TS 10th Class Biology Model Paper Set 3 with Solutions

Students must rely on TS 10th Class Biology Model Papers Set 3 to gauge their understanding of exam patterns.

TS 10th Class Biology Model Paper Set 3 with Solutions

Time:1:30 hours
Max.Marks:40

Instructions:

1. Read the question paper carefully and understand.
2. Answer the questions under Part – A in the answer sheet provided.
3. Part – A contains three sections: section – I, II and III.
4. There is an internal choice to the questions under section – III.
5. Part B Answers should be written in the given brackets and attach to the Part – A answer sheet.
6. Write the answers following the instructions given in each section.

Part – A (Marks 30)
Section-I (3 x 2 = 6 M)

Instructions:

• This section contains 3 very short answer questions.
• Answer ALL the questions.
• Write answer to each question in 3 to 4 sentences.
• Each question carries 2 marks.

Question 1.
Why chloroplast are green in colour?
Answer:

1. Chloroplast are green in colour due to the presence of chlorophyll, a green-coloured pigment.
2. Chlorophyll traps the solar energy required for the photosynthesis.

Question 2.
How does exhalation takes place?
Answer:
The ribs come back to their original position the diaphragm relaxes and assumes its dome shape. The pressure increases on the lungs. The elastic tissue contracts and squeezes the air out through the nose to the external atmosphere.

Question 3.
The wall of left ventricle is thicker than the wall of the right ventricle? Give reason.
Answer:
As it pumps blood to more distant parts of the body (such as fingers and toes) to sustain high pressure of oxygenated blood the left ventricle is thicker than the right ventricle.

Section – II (3 x 3 = 9 M)

Instructions:

• This section contains 3 short answer questions.
• Answer ALL the questions.
• Write answer to each question In 5 to 6 sentences.
• Each question carries 3 marks.

Question 4.
Sunil was unable to see outside when he came out from the theatre. He doesn’t know how he come out with other audiences. What type of questions he would have got in his mind to know the reason?
Answer:

1. Why am I unable to see when I came out of the theatre?
2. How was I able see the things in the theatre though it was dark?
3. Is there any adjustment happening in the eyes? What is it?
4. After some time, how was I am able to see normally? What would be the reason?

Question 5.
Why are the small number of surviving tigers and lions a cause of worry from the points of view of genetics?
Answer:

1. Sometimes, species (either animal or plant) may die out. It may become extinct.
2. Once species is extinct its genes are lost forever. It can’t reemerge at all.
3. The small number of tigers and lions are a cause of worry from the point of view of genetics because if they all die out and become extinct, their genes will be lost forever. Overcoming generations will not be able to see tigers at all.

Question 6.
Why is dependence of man on nature greater than that of any other organism?
Answer:
Man’s dependence on the environment is greater than that of other organisms, because

1. Man develops curiosity for more comforts and security.
2. Man consumes large amounts of material and energy.
3. Man develops a new kind of social-economic environment which consists of things developed by man through tools and techniques.

Section-III (3 x 5 = 15 M)

Instructions:

• This section contains 3 essay-type questions.
• Answer ALL the questions.
• There is an internal choice for each question.
• Write answer to each question in 6 to 10 sentences.
• Each question carries 5 marks.

Question 7.
Which issues do you take into consideration to tell that plants play a key role in animals’ nutrition?
(OR)
When do you know about the human heart’s pumping method, the “circulatory system” which issue you will remember particularly? What’s the reason for that?
Answer:

1. Plants play a very important role in the nutrition of animals. Actually, plants are the producers where as animals are dependent on plants for their nutrition.
2. Many plants (or) plants’ parts are eatable as food. There are around 2000 plant species which are cultivated for food. Nutrients like carbohydrates, proteins, fats, vitamins and minerals are available from these plants.
3. Seeds of plants arc good sources of food for animals including humans because they contain many healthful fats.
4. Infact majority of the food consumed by human beings are seed based food. Edible seeds include cereals like wheat, rice, maize etc., and legumes like pea, groundnut and nuts.
5. Oil seeds are often pressed to produce rich oils like sunflower, groundnut, sesame et&
6. Seeds are typically high in unsaturated fats and considered as a health food.

(OR)
Particularly I remember about the importance of closed type of circulatory system and the double circulation in man.
In most of the animals, tubes called blood vessels are present and the heart pumps blood into the blood vessels. This type of circulatory system is called closed type of circulatory system. The heart that pumps blood to lungs for oxygenation is called pulmonary heart in man blood passes twice through the heart once between heart and lungs and second time between heart and body parts. Such a circulation is called double circulation and the heart is called double circuit heart.

Oxygenated blood enters from lungs into the left atrium and flows into left ventricle. The left ventricle pumps blood to all other body parts. The deoxygenated blood from the body parts is collected into the right atrium and flows into right ventricle. The right ventricle sends it to lungs for oxygenation.

Question 8.
Write a short note on the propagation of Rhizopus.
(OR)
Write a short note on fission. Give examples.
Answer:

1. Rhizopus propagates by means of spores.
2. It consists of fine thread projects called hyphae and thin knob-like structure called sporangia.
3. Each sporangium produces hundreds of microscopic reproductive units called spores.
4. When the spore case bursts, the spores spread into air.
5. These airborne spores land on food or soil.
6. Under favourable conditions like damp and warm conditions, they germinate and produce new individuals.

(OR)

1. Fission is the asexual method of reproduction.
2. Single-celled organisms such as paramecium and bacteria reproduce by splitting into two or more off springs.
3. If the organisms split into two, it is called binary fission.
4. When the organism splits into more cells to form more off springs it is called multiple fission.
5. This is often the only mode of reproduction in these organisms.

