Explore topic-wise InterviewSolutions in .

(1) IVF means In Vitro Fertilization (IVF)

(2) This is the technique in the modern medical field where childless couples can be blessed by their own child.

(3) IVF technique is used for childless couples who are faced with problems such as less sperm count, obstacles in oviduct, etc.

(4) The IVF technique is done by removing the oocyte from the mother and artificially fertilizing by the sperms collected from father. This fertilization is done in a test-tube. Thus it is also called test tube baby. The embryo formed is implanted in uterus of real mother or a surrogate mother at appropriate time.

IVF: In Vitro Fertilization is the technique in which fertilization is brought about outside the female body but in the test-tube and the embryo is implanted in uterus of woman.

Ovulation: Bursting of mature ovarian follicle under the influence of hormones to release the oocyte is called ovulation.

Corpus luteum: Corpus luteum is the secondary structure that is formed from empty ovarian follicle after ovulation. This corpus luteum produces progesterone and thereby maintains pregnancy.

Corpus albicans: Corpus albicans is the degenerate body which is formed from corpus luteum, if the ovum is not fertilized.

Hypertension.

Kidneys are bean-shaped organs meant for excretion. In human body, they are located in the upper abdominal area. The two kidneys are present opposite to each other, one on each side of the backbone.

• In plants, waste substances are stored in the vacuoles of fruits and flowers. So, they fall off after some time to excrete these wastes. 
• Also, when fruits and flowers mature, the supply of nutrients to mature fruits and flowers is blocked. This causes abscission in that part of the plant leading to their detachment from the plant body and falling off.

• Most of the transport in plants occur through passive transport which does not require energy and plants stand still at one place and they will not travel in search of food.
•  Hence Plants require low energy compared to animals.

• Platelets are responsible for the clotting of the blood. 
• If platelets are absent blood will not clot.
• In case of injuries blood flow cannot be stopped without clotting and this may prove fatal for the person.

The waste products formed in our body through metabolic activities are urea, uric acid, ammonia, carbon dioxide etc.

• Resin, gum etc. are the waste products of plants. They are given out after some time as a process of excretion in plants. 
• Many plants, particularly, woody plants produce resin and gum in response to injury. These resin and gum act as bandage protecting the plants from invading insects and pathogens.

Vena Cava is the other name of main vein.

Carbon dioxide and urea.

(i) Yes, plants depend on solar energy to produce food. They require energy from sunlight to perform photosynthesis. If sunlight is not available, they will not be able to make their own food. 

(ii) We (humans) are heterotrophic organisms. We obtain nutrition from plant and animal resources. We use plant products as food. All organisms require nutrition, but they use different strategies. Some organisms consume food by breaking down it into smaller parts. Unicellular organisms like Amoeba use pseudopodia to gather food.

(iii) Removal of green cover (deforestation) leads to serious problems. It has a negative impact on our environment and our lives. As we are directly dependent on plants and trees for our food, our survival will be at risk. Deforestation leads to climatic changes. It is a major cause for global warming. Moreover, animals are also badly affected. Their habitats are destroyed.

1.b. Adenosine tri-phosphate

2.a. Absorption of water

3.a. TRUE

4.c. Pepsin needs an acidic medium to work upon proteins.

5.c. Liver

(1) Haemoglobin – blood

(2) Ossein – bones.

(1) Keratin – skin

(2) Myosin – muscles.

Since ventricles have to pump blood into various organs, they have thicker muscular walls than atria do.

Breathing is the process of letting in oxygen from the air into the lungs and CO₂ out of the lungs.

Mechanism: Involuntary, rate controlled by the brain. outward and inward movement of ribs increases or decreases the space of thoracic cavity, action assisted by diaphragm continuous inhalation and exhalation of the air.

Detailed Answer: 

A physical process by which oxygen is taken in and carbon dioxide is given out is called breathing. 

Breathing in humans involves three steps : 

(i) Inspiration: When we breathe in, ribs move up and flatten the diaphragm due to which the chest cavity becomes larger. As a result, air is sucked into the lungs and fills the expanded alveoli. 

(ii) Gaseous exchange: Haemoglobin binds with the oxygen and carries it along the blood in the body. As blood passes through the tissues of the body, oxygen from the blood diffuses into the cell, whereas carbon dioxide which is produced during respiration diffuses into the blood and is carried to the lungs for expiration. 

(iii) Expiration: Itibs move down and diaphragm becomes dome-shaped decreasing the chest cavity. Thus, pushing the air out from lungs.

Correct option (D) Memory and learning

Explanation: 

Autonomic neural system is responsible for the control of involuntary functions of the body, e.g., peristalsis, digestion, excretion, sweating, beating of heart, etc. lt is not concerned with memory and learning.

Correct option  (A) Potassium hydroxide 

Explanation: 

ln the given experiment, plant is destarched first and then kept in the bell jar along with potassium hydroxide in a watch-glass. When this setup is kept in sunlight for few hours and is then tested for starch, it will show negative result. This shows that plant fails to get CO₂ to perform photosynthesis because CO₂ gets absorbed by potassium hydroxide.

