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All Types of Important Question of CBSE Class 10 Science Ch.6 LIFE PROCESSES

CBSE Class 10 Science Chapter 6 Life Processes Biology Pdf free download is part of Class 10 Science Notes for Quick Revision. Here we have given all type of important question of life process class 10. According to new CBSE Exam Pattern, MCQ Questions for Class 10 Science pdf Carries 20 Marks. class 10 science ch 6

we include all important question of life process class 10th in this article so that the student can prepare for their board exam with practice.  

• IMPORTANT MCQ 

Q.1. In which vertebrate group(s), heart does not pump oxygenated blood to various parts of body?

(a) Pisces

(b) Pisces and amphibians

(c) Amphibians

(d) Amphibians and reptiles

Ans. (a) Pisces

Q.2. To prevent the entry of food into the trachea the opening is guarded by

(a) glottis

(b) epiglottis

(c) soft plate

(d) hard palate

Ans. (b) epiglottis

Q.3. The food reserve for energy in producers (autotrophs) is

(a) fat

(b) protein

(c) starch

(d) glycogen

Ans. (c) starch

Q.4. Oxygen released during photosynthesis is derived from

(a) water

(b) carbon dioxide

(c) glucose

(d) chlorophyll

Ans. (a) Water

Q.5. First step in photosynthesis is

(a) release of O2 and absorption of CO2

(b) breakdown of water

(c) formation of Glucose

(d) absorption of light energy by chlorophyll

Ans. (d) absorption of light energy by chlorophyll

Q.6. In which part of human digestive tract common bile duct opens ?

(a) Large intestine

(b) Duodenum

(c) Stomach

(d) Liver

Ans. (b) Duodenum

Q.7. Which of the following protects inner lining of stomach from hydrochloric acid secreted by gastric glands?

(a) Pepsinogen

(b) Pepsin

(c) Bile juice

(d) Mucus

Ans. (d) Mucus

Q.8. Salivary amylase secreted by salivary glands is responsible for which event in mouth?

(a) Break-down of protein in amino acid 

(b) Break-down of fat in lipids

(c) Break-down of starch in sugar

(d) Both (b) and (c)

Ans. (c) Break-down of starch in sugar

Q.9. In which part of the alimentary canal complete digestion and absorption of food takes place?

(a) Duodenum 

(b) Small intestine 

(c) Colon

(d) Stomach

Ans. (b) Small intestine

Q.10. In our body during the process of respiration exchange of gases takes place in

(a) lungs and throat

(b) alveoli and throat

(c) alveoli of lungs

(d) larynx and lungs

Ans. (c) alveoli of lungs

Q.11. Which of the following statement(s) is (are) true about respiration ?

(i) During exhalation, ribs move inwards and diaphragm is lowered.

(ii) Exchange of gases takes place in alveoli.

(iii) During inhalation, ribs move outwards and diaphragm is lowered.

(iv) Haemoglobin has greater affinity for carbon dioxide.

(a) (i) and (ii)

(b) (ii) and (iii) 

(c) (i) and (iv)

(d) (iii) and (iv)

Ans. (b) (ii) and (iii) 

Q.12. Backflow of blood inside the heart is prevented during contraction by

(a) thick muscular wall of left ventricle 

(b) thin walls of atria

(c) valves present in heart

(d) All of the above

Ans.  (c) valves present in heart

Q.13. Extra cellular fluid in our tissues is also known as

(a) plasma

(b) serum

(c) lymph

(d) albumin

Ans. (c) lymph

Q.14. Which is the first enzyme to mix with food in digestive tract ?

(a) Pepsin

(b) Cellulose

(c) Amylase

(d) Trypsin

Ans. (c) Amylase

Q.15. Four statements are given below about human heart. Which one of them is/are correct?

(i) Right auricle receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of body.

(ii) Left auricle sends oxygenated blood to right ventricle which pumps it to different parts of body.

(iii) Left auricle receives oxygenated blood from different parts of body while right auricle

receives deoxygenated blood from lungs.

(iv) Left ventricle pumps oxygenated blood to different body parts while right ventricle

pumps deoxygenated blood to lungs.

(a) (i) and (iv)

(b) (i)

(c) (i) and (ii)

(d) (ii) and (iv)

Ans. (a) (i) and (iv)

Q.16. Which of the following statements is true about arteries ?

(a) Arteries possess thick elastic wall without valves inside, blood flows under high pressure

and carry blood away from the heart to different parts of the body.

(b) Thin walls of arteries have valves inside and blood flows with low pressure and carry it

away from the heart to different organs.

(c) They possess thick elastic walls, blood flows under low pressure; carry blood from the

heart to various parts of the body.

(d) They possess thick elastic walls, blood flows under high pressure; collect blood from

different organs and bring it back to the heart.

Ans. (a) Arteries possess thick elastic wall without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body.

Q.17. Which of the following events does not take place during photosynthesis ?

(a) Conversion of light energy to chemical energy.

(b) Oxidation of carbon to carbon dioxide.

(c) Reduction of CO2 to carbohydrates.

(d) Splitting of water.

Ans. (c) Reduction of CO2 to carbohydrates.

Q.18. In which group of the organism listed below food material is broken down outside the body and absorbed ?

