ASSIGNMENT
CLASS : X
(2015-16)
BIOLOGY
Life Processes
1.
Name the following:
a) The process in plants that convert light energy to chemical energy.
b) Organisms that can prepare their own food.
c) The cell organelle where photosynthesis occurs.
d) Cells that surround a stomatal pore.
e) Organisms that live on / inside the body of other organisms.
f) An enzyme secreted from gastric glands in stomach that acts on proteins.
g) Energy currency in living organisms.
h) Tissue which transports water in plants.
i) The term for transportation of food from leaves to other parts of the plant.
j) Largest artery in human body.
k) Mode of nutrition in fungi.
l) The blood vessel which carries blood from organs to heart.
m) The blood cell which helps in clotting of blood.
n) The site of aerobic respiration.
o) Another term for extra cellular fluid.
p) Enzyme which digests fats in small intestine.
q) The end product of anaerobic respiration in fungi.
2.
Write answers to the following in 2-5 sentences.
a) How do guard cells regulate opening and closing of stomatal pores?
b) Differentiate between artery and vein.
c) What causes movement of food in the alimentary canal?
d) Why is the rate of breathing faster in aquatic organisms?
e) Why is blood circulation in human heart called – double circulation?
f) Mention the major steps in photosynthesis. Write the equations.
g) What is the function of gastric glands in the stomach?
h) Define transpiration. Why is their process important for plants?
i) Write the three pathways for breakdown of glucose in living organism.
j) Write the composition of blood giving functions of each cell.
3.
Draw neat labelled diagram.
a) Open & closed stomatal pore.
b) Human alimentary canal.
c) Steps of nutrition in amoeba.
d) Human respiratory system.
e) Internal structure of human heart.
f) Cross section of leaf.
Assignment – 2
1.
Define the following terms:
a) autotrophs
b) heterotrophs
c) saprotrophs
d) parasites
2.
What is dental carries? What is its cause?
3.
What is the role of HCl in the human stomach?
4.
Which enzyme is present in the saliva? What is its function?
5.
What is the function of bile?
6.
What are the raw materials used during photosynthesis? Write chemical equation for
photosynthesis.
7.
Give reasons for the following:
a) Presence of cartilaginous rings in trachea.
b) Why is small intestine in herbivores animals longer than in carnivores?
c) What will happen if mulus is not secreted by the gastric glands?
8.
Explain major events that occur during photosynthesis.
9.
Why is diffusion insufficient to meet the oxygen requirements of multicellular
organisms like humans?
10.
What is the function of digestive enzymes?
11.
How is the small intestine designed to absorb digested food?
12.
What are the different ways in which glucose is oxidized to provide energy in various
organisms?
13.
Write any four differences between aerobic respiration and anaerobic respiration.
14.
Explain the process of nutrition in amoeba.
15.
Draw a well labelled diagram of human digestive system.
16.
How are alvedi designed to maximize the exchange of gases?
17.
What would be the consequences of a deficiency of haemoglobin in our bodies?
18.
Describe the mechanism of breathing in humans.
19.
Differentiate between an artery and a vein.
20.
Why is blood circulation in human heart called double circulation?
21.
What is the advantage of having four chambered heart?
22.
Why do veins have thin walls as compared to artery?
23.
Describe the flow of blood through the heart of human beings.
24.
Write the functions of blood in human.
25.
What is lymph? Explain its functions.
26.
What are the differences between respiration and breathing?
27.
Write the differences between lymph and blood.
28.
What is tranlocation? Why is it essential for plants?
29.
Describe absorption of water and minerals in plants.
30.
Why is it necessary to separate oxygenated and dioxygeneted blood in mammals and
birds?
31.
Why is transpiration important for plants?
32.
What happens to the rate of breathing during vigorous exercise and why?
33.
What is the functions of blood capillaries?
34.
Give reasons:
a) The glottis is guarded by epiglottis.
b) The lung alveoli are covered with blood capillaries.
c) Veins have valves while vales are absent in arteries.