) Carbon dioxide is released during photosynthesis. (T/F)

(ii) Plants which synthesise their food themselves are called saprotrophs. (T/F)

(iii) The product of photosynthesis is not a protein. (T/F)

(iv) Solar energy is converted into chemical energy during photosynthesis. (T/F)

Match the items given in Column I with those in Column II:

Tick the correct answer:

(a)Amarbel is an example of

(i) autotroph

(ii) parasite

(iii) saprotroph

(iv) host

(b)The plant which traps and feeds on insects is

(i) Cuscuta

(ii) china rose

(iii) pitcher plant

(iv) rose

Name the following:

(i) A parasitic plant with yellow, slender and tubular stem.

(ii) A plant that has both autotrophic and heterotrophic mode of nutrition.

(iii) The pores through which leaves exchange gases.

Fill in the blanks:

(a) Green plants are called __________ since they synthesise their own food.

(b) The food synthesised by the plants is stored as __________.

(c) In photosynthesis solar energy is captured by the pigment called ___________.

(d) During photosynthesis plants take in ___________and release ___________.

Show with the help of a sketch that the plants are the ultimate source of food.

Give a brief description of the process of synthesis of food in green plants.

How would you test the presence of starch in leaves?

Distinguish between a parasite and a saprotroph.

Why do organisms need to take food?