How do autotrophs obtain CO₂ and N₂ to make their food?

Name the tissue which transports (a) Soluble products of photosynthesis in plants (b) Water and minerals in plants.

Name the largest: (a) Artery (b) Vein in our body.

What is the function of (a) Platelets (b) Haemoglobin in our body?

What will happen to a plant if its xylem is removed?

Define transpiration. Give its role in the plants.

What disadvantage (if any) would be there, if the human RBCs become biconvex instead of their normal biconcave shape?

What is the function of pancreas in the human digestive system?

Where does digestion of fat take place in our body?

What is the function of digestive enzymes?

What is meant by breathing? What happens to the rate of breathing during vigorous exercise and why?

Name four chambers of human heart. State one function of each chamber in a tabular form.

Give one structural and one functional difference between an artery and a vein.

What is meant by blood pressure? How systolic pressure differs from diastolic pressure?

Differentiate between aerobic and anaerobic respiration.

Name the end products formed during:

(i) Oxidation of glucose in the muscles

(ii) Oxidation of glucose in body cells

(iii) Breakdown of glucose anaerobically.

Give only the function of the following

(a) Stomatal pore (b) Guard cell.

What is the role of: (a) Bile (b) Lipase (c) Salivary amylase (d) Trypsin?

What wold be the consequences of a deficiency of haemoglobin in our bodies?

What are the necessary condition for autotrophic nutrition? What are its by-products?

Describe double circulation in human beings. Why is it necessary?

What are the differences between the transport of materials in xylem and phloem?

Compare the functioning of alveoli in lungs and nephrons in the kidneys with respect to their structure and functioning.

Draw a labelled diagram of sectional view of human heart of human digestive system.

What is the role of folowing: (i) Lymph (ii) RBCs?

Define translocation with respect to transport in plants. Why is it essential for plants? Where in plants are the following synthesised:

(a) Sugar (b) Hormone?

The opening and closing of the stomatal pore depends upon:

Choose the forms in which most plants absorb nitrogen:

(i) Proteins

(ii) Nitrates and nitrites

(iii) Urea

(iv) Atmospheric nitrogen

Which is the first enzyme to mix with food in the digestive tract?

If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?

The inner lining of stomach is protected by one of the followings from hydrochloric acid. Choose the correct one:

Which part of alimentary canal receives bile from the liver?

A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains:

In which part of the alimentary anal food is finally digested?

Choose the function of the pancreatic juice from the following:

When air is blown from mouth into a test tube containing lime water, the lime water turned milky due to the presence of:

Which of the following statements is (are) true about heart?

(i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs.

(ii) Left ventricle pumps oxygenated blood to different bod parts while right ventricle pumps deoxygenated blood to lungs.

(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts.

(iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body.

What prevents backflow of blood inside the heart during contraction?

Single circulation, i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by:

In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body?

Which is the correct sequence of air passage during inhalation?

During respiration, exchange of gases takes place in:

Which of the following statements is (are) correct?

(i) Pyruvate can be converted into ethanol and carbon dioxide by yeast.

(ii) Fermentation takes place in aerobic bacteria

(iii) Fermentation takes place in aerobic bacteria

(iv) Fermentation is a form of anaerobic respiration

Lack of oxygen in muscles often leads to cramps among cricketers. This result due to:

Choose the correct path of urine in our body:

Which of the following is an incorrect statement?

Write true or false for the following statements:

The chemical process involved in the removal of harmful metabolic wastes from the body is called excretion.

Write true or false for the following statements:

Just as CO₂ is removed from the blood in the lungs, nitrogenous wastes such as urea or uric acid are removed from blood in the liver.

Write true or false for the following statements:

Urine is stored in the urinary bladder until the pressure of the expanded bladder leads to the urge to pass it out through the urethra.

Write true or false for the following statements:

Kidneys are located in the thoracic cavity, one on either side of the backbone.

Write true or false for the following statements:

The walls of auricles are comparatively thicker than ventricles.

Write true or false for the following statements:

The largest artery is aorta and vein is vena cava.

Write true or false for the following statements:

Reptiles have three chambered heart, mammals have two chambered and fishes have only two chambered heart.

Write true or false for the following statements:

In xylem, minerals in solution from move in both directions (upward and downward).

Write true or false for the following statements:

Bile is an alkaline fluid produced by liver and stored in the gall bladder.

Write true or false for the following statements:

Liver is the largest organ as well as the largest gland of the body.