What will happen to a plant if its xylem is removed?
Xylem in plant transports water and dissolved mineral nutrients from the roots to all parts of the vascular plant. So, if xylem is removed from the plant, the water and mineral supply to the plant will stop and therefore, the plant will die.
Name the correct substrates for the following enzymes
(a) Trypsin (b) Amylase (c) Pepsin (d) Lipase
What is the name of the extensions of the epidermal cells of a root which help in respiration ?
Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.
Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms ?
(a) Explain how, the air we breathe in gets cleaned while passing through the nasal passage.
(b) Why do the walls of trachea not collapse when there is less air in it ?
(c) How are oxygen and carbon dioxide exchanged in our body during respiration ?
(d) How are lungs designed in human beings to maximise the exchange of gases ?
In mammals and birds why is it necessary to separate oxygenated and de-oxygenated blood ?
Name the green dot like structures in some cells observed by a student when a leaf peel was viewed under a microscope. What is this green colour due to?
Name the intermediate and the end products of glucose breakdown in aerobic respiration.
Name the component of blood that helps in the formation of blood clot in the event of a cut.
(a) What is meant by breathing? What happens to the rate of breathing during vigorous exercise and why?
(b) Define translocation with respect to transport in plants. Why is it essential for plants? Where in plants are the following synthesised?
(i) Sugar (iii) Hormone
The leaves of a plant first prepare food A by photosynthesis. Food A then gets converted into food What are A and B ?
All the animals can be divided into three groups on the basis of their eating habits. Name the three groups.
Which of the organs perform the following functions in humans ?
(i) Absorption of food
(ii) Absorption of water
Fill in the following blanks with suitable words :
(a) All green plants are…………..
(b) All non-green plants and animals are…………
(c) Heterotrophs depend on…….. and other……………… for food,
(d) Green plants use……… ,………… and………… to make food.
(e) Iodine turns blue-black on reacting with………………
(a) Name the raw materials required for photosynthesis. How do plants obtain these raw materials ?
(b) What are the various conditions necessary for photosynthesis ?
(c) Name the various factors which affect the rate of photosynthesis in plants.
(a) Name the main organs of the human digestive system. Also name the associated glands.
(b) How do carbohydrates, fats and proteins get digested in human beings ?
Name the substance whose build up in the muscles during vigorous physical exercise may cause cramps.
What are the differences between aerobic and anaerobic respiration ? Name some organisms that use anaerobic mode of respiration.
Name the final product/products obtained in the anaerobic respiration, if it takes place :
(a) in a plant (like yeast).
(b) in an animal tissue (like muscles).
What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.
(a) Draw a diagram of excretory system in human beings and label the following parts. Aorta, kidney, urinary bladder and urethra.
(b) How is urine produced and eliminated ?
