Life Processes


Describe the process of respiration in fish.


Respiration and fish: The fish has special organ of breathing called gills on both the sides of its head. The gills are covered by gill covers. The fish lives in water which contains dissolved oxygen. The fish breathes by taking in water through its mouth and sending it over the gills. When water passes over the gills, the gills extract dissolved oxygen from the water. The extracted oxygen is absorbed by the blood and carried to all the parts of the fish. The carbon dioxide produced by respiration is brought back by the blood into the gills for expelling into the surrounding water.


Life Processes

Q 1.

Define (2) saprophyte, and (22) parasite. Name two saprophytes and two parasites.

Q 2.

Explain why, it is dangerous to inhale air containing carbon monoxide.

Q 3.

Where is chlorophyll mainly present in a plant ?

Q 4.

State whether the following statements are true or false :
(a) During respiration, the plants take C02 and release 02.
(b) Energy can be produced in cells without oxygen.
(c) Fish and earthworm exchange gases during respiration in the same way.

Q 5.

Is nutrition' a necessity for an organism? Discuss.

Q 6.

Apart from sunlight and chlorophyll, what other things are required to make food by photosynthesis ?

Q 7.

How does Amoeba engulf the food particle ?

Q 8.

(a) Which part of the body secretes bile ? Where is bile stored ? What is the function of bile ?
(b) What is trypsin ? What is its function ?

Q 9.

Name the following :
(a) The process in plants which converts light energy into chemical energy.
(b) Organisms that cannot prepare their own food.
(c) Organisms that can prepare their own food.
(d) The cell organelle where photosynthesis occurs.
(e) The cells which surround a stomatal pore.
(f) An enzyme secreted by gastric glands in stomach which acts on proteins.

Q 10.

Name the red pigment which carries oxygen in blood.

Q 11.

What is the name of tiny air-sacs at the end of smallest bronchioles in the lungs ?

Q 12.

Explain how, it would benefit deep sea divers if humans also had gills.

Q 13.

In which kind of respiration is more energy released?

Q 14.

What will happen if mucus is not secreted by the gastric glands?

Q 15.

What are the final products after digestion of carbohydrates and proteins?

Q 16.

Name the green pigment present in the leaves of a plant.

Q 17.

What is the name of tiny projections on the inner surface of small intestine which help in absorbing the digested food ?

Q 18.

(a) Photosynthesis converts energy X into energy Y. What are X and Y ?
(b) State the various steps involved in the process of photosynthesis.

Q 19.

Out of photosynthesis and respiration in plants, which process occurs :
(a) all the time ?
(b) only at daytime ?

Q 20.

Name two animals which breathe through gills.

Q 21.

What are the different ways in which glucose is oxidised to provide energy in various organisms ? Give one example of each.

Q 22.

State the three common features of all the respiratory organs like skin, gills and lungs.

Q 23.

Explain why, plants have low energy needs as compared to animals.

Q 24.

What is the mode of nutrition in fungi?

Q 25.

List three characteristics of lungs which make it an efficient respiratory surface.

Q 26.

What is the other name of food pipe ?

Q 27.

Name the biological catalysts which bring about chemical digestion of food.

Q 28.

Name the process by which plant parts like roots, stems, and leaves get oxygen required for respiration.

Q 29.

Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.

Q 30.

What are the functions of the liver and the pancreas?

Q 31.

What are the living organisms that cannot make their own food called?

Q 32.

Other than chlorophyll, which other pigment is necessary for photosynthesis?

Q 33.

(a) Draw a sectional view of the human heart and label on it – Aorta, Right ventricle and Pulmonary veins.
(b) State the functions of the following components of transport system:
(i) Blood (ii) Lymph

Q 34.

A Give one reason why multicellular organisms require special organs for exchange of gases between their body and their environment. :

Q 35.

Name the process in plants where water is lost as water vapour. :

Q 36.

Why do we boil the leaf in alcohol when we are testing it for starch ?

Q 37.

From which part of the body, undigested food is egested in Amoeba ?

Q 38.

(a) What are heterotrophs ? Give one example of heterotrophs.
(b) What is the difference between autotrophic nutrition and heterotrophic nutrition ?

Q 39.

a) How do plants obtain food ?
(b) Why do plants need nitrogen ? How do plants obtain nitrogen ?

Q 40.

(a) Leaves of a healthy potted plant were coated with vaseline. Will this plant remain healthy for long ? Give reason for your answer.
(b) What will happen to the rate of photosynthesis in a plant under the following circumstances ?

  1. cloudy day in morning but bright sunshine in the afternoon
  2. no rainfall in the area for a considerable time.
  3. gathering of dust on the leaves

Q 41.

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).

Q 42.

Name the two stages in photosynthesis.

Q 43.

Name the parts of the digestive system of a grasshopper.

Q 44.

How do the guard cells regulate opening and closing of stomatal pores?

Q 45.

Explain the role of mouth in digestion of food.

Q 46.

Why is transpiration important for plants?

Q 47.

Name the acid presents in the following:
(i) Tomato (ii) Vinegar (iii) Tamarind

Q 48.

Name two excretory products other than 02 and  CO2 in plants.

Q 49.

What is the mode of nutrition in human beings?

Q 50.

What is the name of those cells in the leaf of a plant which control the opening and closing of stomata?