TS 10th Class Biology Question Paper June 2024

Students must rely on TS 10th Class Biology Model Papers TS 10th Class Biology Model Paper June 2024 to gauge their understanding of exam patterns.

TS 10th Class Biology Question Paper June 2024

Parts – A and B

Time : 1:30 hrs.
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. Part – B Answers should be written in the given brackets and attach to the Part – A answer sheet.
5. Write the answers by following the instructions given in the each section.

Part – A
Section – I (3 × 2 = 6 M)

Time : 1 Hour 15 min.
Marks: 30

Instructions :
i) This section contains 3 very short answer questions.
ii) Answer ALL the questions.
iii) Write the answers in 3 – 4 sentences.
iv) Each question carries 2 marks.

Question 1.
What are the observations of the experiment conducted to determine the action of saliva on flour?
Answer:
1. Observations:
a) The solution of the test tube to which saliva is added shows colour change as starch is converted to sugar.
b) There is no colour change in the other test tube to which saliva is not added.
The enzyme amylase in the saliva breaks down the starch molecules into smaller sub – units usually into sugars.

Question 2.
What will happen if hormones are not secreted by the Pituitary gland in human body?
Answer:
When the Pituitary gland does not make enough of one or more of the pituitary hormones this is called HYPOPITUITARISM.
This in turn affects hormones produced by other glands in the body. The signs and symptoms can appear very slowly. They also vary from person to person.

Question 3.
Suggest any two measures for the conservation of Kolleru lake.
Answer:
a) A boundary at the five feet contour of Kolleru lake is the best way to ensure optimum holding capacity and minimise the flood impact of India’s biggest fresh water lake.

b) Ensuring inflow into the lake, which have balanced the reservoir’s character, identifying sources of pollution and treat them at entry level.

c) Sluice gates to be constructed across the two outlets to monitor and control sea water inflow during tidal fluctuations and expected rainfall events etc.

Section – II (3 × 4 = 12 M)

Instructions :
i) This section contains 3 short answer questions.
ii) Answer ALL the questions.
iii) Write the answers in 5 – 6 sentences.
iv) Each question carries 4 marks.

Question 4.
Describe any two evidences of Evolutiori with examples.
Answer:
Some of the evidences of evolution are:

1. Homologous and analogous organs.
2. Evidences from embryology and
3. Evidences from fossils.

Evidence from embryology:

1. There are remarkable similariites in the embryos of different animals from fish to man.
2. The resemblance is so close that at an early, stage even an experienced embryologist would find difficulty to distinguish one embryo from the other.
3. This strengthens the view of the existence of a common ancestor from which all these have evolved.

Evidence from fissils:

1. Fossils are evidences of ancient life forms or ancient habitates which have been preserved by natural processes.
2. Palaentologsits determine the age of fossils by using carbon dating method.
3. These fossils provide evidences of presence of extinct animals like dinosaurs and how the evolution occurred on the earth.

Question 5.
Write four daily life situations where changes in blood pressure is observed.
Answer:
Blood pressure changes when
a) we are afraid or excited
b) white climbing stairs
c) running
d) caused by exercises or stress, medication or rarely a medical condition.
e) blood pressure starts to rise a few hours before a person wakes up. Raising during the day, peaking in midday. Blood pressure is usually lower at night while sleeping.

Question 6.
Analyze the information given below.

Enzyme	Digestive gland	Digestive juice	Effect of enzymes on
Ptyalin	Salivary glands	Saliva	Carbohydrates
Pepsin	Gastric glands	Gastric juice	Proteins
–	Liver	Bile juice	Fats
Amylase	Pancreas	Pancreatic juice	Carbohydrates
Trypsin	Pancreas	Pancreatic juice	Proteins
Lipase	Pancreas	Pancreatic juice	Fats

Answer the following questions based on given table.
i) Name any two enzymes secreted by mixed gland.
Answer:
i) Amylase, Trypsin, Lipase.

ii) Which enzymes act on proteins?
Answer:
Pepsin, Trypsin.

iii) Name the process of fat digestion by the bile.
Answer:
Emulsification (breaking down of large fats into small globules.)

iv) Which digestive juice is without enzymes? Which gland it is produced from?
Answer:
Bile juice, secreted by liver.