(a) Tapeworm, Amoeba, Paramecium

(b) Cuscuta, Mosquito, Tapeworm

(c) Rhizopus, Mushroom, Yeast

(d) Mushroom, Rhizopus, Green plants

Ans. (c) Rhizopus, Mushroom, Yeast

Q.19. Tracheal respiration occurs in:

(a) earthworm 

(b) insects

(c) protists

(d) fish

Ans. (b) insects

Q.20. Urea is a nitrogenous excretary product which is formed in

(a) kidney

(b) liver

(c) pancreas

(d) intestine

Ans. (a) kidney

Q.21. The common step between aerobic and anaerobic respiration takes place in :

(a) cytoplasm

(b) mitochondria

(c) chloroplast

(d) golgi complex

Ans. (a) cytoplasm

Q.22. The blood leaving the kidney has

(a) more urea and less oxygen

(b) less urea and more oxygen

(c) less urea and less oxygen

(d) less urea and less carbon dioxide

Ans. (c) less urea and less oxygen

Q.23. Movement of food through the oesophagus is due to:

(a) lubrication by saliva

(b) peristalsis

(c) diffusion

(d) turgor pressure

Ans. (b) peristalsis

Q.24. When few drops of iodine were poured on a potato slice, the potato turned blue-black in colour. This indicates that potato contains

(a) sugar

(b) starch

(c) glycogen

(d) proteins

Ans. (b) starch

• IMPORTANT VERY SHORT ANSWER TYPE QUESTIONS

Q.1. What are the life processes?

Ans. The processes which together perform this maintenance job are life processes.

Q.2. Name a plant parasite.

Ans. Amarbel (cuscuta) is an example of parasitic plant.

Q.3. What is the mode of nutrition in fungi ?

Ans. Saprophytic or parasitic mode of nutrition is seen in the members of kingdom fungi.

Q.4. What is stomata ?

Ans. The tiny pores present on the surface of leaves is called stomata.

Q.5. What is succus entericus ?

Ans. Juice secreted by glands present in intestinal wall is known as succus entericus. It contains digestive enzymes.

Q.6. What is the mode of nutrition in Plasmodium ?

Ans. Plasmodium exhibits parasitic mode of nutrition.

Q.7. Where pancreas is located ?

Ans. Pancreas is located beneath the stomach in between the limbs of the 'U' shaped duodenum.

Q.8. Why plants appear green in colour ?

Ans. Plants appear green in colour due to presence of green pigment chlorophyll. Secondly

it reflects green light of the visible spectrum.

Q.10. Write full name of

(i) ADP

(ii) ATP

Ans.  (i) ADP = Adenosine Di Phosphate.

(ii) ATP  = Adenosine Tri Phosphate.

Q.11. How many pairs of salivary glands are present in human beings ?

Ans. Three pairs of salivary glands are present in human beings.

Q.12. In which type of medium pepsin and gastric lipase work?

Ans. Pepsin and gastric lipase work best in acidic medium.

Q.13. What are villi ?

Ans. Finger-like projections present on the inner lining of small intestine are called villi.

Q.14. Name the factors which affect photosynthesis.

Ans. Light, CO2 concentration, temperature and water are the factors which affect

photosynthesis.

Q.15. Name the digestive enzyme present in saliva.

Ans. Ptyalin or salivary amylase is present in saliva.

Q.16. Where bile is stored ?

Ans. Bile is stored in gallbladder.

Q.17. Name the hormones secreted by pancreas.

Ans. Insulin and glucagon are the hormones secreted by pancreas.

• IMPORTANT  SHORT ANSWER TYPE QUESTIONS 

Q.1. Stomata of desert plants remain clased during daytime. How do they take up co

and perform photosynthesis ?

Ans. Desert plants take up Co, at night and prepare an intermediate molecule. This

intermediate molecule is acted upon by the energy absorbed by the chlorophyll during the day

Q.2. Two green plants are kept separately in oxygen free containers, one in the dark and the other in continuous light. Which one will live longer and give appropriate reason for the same ?

Ans. Plant kept in continuous light will live longer because it will be able to provide oxygen

required for its respiration, by the process of photosynthesis,

Q.3. Define peristalsis and give its significance.

Ans. Rhythmic contraction and relaxation of muscles of alimentary canal with the help of

which food is propelled in forward direction are called as peristaltic movements.

Q.4. When a sportsman runs, he gets muscle cramps. Why?

Ans. During running, the sportsman requires large amount of energy instantly. In order to

relcase more energy, pyruvate is converted into lactic acid in the absence of oxygen Accumulation of lactic acid in the muscles causes cramps.

Q.5. What would be the consequence of deficiency of haemoglobin in our bodies ?

Ans. Haemoglobin is a carrier of oxygen. Deficiency of haemoglobin will adversely affect

the supply of oxygen to the cells, causing anaemia. Secondly aerobic respiration will be affected leading to weakness, pain and improper metabolism.

Q.6. Name the factors on which the amount of water reabsorbed along the tubular part of nephron depends.

Ans. Amount of water reabsorbed by nephron depends on following two factors:

(1) How much excess water is present in the body.

(2) How much dissolved waste is to be excreted out of the body.

Q.7. What is the structural and functional unit of kidney and tell about its role in our

Ans. Nephron is the structural and functional unit of kidney. It plays a vital role in filtration

of blood, reabsorption of useful components like sodium, potassium, calcium, chloride, bicarbonate

and water as well as secretion of waste products from blood.

Q.8. Give the functional aspect of an artificial kidney.

 body?

 Ans. The functional aspect of artificial kidney is that it helps in removing toxins from the

body before they are able to damage the body permanently. It also maintains the balance of

Q.9. What is the primary toxic waste in our blood filtered by the kidneys ?

Ans. Urea and uric acid are the primary toxic wastes in our blood filtered by the kidneys.