CBSE Class 10 Biology Life Processes Worksheet Set 10

This printable worksheet for CBSE Class 10 Science Chapter 5, Life Processes, has 25 short questions with answers: fill in the blanks, true or false statements, a numerical on blood pressure and short answer questions. It revises enzymes and their substrates, blood circulation through the heart, respiration and the experiments on carbon dioxide, and the pages print neatly for classroom practice.

Fill in the Blanks

Question 1. ................ causes emulsification of fats.
Answer:
Bile (bile salts).
Bile breaks the large fat globules into tiny droplets in the small intestine.
In simple words: Bile breaks the large fat globules into tiny droplets in the small intestine.

Teacher's Note:
1. Write the exact biological term.
2. Spell the term correctly.

Question 2. ................ involves the intake of complex material made by other organisms.
Answer:
Heterotrophic nutrition.
Heterotrophs cannot make their own food and depend on others.
In simple words: Heterotrophs cannot make their own food and depend on others.

Teacher's Note:
1. Write the exact biological term.
2. Spell the term correctly.

Question 3. Gaseous exchange in lungs takes place in units called ................ .
Answer:
Alveoli.
Alveoli are thin-walled sacs surrounded by capillaries.
In simple words: Alveoli are thin-walled sacs surrounded by capillaries.

Teacher's Note:
1. Write the exact biological term.
2. Spell the term correctly.

Question 4. Contraction of diaphragm contributes to ................ .
Answer:
Inhalation (breathing in).
The diaphragm flattens and moves down, and the chest cavity becomes larger so air rushes in.
In simple words: The diaphragm flattens and moves down, and the chest cavity becomes larger so air rushes in.

Teacher's Note:
1. Write the exact biological term.
2. Spell the term correctly.

Question 5. Yeast undergoes ................ fermentation.
Answer:
Alcoholic.
Yeast converts glucose into ethanol and carbon dioxide without oxygen.
In simple words: Yeast converts glucose into ethanol and carbon dioxide without oxygen.

Teacher's Note:
1. Write the exact biological term.
2. Spell the term correctly.

Question 6. The major function of the ................ blood cells is to transport oxygen.
Answer:
Red.
The red blood cells have haemoglobin, which carries oxygen.
In simple words: The red blood cells have haemoglobin, which carries oxygen.

Teacher's Note:
1. Write the exact biological term.
2. Spell the term correctly.

Question 7. Transport through phloem is an ................ process.
Answer:
Active (energy-requiring).
Translocation in the phloem uses energy from ATP.
In simple words: Translocation in the phloem uses energy from ATP.

Teacher's Note:
1. Write the exact biological term.
2. Spell the term correctly.

Question 8. The chamber of heart that pumps oxygenated blood to the whole body is ................ .
Answer:
The left ventricle.
It has the thickest wall and sends blood out through the aorta.
In simple words: It has the thickest wall and sends blood out through the aorta.

Teacher's Note:
1. Write the exact biological term.
2. Spell the term correctly.

Question 9. In humans, primary nitrogenous waste is ................ .
Answer:
Urea.
Urea is formed in the liver from ammonia and is removed by the kidneys.
In simple words: Urea is formed in the liver from ammonia and is removed by the kidneys.

Teacher's Note:
1. Write the exact biological term.
2. Spell the term correctly.

True or False

Question 10. Translocation is the transportation of the products of photosynthesis.
Answer:
True. Translocation carries the food made in the leaves through the phloem.
In simple words: Translocation carries the food made in the leaves through the phloem.

Teacher's Note:
1. Read the statement carefully.
2. If it is false, write the correct fact.

Question 11. The exchange of nutrients and waste products between the blood and cells occurs within the arteries.
Answer:
False. The exchange takes place through the thin walls of the capillaries.
In simple words: The exchange takes place through the thin walls of the capillaries.

Teacher's Note:
1. Read the statement carefully.
2. If it is false, write the correct fact.

Question 12. Only the multicellular organisms require transporting mechanisms.
Answer:
False. Even unicellular organisms move materials inside the cell, although they do it by diffusion and cytoplasmic movement.
In simple words: Even unicellular organisms move materials inside the cell, although they do it by diffusion and cytoplasmic movement.

Teacher's Note:
1. Read the statement carefully.
2. If it is false, write the correct fact.

Question 13. Humans have an open circulatory system.
Answer:
False. Humans have a closed circulatory system, in which blood stays inside the vessels.
In simple words: Humans have a closed circulatory system, in which blood stays inside the vessels.

Teacher's Note:
1. Read the statement carefully.
2. If it is false, write the correct fact.

Question 14. In humans, the alveoli are the functioning units of external respiration.
Answer:
True. Gas exchange between air and blood takes place in the alveoli.
In simple words: Gas exchange between air and blood takes place in the alveoli.

Teacher's Note:
1. Read the statement carefully.
2. If it is false, write the correct fact.

Question 15. In photosynthesis, carbon dioxide is given out by diffusion process.
Answer:
False. Carbon dioxide is taken in by diffusion through stomata and oxygen is given out.
In simple words: Carbon dioxide is taken in by diffusion through stomata and oxygen is given out.