Section – III (2 × 6 = 12 M)

Instructions :
i) This section contains 3 essay type of questions.
ii) Answer ANY TWO questions.
iii) Write the answer in 8 to 10 sentences.
iv) Each question carries 6 marks.

Question 7.
Explain the human respiratory system with a neat labelled diagram.
Answer:

Nostrils → Nasal cavity → Pharynx → Larynx → Trachea → Bronchus → Bron-chioles → Alveolus (lungs) → Blood.

Nostrils : Air usually enters the body through the nostrils.

Nasal cavity: Air is filtered. The moist surface of the lining of the nasal cavity and the hairs growing from its sides, remove some of the tiny particles of dirt in the air. In addition, as the inhaled air passes through the nasal cavity, its temperature is brought close to that of the body and it takes up water vapour so that it becomes more moist than before.

Pharynx : Warming and moistening goes on in this common passage of digestive and respiratory system. Epiglottis, a flap like muscular valve controls movement of food and air towards their respective passages.

Larynx : This stiff box contains vocal cards. When air passes out of the lungs and over the vocal cords, it causes them to vibrate. This produces sounds on the basis of our speech, song etc.

Trachea : Wind pipe channeling air to lungs.

Bronchus : At its lower end the trachea or the wind pipe divides into two bronchi-one leading to each lung.

Bronchioles : Each bronchi is further divide into smaller and smaller branches called bronchioles.

Alveolus : These finally terminate in clusters of air sacs called alveoli in the lungs. Gaseous exchange takes place here as blood capillaries take up oxygen and expel carbon dioxide.

Blood : Blood-carries oxygen, to each and every cell of the body and collects CO₂ from them.

Question 8.
Explain the stages in the formation of urine and write the composition of urine.
Answer:
Mechanism of urine formation:
Formation of urine involves 4 stages. They are
a) Glomenilar filtration .
h) Tubular re-absorption
c) Tubu1.r secretion and
d) Formation of concentrated urine

1. Glomerular filtration: The blood from renal artery flows into affrent arteriole of glomerulus. This blood is filtered under high pressure. As a result waste materials along with some water and useful substances like glucose, amino acids, proteins, salts are filtered out. They enter into the Bowman’s capsule. This is called glomerular filtration. This filtrate is called Primary urine.

2. Tubular reabsorption : Primary urine which is in glomerulus is almost equal to blood in chemical composition except the presence of blood cells. Peritubular capillaries present around the Henle’s loop reasbosrb essential substances and excess water present in the primary urine.

3. Tubular secretion: After absorption of eesential substances and water, urine travels through the loop of Henle, waste materials left unfiltered in the blood during glomerular filtration are secreted into the loop of Henle.

4. Formation of Concentrated Urine : Urine that reaches into the collecting tubule from the loop of Henle is further concentrated in the presence of hormone vasopressin. Deficiency of vasopressin causes excessive dilute urination. This condition is called “diabetes insipidus”.

5. Composition of urine : Urine contains 96% of water, 2.5 % of organic substances (urea, uric acid, creatinine, water soluble vitamins, hormones and oxalates etc., and 1.5 % of inorganic solutes (sodium, chloride, phosphate, sulphate, magnesium, calcium, iodine etc). It is acidic (pH = 6.0) in the beginning but becomes alkaline on standing due to break down of urea t o form ammonia.

Question 9.
Write the materials required, procedure and observations for preparation of a temporary slide of Rhizopus.
Answer:
Aim : To grow and examine rhizopus or common mold.
Materials required : Bread, plastic bag, plain glass slide, cover slip, water, eye dropper, disposable gloves, compound microscope.
Procedure to grow mold:

1. Take a soft bread and leave it in the open for about an hour so it is exposed to contaminants in the air.
2. Place the bread in a plastic bag, sprinkle water over it, so it is damp and seal the bag leaving some air inside.
3. Check the piece of bread regularly for every few days and add some water if it is becoming dried out.
4. We can find whitish thread like growth with masses of black, grey and green fine dotted structures, the black dotted structure is that of bread mold.
5. A good sample of mold may take up to two weeks to form.
6. Using this mold make a slide and observe under the microscope.

A) Material requried : Mold sample, plain glass slide, cover slip, water, disposable gloves.
B) Procedure:

1. Place a drop of water in the centre ofihe slide, using an eye dropper if you have one, or the tip of a clean finger.
2. Using a tooth pick, scrape some of the mold off, and place it on the drop of water.
3. Take the coverslip and set it at an angle to the slide so that one eduge of it touches the water drop. Then carefully lower it over the drop so that the coverslip covers the speci ment without trapping air bubbles underneath.
4. Use the corner of a tissue paper or blotting paper to blot up any excess water at the edges of the coverslip.
5. View the slide with a compound microscope, starting with a low objective.

1) The common bread mold plant consts of fine thread like projections called hyphae and thin stems having knob like structures called sporangia.
2) Each sporangium contains hundreds of minute spores.

Precautions:

1. This should not be done by those with allergies to mould or with severe asthma.
2. Avoid opening the plastic bag as much as you can.
3. If you touch the bread, be sure to thoroughly wash your hands afterwards.

Part – B

Time: 15 Minutes
Marks: 10

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

Question 1.
Arrange the following stages of Mitosis in sequential order. (  )
i) Anaphase
ii) Prophase
iii) Telophase
iv) Metaphase

A) ii, iv, i, iii
B) ii, iv/iii, i
C) ii, iii, i, iv
D) ii, i, iv, iii
Answer:
A) ii, iv, i, iii

Question 2.
Which chemical is used to boil the leaf in a test tube in an experiment conducted to test the presence of starch in leaves? (  )
A) Iodine
B) Methylated spirit
C) Potassium hydroxide
D) Paraffin solution
Answer:
B) Methylated spirit

Question 3.
Identify the INCORRECT pair from the following. (  )
A) Tannins – Acacia
B) Latex – Cassia
C) Resins Pinus
D) Alkaloids – Cinchona
Answer:
B) Latex – Cassia

Question 4.
Identify the CORRECT pair from the following. (  )
A) Producers – Insects
B) Herbivores Fox
C) Carnivores – Rabbit
D) Decomposers – Bacteria
Answer:
D) Decomposers – Bacteria

Question 5.
Identify the INCORRECT sentence from the following. (  )
A) Water is a renewable resource.
B) Coal and petrol are fossil fules.
C) Micro irrigation techniques result in high wastage of water.
D) Environmental conservation can be done by recycling of resources.
Answer:
C) Micro irrigation techniques result in high wastage of water.

Question 6.
The part of the brain which controls hunger pangs is (  )
A) Cerebrum
B) Diencephalon
C) Cerebellum
D) Medulla oblongata
Answer:
B) Diencephalon

Question 7.
Choose the correct word in place of symbol’?’ to complete the following equation. (  )

A) Thrombokinase
B) Prothrombin
C) Fibrin
D) Heparin
Answer:
C) Fibrin

Question 8.
Match the following and identify the correct option.
i) Charles Darwin
ii) Lamarck
iii) Mendel
iv) Charles Lyell

a) Inheritance of acquired characters
b) Origin of Species
c) Principles of Geology
d) Law of dominance

A) i – d, ii – a, iii – c, iv – b
B) i – b, ii – a, iii – d, iv – c
C) i – b, ii – c, iii – d, iv – a
D) i – b, ii – c, iii – a, iv – d
Answer:
B) i – b, ii – a, iii – d, iv – c

Question 9.
Identify the CORRECT sentence from the following. (  )
A) Cytokinins causes closing of stomata.
B) Testes produces estrogen hormone.
C) Humans have 31 pairs of cranial nerves.
D) Hind brain consists of cerebellum and medulla oblongata.
Answer:
D) Hind brain consists of cerebellum and medulla oblongata.

Question 10.
Identify the X, Y, labelled parts in the following figure. (  )

A) X – Pistil, Y – Sepals
B) X – Stamen, Y – Carpel
C) X – Stigma, Y – Ovary
D) X – Thalamus, Y – Stamen
Answer:
B) X – Stamen, Y – Carpel