Why do organisms need to take food?

Distinguish between a parasite and a saprotroph.

How would you test the presence of starch in leaves?

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

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

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 __________________.

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.

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) Cuscutta

(ii) china rose

(iv) pitcher plant

(iv) rose

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

Column I                                 Column II        

Chlorophyll                             Bacteria

Nitrogen                                 Heterotrophs

Amarbel                                 Pitcher plant

Animals                                  Leaf

Insects                                   Parasite

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)

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.

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.

Why do farmers grow many fruits and vegetable crops inside large green houses? What are the advantages to the farmers?