Teacher's Note:
1. Read the statement carefully.
2. If it is false, write the correct fact.

Question 16. Bowman’s capsule is found in heart.
Answer:
False. It is a part of the nephron in the kidney.
In simple words: It is a part of the nephron in the kidney.

Teacher's Note:
1. Read the statement carefully.
2. If it is false, write the correct fact.

Question 17. Guard cells have chloroplast.
Answer:
True. Guard cells contain chloroplasts, unlike the other epidermal cells.
In simple words: Guard cells contain chloroplasts, unlike the other epidermal cells.

Teacher's Note:
1. Read the statement carefully.
2. If it is false, write the correct fact.

Short Answer and Numerical Questions

Question 18. Name the following:
(i) Mode of nutrition of the cuscuta plant.
(ii) First form of food substance produced during photosynthesis.
(iii) Organisms which live on or inside the body of another organism and depend on it for food.
(iv) Small openings present on leaf surface.
Answer:
(i) Parasitic nutrition.
(ii) Glucose.
(iii) Parasites.
(iv) Stomata.
In simple words: Cuscuta is a parasite; glucose is the first food; parasites live on a host; stomata are the leaf pores.

Teacher's Note:
1. Give one word for each part.
2. Cuscuta lives on other plants.

Question 19. Delete the word or words which are inappropriate from the following reactions:
(i) Starch + proteins → (salivary amylase) → Maltose
(ii) Pepsinogen → (HCl) → Peptides + Pepsin
Answer:
(i) Delete proteins. Salivary amylase acts only on starch to form maltose: Starch → (salivary amylase) → Maltose.
(ii) Delete peptides. In the presence of HCl the inactive pepsinogen is changed into the active enzyme pepsin: Pepsinogen → (HCl) → Pepsin.
In simple words: Amylase works on starch only, and HCl changes pepsinogen into pepsin.

Teacher's Note:
1. Check that each enzyme has only its own food.
2. Pepsinogen is the inactive form of pepsin.

Question 20. Using the following information form a pathway showing the flow of blood through heart. And also include information that are not mentioned below to complete it.
Left ventricle, inferior vena cava, superior vena cava, tricuspid valve, left auricle, bicuspid valve, right auricle, lungs, right ventricle, pulmonary vein.
Answer:
Right side of the heart: Superior vena cava + Inferior vena cava (bring deoxygenated blood from the body) → Right auricle → (tricuspid valve) → Right ventricle → Pulmonary artery → Lungs (the blood is oxygenated).
Left side of the heart: Lungs → Pulmonary vein (oxygenated blood) → Left auricle → (bicuspid valve) → Left ventricle → Aorta → the rest of the body.
In simple words: Body to right side, then lungs, then left side, then body again.

Teacher's Note:
1. Add the missing pulmonary artery and aorta.
2. Name the valve between each auricle and ventricle.

Question 21. If a person has a systolic pressure of 140 mm of Hg and the pulse pressure is 40 mm of Hg. Solve it with the help of this information and find out the diastolic pressure.
Answer:
Pulse pressure is the difference between the systolic and the diastolic pressure.
Pulse pressure = systolic pressure − diastolic pressure
40 = 140 − diastolic pressure
Diastolic pressure = 140 − 40 = 100 mm of Hg.
In simple words: Subtract the pulse pressure from the systolic pressure: 140 − 40 = 100 mm of Hg.

Teacher's Note:
1. Write the formula before substituting.
2. The normal diastolic pressure is 80 mm Hg, so this person has high blood pressure.

Question 22. Name the correct substrates for the following enzymes:
(i) Trypsin
(ii) Amylase
(iii) Pepsin
(iv) Lipase
Answer:
(i) Trypsin: proteins (and peptones).
(ii) Amylase: starch.
(iii) Pepsin: proteins.
(iv) Lipase: fats (emulsified fats).
In simple words: Amylase acts on starch, pepsin and trypsin on proteins, and lipase on fats.

Teacher's Note:
1. The substrate is the food on which the enzyme acts.
2. Match each enzyme with carbohydrate, protein or fat.

Teacher's Note:
1. Match the easiest pair first.
2. Excretion means removal of wastes.

Question 24. Name the energy currency in the living organisms. When and where is it produced?
Answer:
The energy currency of the cell is ATP (adenosine triphosphate).
It is produced during cellular respiration, when glucose is broken down. Most of it is made in the mitochondria, and a little in the cytoplasm. In green plants it is also made in the chloroplasts in the light phase of photosynthesis.
ATP is used to supply energy for the activities of the cell.
In simple words: ATP is the cell’s energy coin, made during respiration.

Teacher's Note:
1. Give ATP in full.
2. Say when and where.

Question 25. During the experiment to demonstrate that carbon dioxide is produced during respiration, why do we use:
(i) KOH pellets
(ii) Germinating seeds
Answer:
(i) KOH pellets absorb the carbon dioxide released by the germinating seeds. This makes a partial vacuum, so water rises in the delivery tube.
(ii) Germinating seeds are in an active growth phase, so they respire actively and release carbon dioxide.
In simple words: KOH absorbs the carbon dioxide, and germinating seeds respire fast.

Teacher's Note:
1. Name the reason for each material.
2. Keep the seeds moist.