Identify the mode of nutrition where sunlight is used along with CO₂ and water to prepare food.

State the photosynthetic reaction and where does it occur?

Which organelle acts as the site of photosynthesis?

Name the raw materials which are essential to carry out the process of photosynthesis in plants.

What type of nutrition occurs in fungi?

How do parasitic organisms derive their nutrition?

Explain the term ingestion.

What are pseudopodia?

State the location of salivary glands.

Why carnivores have shorter small intestine?

How do villi increase the surface area?

Where is bile juice produced?

Explain the significance of peristalsis.

Which raw materials are responsible for the release of O₂, in photosynthesis?

What happens to extra glucose or carbohydrate in an animal body?

Name an energy rich carbohydrate stored in large quantities in liver and muscle cells.

What is mainly digested by stomach of man?

How does most CO₂, reach the photosynthesising cells of a green leaf?

Name two molecules produced by the digestion of starch and fat respectively.

What will happen if the liver of a person gets damaged?

Draw a graph which shows the effects of temperature on the rate of photosynthesis.

Stomata of desert plants remain closed during the day. Explain how and when they take up CO₂ to perform photosynthesis?

(i) Write the reaction that represents the chemical changes which take place during photosynthesis.

(ii) State the function of chlorophyll.

Which feature(s) help the plants to make food by the process of photosynthesis?

Give the steps involved in photosynthesis.

Write the difference between nutrition in plants and animals.

Draw a labelled diagram of stomata. List two functions of stomata.

What are the raw materials required for photosynthesis to occur? Write the chemical equation of the process.

Explain the digestion of chapati in human beings. Draw a diagram depicting human alimentary canal.

The general requirement for energy and materials is common to all living organisms. Living beings need plants and trees in order to survive, as most of their needs are met by them.

Read the passage and answer the questions.

(i) Do plants also depend on some source for food production? Explain.

(ii) How do we derive nutrition for survival? How does this nutrition vary among different organisms?

(iii) What do we learn concerning the increased cutting of trees and removal of the green cover?

Reading about the digestive glands and their action, a student got confused about some facts. Given below are some questions, concerning the facts.

(i) Why cannot we digest raw green plants in our alimentary canal?

(ii) Why are digestive enzymes present in an inactive form in the body when we can require their action any time?

(iii) HCL is an acid which kills bacteria ingested with food, but does not harm the walls of stomach. Why?

(iv) What values do you think the student conveys from his questions?

In photosynthesis, which substances are used up, which are produced and which are necessary, but remain unchanged after the reaction?

The diagram shows the arrangement of cells inside the leaf of a green plant. (No cell contents are shown).

Which cells normally contain chloroplasts?

Choose the forms in which most plants absorb nitrogen:

I. Proteins

II. Nitrates and nitrites

III. Urea

IV. Atmospheric nitrogen

Choose the correct option.

A plant is kept in the dark for two days. A leaf is used in an experiment to investigate the effect of two factors on photosynthesis as shown in the diagram.

What are the colours of Q and R, when the leaf is tested for starch, using iodine solution?

The diagram represents a section through the small intestine.

What is the role of the structure labelled X?

When a person eats some egg white, proteins and water enter the stomach. Which substances are found leaving the stomach and leaving the small intestine?

In which order do these events occur in human nutrition?

The diagram shows the human gut. Which numbered structures secrete digestive enzymes?

Only two of the following statements accurately describe what happens in the mouth.

1. Amylase breaks down large starch molecules into smaller maltose molecules.

2. Chewing increases the surface area of food for digestion

3. Saliva emulsifies fats into smaller droplets.

4. Teeth breakup large insoluble molecules into smaller soluble molecules.

Which statements are correct?