1.a. Cellular

2.b. Respiration

3.c. Energy

4.a. ATP

5.d. All the options

1. a. Stomach

2. d. All the options

3. b. Oesophagus

4. a. Muscular walls

5. c. Buccal Cavity

1. In our body there is 65-70% water. This proportion is always maintained. 

2. Sometimes we lose lots of water either through perspiration or due to unavailability of water for a long time. In such situations, we experience dryness in our mouth. 

3. Dryness is a natural feeling which creates urge in us to drink water, thereby the proportion of water in the body is brought back to its normal levels.

1. Loose motions cause lot of loss of water from the body. 

2. This may result in dehydration. This can be lethal if ignored.

3. Especially in case of young children this is a very serious fatal problem. 

4. Thus, to bring back the normal proportion of water and electrolytes, oral rehydration solution or ORS is given to the patient who suffers from loose motions.

• The cells in which chromosome number is double are known as diploid cells.
• Male and female gametes unite together in the process of fertilization. Their chromosomes mix together in the zygote, therefore, the chromosome number is always diploid.
• E.g. Diploid chromosome no. in human beings is 46. We hate 46 chromosomes in each of our body cells.

1. During summer, the environmental temperatures are high.

2. This causes rise in our body temperature. Exercising also cause rise in the temperature. But since we can regulate our body temperature to a constant level, the sweat, glands g6t automatically stimulated.

3. This induces perspiration.

4. The sweat evaporates and causes fall in the body temperature. Thus, for regulation of body temperature, we sweat during summer or even after heavy exercise.

Xylem in plant transports water and dissolved mineral nutrients from the roots to all parts of the vascular plant. So, if xylem is removed from the plant, the water and mineral supply to the plant will stop and therefore, the plant will die.

Two structural features of small intestine are: 

(i) Villi is present to increase the absorptive surface area. 

(ii) Lacteals in the villi receive the products of fat digestion.

Chlorophyll can absorb solar energy.

Nitrogen, phosphorus, iron and magnesium.

Leaves chlorophyll mainly present in a plant .

The mode of nutrition in Amoeba is holozoic. It feeds on unicellular plant or animal. The various steps of nutrition are ingestion, digestion, assimilation and egestion. When Amoeba comes in contact with food particles, it sends out pseudopodia, which engulfs the prey by forming a food cup, which is known as ingestion. When the tips of the encircling pseudopodia touch each other, the food is encaptured into a bag called food vacuole. The food vacuole serves as a temporary stomach secreting digestive juice, this step is known as digestion. The digested food gets absorbed and diffuses into the cytoplasm and then assimilated. Egestion of undigested food takes place at any point on the surface of the body.

1.b. Bread moulds, yeast and mushrooms.

2.a. Cats, Humans and Wild animals

3.b. Many

4.c. Parasitic

5.b. Saprophytic

We have given Class 10 Multiple Choice Questions of Life Processes with a detailed clarification of answers. MCQ Questions make it simple to get a handle on the top to the bottom concept of the question. 

Check MCQ Questions for Class 10 Science Life Processes to prepare for the objective type question that will appear in Board Exams.

Practice Class 10 Science MCQ Questions of Life Processes

1. The filtration units of kidneys are called –

(a) Ureter
(b) Urethra
(c) Neurons
(d) nephrons.

2. The mode of nutrition found in fungi is:

(a) Parasitic nutrition
(b) Holozoic nutrition
(c) Autotrophic nutrition
(d) Saprotrophic nutrition

3. The enzymes pepsin and trypsin are secreted respectively by

(a) Stomach and pancreas
(b) Salivary gland and stomach
(c) Liver and pancreas
(d) Liver and salivary gland

4. Which of the following help in protecting the inner lining of the stomach from the harmful effect of hydrochloric acid?

(a) Mucus
(b) Pepsin
(c) Trypsin
(d) Bile

5. The site of photosynthesis in the cells of a leaf is

(a) chloroplast
(b) mitochondria
(c) cytoplasm
(d) protoplasm

6. Main site of photosynthesis

(a) Leaf
(b) Stem
(c) Chloroplast
(d) Guard cells

7. One cell-thick vessels are called

(a) Arteries
(b) Veins
(c) Capillaries
(d) Pulmonary artery

8. Blood consist of what fluid medium?

(a) Lymph
(b) Platelets
(c) Plasma
(d) All of these

9. Sometimes we get painful cramps in our leg muscles after running for a long time due to the accumulation of:

(a) Hydrochloric acid
(b) Fat
(c) Carbon dioxide
(d) Lactic acid

10. The vein which brings clean blood from the lungs into the heart is known as:

(a) Pulmonary vein
(b) Hepatic vein
(c) Superior vena cava
(d) Pulmonary artery

11. Select the correct statement -

(a) Hetrotrophs make their food
(b) Heterotrophs utilize solar energy to make food
(c) Heterotrophs do not make their own food
(d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

12. Which out of them is raw material for photosynthesis?

(a) carbon dioxide
(b) water
(c) oxygen
(d) all

13. Which of these is the simplest form of food?

(a) rice
(b) wheat
(c) Butter
(d) Glucose

14. The enzyme responsible for the digestion of proteins in the small intestine is:

(a) Pepsin
(b) Trypsin
(c) Amylase
(d) Lipase

15. The back flow of blood during the pumping of blood by heart is prevented by:

(a) Walls of ventncles
(b) Walls of atrium
(c) Valves in heart
(d) Walls between atria and ventricles

16. The process of digestion is completed by:

(a) Intestinal juice
(b) trypsin
(c) bile juice
(d) pepsin

17. The process of diffusion of solvent particles from the region of less solute concentration to a region of high solute concentration through semi-permeable membrane is known as

(a) Diffusion
(b) Osmosis
(c) Translocation
(d) Transpiration

18. Which of the following are energy foods?

(a) Carbohydrates and fats
(b) Proteins and mineral salts
(c) Vitamins and minerals
(d) Water and roughage

19. The largest gland in human body is:

(a) liver
(b) gastric glands
(c) pancreas
(d) salivary glands.

20. The excretory unit of the human excretory system is known as:

(a) Nephridia
(b) Neuron
(c) Nephron
(d) kidneys

Answer key

1. (d) nephrons
2. (d) Saprotrophic nutrition
3. (a) Stomach and pancreas

Explanation: Stomach secretes the enzyme pepsin and pancreas produces trypsin. Both of them breakdown protein.
4. (a) Mucus

Explanation: Mucus is a viscous secretion that protects the inner lining of the stomach from the action of HCl.
5. (a) chloroplast
6. (c) Chloroplast
7. (c) Capillaries
8. (c) Plasma
9. (d) Lactic acid

Explanation: The build-up of lactic acid in our muscles while running (less oxygen conditions) causes cramps.
10. (a) Pulmonary vein

Explanation: The pulmonary vein is responsible for bringing oxygenated and pure blood into the heart.
11. (c) Heterotrophs do not make their own food
12. (d) all
13. (d) Glucose
14. (b) Trypsin
15. (c) Valves in heart
16. (a) Intestinal juice
17. (b) Osmosis

Explanation: The diffusion of solvent particles from a region of less concentration to high concentration (concentration gradient) through a semi permeable membrane is called osmosis.
18. (a) Carbohydrates and fats
19. (a) liver
20. (c) Nephron

Explanation: Each kidney has large numbers of filtration units called nephrons.

Click here to practice more MCQ Questions from Chapter Life Processes Class 10 Science

The digestive enzymes converts proteins to amino acids, complex carbohydrates into glucose and fat into fatty acids and glycerol.

The digestive enzymes assist in digestion and absorption of nutrients in the small intestine. In the process of digestion, the salivary gland produces saliva in the mouth which digests the starch in food to make food soluble and smooth. Pancreas secrete insulin, glucagon and pancreatic juice. The pancreatic enzymes help in digestion of protein, fat and carbohydrates present in the food. Liver produces bile salts which breakdown lipids to fatty acids.

(i) – (c)

(ii) – (a)

(iii) – (d)

(iv) – (b)

Digestion of fat takes place in the small intestine. Bile emulsifies fats and breaks them into smaller fat globules. Lipase secreted from the pancreas split fat into fatty acids and glycerol.

Correct option is: (b) Beta cells

Pancreas secrete insulin, glucagon and pancreatic juice. Insulin and glucagon function to control the blood sugar levels of our body. The pancreatic enzymes help in digestion of protein, fat and carbohydrates present in the food.

(i) – (c)

(ii) – (a)

(iii) – (d)

(iv) – (b)

Liver secretes bile which helps in the emulsification of fats. Pancreas secretes pancreatic juice which emulsifies starch, proteins and fats.

The urine is stored in urinary bladder, which is a muscular sac composed of smooth muscles that are able to relax and contract. The pressure built inside the expanded bladder due to storage of urine leads to the urge to urinate. As the activity of urinary bladder is under the control of nervous system, the urge to urinate can be controlled.

The organism in which the cell membrane acts as a respiratory surface is Amoeba. In amoeba, the unicellular animal, the exchange of gases takes place through the cell membrane or the plasma membrane. The cell membrane of amoeba absorbs oxygen from the surrounding area and release carbon dioxide by the process of diffusion.

In almost all the organisms the breathing surface is very fine and delicate for easy and fast exchange of gases. Since they are very delicate they must be protected from external environmental conditions. So for protection these structures are covered well in a layer of tissues. Like in human beings the exchange of gases take place through alveoli which are present in the lungs which are further protected from environment by ribs and diaphragm.

The essential feature of respiratory organs of terrestrial animals is that they must be protected under layers of tissue so as to avoid any shock or damage. They must also be supplied with a large number of blood vessels for easy and fast exchange of gases.