Question 9.
Read the following passage:
As the process of digestion in the stomach nears completion, the contractions of the stomach decrease. This prompts the muscles called as pyloric sphincter at the opening of the stomach and the first part of the small intestine or duodenum to relax. This opens the pathway into the duodenum releasing the partially digested food (chyme) in small quantities into the dude num.

Peristalsis involves the contraction of the muscles behind the food and the relaxation of the muscles in front of the food giving rise to a thrust that pushes the food forward through the digestive canal. A wave of contraction followed by relaxation in muscles help in forward movement of food.
Write answers for the following questions.
i) What is the use of the peristalsis movement?
ii) How are the peristalsis movements caused by muscles in the oesophagus?
iii) What is the role of pyloric sphincter?
iv) What is the use of duodenum?
(OR)
Write a short note on food chain and food web.
Answer:
i) The wave-like movements of the muscles in the digestive tract are called peristalsis movements. They help for the movement of food in the alimentary canal. They may occur in a regular (or) reverse manner. The reverse peristalsis, in man, is a protective mechanism to expel unwanted substances.

ii) Peristalsis is a wave-like movement caused by the contraction and relaxation of the muscles of the oesophagus. The smooth muscles of oesophagus have circular muscles in the inner layer and longitudinal muscles in the outer layer. The contraction of circular muscles behind the food and contraction of longitudinal muscles in front of the food creates a wave-like motion and food is squeezed in the tube.

iii) Tle relaxation of pyloric sphincter opens the pathway from stomach to duodenum releasing small amounts of partially digested chyme into the duodenum from time to time. Its contraction closes the pathway.

iv) Duodenum is a small tube-like connection between stomach and small intestine. The partially digested chyme enters into the duodenum from the stomach. liver and pancreas opens into the duodenum through their ducts. Bile juice from liver and pancreatic juice from pancreas enter into it and helps for the digestion of proteins and fats.

(OR)

1. A food chain is a pathway along which food is transferred from one trophic level to another trophic level beginning with producers.
2. It shows who eats what in a particular habitat.
3. The arrows, between each item in the chain always point from the food to the feeder.
4. For example Grass → Rabbit → Snake → Hawk.
5. The elaborate interconnected feeding relationships in an ecosystem is said to be food web.
6. Many of the food chains in an ecosystem are cross-linked to form food web.
7. The food chain and food web help us to understand the food relations among living things.

Part – B (Marks 10)

Instructions:

• Write the answers to the questions under Part – B on the question paper itself and attach it to the answer book of Part – A.
• Each question carries 1 mark.
• Marks will not be awarded in any case of overwriting, rewritten or erased answers.
• Write the capital letter (A / B / C / D) showing the correct answer for the following questions in the brackets provided against them.

Question 1.
Observe the picture. If iodine is used on the leaf ………………… .? ( )

A) formation of deep blue colour at the non-light falling region.
B) formation of deep blue colour at the light falling region.
C) formation of deep blue colour on both light-falling and non-light-falling regions.
D) no colour formation on both regions.
Answer:
B) formation of deep blue colour at the light falling region.

Question 2.
What is the purpose of the experiment? ( )

A) To test the presence of oxygen in respiration
B) To test the evolution of CO₂ in respiration
C) To test the evolution of heat in respiration
D) To test anabolic activity
Answer:
B) To test the evolution of CO₂ in respiration

Question 3.
Maximum rate of respiration takes place at ( )
A) 0°C
B) 45°C
C) 100°C
D) 60°C
Answer:
D) 60°C

Question 4.
The correct order! sequence of different phases of human cardiac cycle. ( )
1) Ventricle systole
2) Auricle systole
3) Ventricle diastole
4) Auricle diastole
A) 1, 2, 3, 4
B) 2, 1, 4, 3
C) 3, 1, 2,4
D) 4, 3, 2, 1
Answer:
A) 1, 2, 3, 4

Question 5.
Sequence of urine formation in nephron is ( )
A) Glomerular filtration → tubular re- absorption → tubular secretion
B) Tubular reabsorption → tubular secretion → glomerular filtration
C) Tubular secretion → glomerular filtration → tubular reabsorption
D) Tubular reabsorption → concentration of urine → tubular secretion
Answer:
A) Glomerular filtration → tubular re- absorption → tubular secretion

Question 6.
Excretory organs are first appear in ( )
A) Nematodes
B) Platyhelmenthis
C) Aves
D) Reptiles
Answer:
B) Platyhelmenthis

Question 7.
Match the following. ( )

List – A	List – B
1. Flame cells	a) Nematada
2. “Water vascular system”	b) Arthropoda
3. Green glands	c) Starfish

A) 1 – c, 2 – b, 3 – a
B) 1 – b, 2 – c, 3 – a
C) 1 – a, 2 – b, 3 – c
D) 1 – a, 2 – c, 3 – b
Answer:
D) 1 – a, 2 – c, 3 – b

Question 8.
Electrical impulses travel in a neuron from ( )
A) Dendrite → axon → axon end → cell body
B) Cell body → axon → dendrite → axon end
C) Dendrite → cell body → axon → axon terminal
D) Axon terminal → axon → cell body → dendrite
Answer:
D) Axon terminal → axon → cell body → dendrite

Question 9.
Find out the correct sentence. ( )
A) Double fertilization occurs in Angiosperms
B) Double fertilization occurs in Gymnosperms
C) Asexual reproduction occurs in all flowering plants
D) Single fertilization occurs in flowering plants.
Answer:
A) Double fertilization occurs in Angiosperms

Question 10.
The scientist who expelled his research views by thinking, though he has poor eyesight is ( )
A) Theodor Boyen
B) Wilhelm Roux
C) Waither Flemming
D) August Weismann
Answer:
D) August Weismann