Nutrition in Plants quiz

The food factories of plants are the:

The green pigment in leaves is:

The gas released during photosynthesis is:

Cuscuta is an example of a:

Starch gives which colour with iodine?

Lichens are an association of:

Tiny pores on the surface of leaves are:

Mushrooms obtain food from:

The pitcher plant traps insects to obtain:

Rhizobium lives in the root nodules of:

Why are plants called producers? (2 marks)

How does water reach the leaves from the soil? (2 marks)

Why are fungi not able to make their own food? (2 marks)

What are the products of photosynthesis? (2 marks)

Why does the pitcher plant need to trap insects though it is green? (2 marks)

What are heterotrophs? Give two examples. (2 marks)

How do the alga and fungus help each other in a lichen? (2 marks)

Name two nutrients that plants get from the soil. (2 marks)

Why is Cuscuta harmful to its host? (2 marks)

Can photosynthesis occur in parts of the plant other than leaves? Give an example. (2 marks)

A student tested 12 leaves for starch: 9 from a plant in sunlight turned blue-black, and 3 from a plant in darkness did not. What percentage of the tested leaves contained starch? What conclusion follows? (3 marks)

A field of wheat needs about 120 kg of nitrogen per hectare. If a farmer grows pulses first, which add about 40 kg per hectare, how much nitrogen must he add as fertiliser for 3 hectares of wheat afterwards? (3 marks)

A leaf has about 300 stomata per square mm on its lower surface. How many stomata are there in a 2 square cm area? (1 square cm = 100 square mm.) (3 marks)

In an experiment, a water plant gave out 6 bubbles of oxygen per minute in dim light and 24 bubbles per minute in bright light. How many times more oxygen was produced in bright light? What does this show? (3 marks)

Classify into autotrophs and heterotrophs and count each group: rose, cow, mushroom, neem, Cuscuta, grass, human, algae. (3 marks)

Read the passage and answer the questions. Boojho saw a yellow, wire-like plant without leaves twining around a hedge. The hedge plant looked weak. (i) Name the yellow plant. (ii) What is its mode of nutrition? (iii) Why did the hedge look weak? (5 marks)

Read the passage and answer the questions. A farmer grew gram after harvesting wheat and found that the next wheat crop grew well with less fertiliser. (i) Which bacteria helped? (ii) Where do they live? (iii) What did they add to the soil? (5 marks)

Read the passage and answer the questions. In the rainy season, Paheli found white cottony patches on leather shoes and pickles left in a damp cupboard. (i) What are the patches? (ii) What is their mode of nutrition? (iii) Why do they appear in the rainy season? (5 marks)

Read the passage and answer the questions. A pitcher plant has leaves shaped like a jug with a lid. Insects that enter get trapped and are digested. (i) Which part is the modified leaf? (ii) Why does it trap insects? (iii) Is it an autotroph? Explain. (5 marks)

Read the passage and answer the questions. Some plants, like cacti, have spines instead of leaves and live in deserts. (i) Which part of a cactus carries out photosynthesis? (ii) Why are leaves reduced to spines? (iii) How does the cactus get carbon dioxide? (5 marks)

Explain the process of photosynthesis with a labelled diagram of a leaf. Write the word equation and the conditions needed. (6 marks)

Describe an experiment to show that sunlight is needed for photosynthesis using the iodine test. Draw the steps. (6 marks)

Explain four other modes of nutrition in plants: parasitic, insectivorous, saprotrophic and symbiotic, with one example and a sketch of any two. (6 marks)

Explain how nutrients are replenished in the soil by manure, fertilisers and Rhizobium. Draw a labelled root of a pea plant showing nodules. (6 marks)

Draw a flowchart showing how energy from the Sun reaches animals through plants and explain why plants are called the ultimate source of food. (6 marks)