Question:
Name the two stages in photosynthesis.
Answer:
The two stages in photosynthesis are
(i) Light reaction and
(ii) Dark reaction.
Life Processes
Q 1.
What are the different ways in which glucose is oxidised to provide energy in various organisms ? Give one example of each.
Q 2.
What are the functions of the liver and the pancreas?
Q 3.
What will happen if mucus is not secreted by the gastric glands?
Q 4.
What is saliva? State its role in the digestion of food.
Q 5.
How are the alveoli designed to maximise the exchange of gases?
Q 6.
Define (i) saprophytic nutrition (ii) parasitic nutrition, and (iii) holozoic nutrition. Give one example of each type.
Q 7.
Why and how does water enter continuously into the root xylem?
Q 8.
Draw a diagram of human respiratory system and label on it :
(i) Diaphragm (ii) Larynx
Q 9.
(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 ?
Q 10.
Name the intermediate and the end products of glucose breakdown in aerobic respiration.
Q 11.
All the animals can be divided into three groups on the basis of their eating habits. Name the three groups.
Q 12.
What substance is mixed with food in the mouth during chewing by the teeth ?
Q 13.
Name one organism which can live without oxygen.
Q 14.
Name an animal which absorbs oxygen through its moist skin.
Q 15.
The trachea divides into two tubes at its lower end. What is the name of these tubes ?
Q 16.
Where does the blood absorb oxygen in the human body ?
Q 17.
What type of respiration takes place in human muscles during vigorous physical exercise ? Give reason for your answer.
Q 18.
Describe the process of respiration in State whether it is anaerobic respiration or aerobic respiration.
Q 19.
(a) What is meant by aquatic animals and terrestrial animals ?
(b) From where do the aquatic animals and terrestrial animals obtain oxygen for breathing and respiration ?
Q 20.
Define nutrition? What are the different modes of nutrition?
Q 22.
Give two points of differences between respiration in plants and respiration in animals.
Q 23.
What are the living organisms that cannot make their own food called?
Q 24.
What is compensation point?
Q 25.
Other than chlorophyll, which other pigment is necessary for photosynthesis?
Q 26.
What are the necessary conditions for autotrophic nutrition and what are its byproducts?
Q 27.
What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.
Q 28.
Describe double circulation in human beings. Why is it necessary?
Q 29.
Is nutrition' a necessity for an organism? Discuss.
Q 30.
What is the significance of emulsification of fats?
Q 31.
What is the advantage of having four chambered heart?
Q 32.
Explain the role of mouth in digestion of food.
Q 33.
Name the correct substrates for the following enzymes
(a) Trypsin (b) Amylase (c) Pepsin (d) Lipase
Q 34.
Explain the process of nutrition in Amoeba.
Q 35.
Name the acid presents in the following:
(i) Tomato (ii) Vinegar (iii) Tamarind
Q 36.
State the role of the following in human digestive system :
(i) Digestive enzymes (ii) Hydrochloric acid (iii) Villi
Q 37.
What is translocation'in plants?
Q 38.
(a) Name a gas used in photosynthesis.
(b) Name a gas produced in photosynthesis.
Q 39.
Name the pigment which can absorb solar energy.
Q 40.
Name the green pigment present in the leaves of a plant.
Q 41.
(a) What are heterotrophs ? Give one example of heterotrophs.
(b) What is the difference between autotrophic nutrition and heterotrophic nutrition ?
Q 42.
What substances are contained in pancreatic juice ? What are their functions ?
Q 43.
(a) What would happen if all the green plants disappear from the earth ?
(b) If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring ? Justify your answer.
Q 44.
Do all cells use oxygen to produce energy ?
Q 45.
Name the red pigment which carries oxygen in blood.
Q 46.
Which gases are exchanged in your lungs ?
Q 47.
Name the factors, which affect photosynthesis.
Q 48.
In which kind of respiration is more energy released?
Q 49.
Name the respiratory organs of
(i) fish
(ii) mosquito
(iii) earthworm
(iv) dog
Q 50.
From where do the following take in oxygen?
(i) prawn (ii) rat.
Solution:
