CLASS-7 Subject-Science Chapter-10 Respiration in animals and plants

 EVENTS CONVENT HIGH SCHOOL

16/11/2021      CLASS - 7   SESSION 2021-22
SUBJECT :  SCIENCE

CHAPTER-10 RESPIRATION IN ANIMALS AND PLANTS
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Q1. Why does an athlete breathe faster and deeper than usual after finishing the race?

Answer:
During the run, the demand of energy is high but the supply of oxygen to produce energy is limited. Therefore, anaerobic respiration takes places in the muscle cells to fulfill the demand of energy. After finishing the race, an athlete breathe faster and deeper than usual so that more oxygen is supplied to the cells.

Q2. List the similarities and differences between aerobic and anaerobic respiration.
Answer:
Similarity:
(i) In both aerobic and anaerobic respiration, food is broken down to release energy.
(ii) Both takes place inside cells.
(iii) Both produces byproducts.

Differences:

Aerobic Respiration	Anaerobic Respiration
(i) It takes place in the presence of oxygen.	(i) It takes place in the absence of oxygen.
(ii) Energy is released in higher amount.	(ii) Energy is released in lesser amount.
(iii) Carbon dioxide and water are produced as byproducts.	(iii) Carbon dioxide and water are produced as byproducts.
(iv) It is a slow process.	(iv) It is a fast process.
(v) Examples: Animals and plants cells.	(iv) Examples: Human cells, yeast, Bacteria etc.

Q3. Why do we often sneeze when we inhale a lot of dust-laden air?
Answer:
We often sneeze when we inhale a lot of dust-laden air to expel out these foreign particles. These particles get past the hair in the nasal cavity and irritate the lining of the cavity which results in sneezing.

Q4. Take three test-tubes. Fill each of them with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2 ?
Answer:
Test-tube A will have the highest concentration of CO2 because snail will take in oxygen and gives out CO2.
In test-tubes B and C, the CO2 will be utilized by the water plant for synthesizing food and hence there will be less concentration of CO2 in these.

Q5. Tick the correct answer:
(a) In cockroaches, air enters the body through
(i) lungs
(ii) gills
(iii) spiracles
(iv) skin
Answer: (iii) spiracles
(b) During heavy exercise, we get cramps in the legs due to the accumulation of
(i) carbon dioxide
(ii) lactic acid
(iii) alcohol
(iv) water
Answer: (ii) lactic acid
(c) Normal range of breathing rate per minute in an average adult person at rest is:
(i) 9 – 12
(ii) 15 – 18
(iii) 21 – 24
(iv) 30 – 33
Answer: (ii) 15 – 18
(d) During exhalation, the ribs
(i) move outwards
(ii) move downwards
(iii) move upwards
(iv) do not move at all
Answer: (ii) move downwards

Q6. Match the items in Column I with those in Column II:

Column I	Column II
(a) Yeast	(i) Earthworm
(b) Diaphragm	(ii) Gills
(c) Skin	(iii) Alcohol
(d) Leaves	(iv) Chest cavity
(e) Fish	(v) Stomata
(f) Frog	(vi) Lungs and skin
–	(vii) Tracheae

Answer:

Column I	Column II
(a) Yeast	(iii) Alcohol
(b) Diaphragm	(iv) Chest cavity
(c) Skin	(i) Earthworm
(d) Leaves	(v) Stomata
(e) Fish	(ii) Gills
(f) Frog	(vi) Lungs and skin

Q7. Mark T if the statement is true and F if it is false:
(i) During heavy exercise the breathing rate of a person slows down. (T/ F)
(ii) Plants carry out photosynthesis only during the day and respiration only at night. (T/ F)
(iii) Frogs breathe through their skins as well as their lungs. (T/ F)
(iv) The fishes have lungs for respiration. (T/ F)
(v) The size of the chest cavity increases during inhalation. (T/ F)
Answer:
(i) F
(ii) F
(iii) T
(iv) F
(v) T

CLASS-7 SUBJECT-SOCIAL SCIENCE (CIVIC) CHAPTER-7 MARKET AROUND US

  EVENTS CONVENT HIGH SCHOOL

11/11/2021      CLASS- 7   SESSION 2021-22
SUBJECT :  SOCIAL SCIENCE (CIVIC)

CHAPTER-7 mARKET AROUND US
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I. VERY SHORT ANSWER TYPE QUESTIONS:-

1. Why is a weekly market called so?
Answer: A weekly market is called so because it is held a specific day of the week.

2. Why is there a competition among the shops in the weekly market? [V. Imp.]
Answer: In the weekly market there are many shops that sell the same goods. This creates competition among them.

3. Who is Scunner? What does he do?
Answer: Sameer is a small trader in the weekly market. He buys clothes from a large trader and sells them in six different markets in a week.

4. Give some examples of roadside stalls.
Answer: Vegetable hawker, fruit vendor, mechanic.

5. How are shops in the neighbourhood useful?
Answer: These types of shops are close to our home and we can go there any time. As the buyer and seller know each other these shops also provide goods on credit.

6. Where are the goods produced?
Answer: Goods are produced in factories, on farms, and in homes.

7. Why do we not buy directly from the producer?    [V. Imp.]
Answer: It is because the producer is not interested in selling goods in small quantities. 9*

II. SHORT ANSWER TYPE QUESTIONS:-

1. Write in brief about shopping complexes and malls.
Answer: Shopping complexes and malls are usually found in urban areas. These are large multi-storeyed air-conditioned buildings with shops on different floors. These shops sell both branded and non-branded goods. Fewer people visit malls because they sell costly items. Only well-to-do people can afford to buy these items.

2. What is the job of a wholesale trader?  [V. Imp.]
Answer: A wholesale trader buys goods from the producer in large quantities. He then sells them to other traders, say small traders. These small traders sell different items to the final consumer. Thus, the wholesale trader establishes link between the producer and the consumer. It is through these links of traders that goods reach faraway places.

3. How are shop owners in a weekly market and those in a shopping complex very different people?  [V. Imp.]
Answer: Both are undoubtedly different people.
(a) The shop owners in a weekly market are small traders who run their shop with little money. On the other hand, the shop owners of a shopping complex are big parties. They have a lot of money to spend on their shops.

(b) What these two types of shop owners earn is also not equal. The weekly market trader earns little compared to the profit of a regular shop owner in a shopping complex.

4. Write a brief note on ‘Aftab—the wholesaler in the city’.
Answer: Aftab is a wholesaler of vegetables. His work usually starts at around 2 o’clock in the early morning. This is the time when vegetables reach the market or mandi and with them start the activities. The vegetables come in trucks, matadors, etc. and soon the process of auctions begins. Aftab participates in this auction and decides what he will buy. He buys vegetables in bulk. After that, he sells them to hawkers and shopkeepers who usually come to him around six in the morning.

Class-7 Subejct English Grammer (Letter & application) Slot-2

 EVENTS CONVENT HIGH SCHOOL

11/11/2021      CLASS- 7   SESSION 2021-22
SUBJECT :  ENGLISH GRAMMER

LETTER & APPLICATION
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Write a letter to your father requesting him to buy you a cycle.

70,Bagh Dilkusha Bhopal

11 November 2021

Dear Papa

You will be glad to know that I have secured 86 per cent marks in class VII. Let me remind you of your promise that if I score good marks, you will get me a bicycle. So, please do let me have a cycle in this summer vacation. It will save my precious time. I want to devote more and more time to my studies.

I look forward eagerly. I am very keen to have my very first bicycle.

Yours affectionately

You Name ______________

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Write an application to the Principal of your school to allow you to change your section.

The Principsil

Events Convent high school

Bhopal

11 November 2021

Madam

I am a new student of VII standard of your school. My father has recently been transferred to this place, I have been allotted section D. The students of this section are all good but I have some personal problem for which I want to get my section changed. 

Therefore,I request you to kindly consider my case and do the favour. 

I shall be grateful if you change my section from Section D to section A’.

Thanking you

Yours obediently

Your name ________

Roll No. 20

Class VII