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SEBA Class 7 Science Part II Chapter 4 Answer 2026 | Life Processes in Animals | Class 7 Science Part II Chapter 4 Books Solution

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SEBA Class 7 Science Part II Chapter 4 Answer 2026 | Life Processes in Animals | Class 7 Science Part II Chapter 4 Books Solution

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CHAPTER 10

Life Processes in Animals

<h6 class="wp-block-heading">EXERCISE</h6>

<h6 class="wp-block-heading">Q. 1. Trace the path of air through the respiratory system by filling the boxes with the correct parts.</h6>

<h6 class="wp-block-heading">Q. 2. Rita added iodine solution to three test tubes A, B, and C containing wheat flour, sugar, and boiled potato respectively. What results will she get in each case? Give reasons.</h6>

Ans.&nbsp;When iodine solution is added, the wheat flour in test tube A and the boiled potato in test tube C will change into a blue-black colour. This happens because both wheat flour and potato contain starch, and iodine gives a blue-black colour in the presence of starch. On the other hand, no colour change will be seen in test tube B containing sugar, as sugar does not contain starch and does not react with iodine.

<h6 class="wp-block-heading">Q. 3. Darken the circle of correct answer:</h6>

(i) What is the primary role of the large intestine?

(a) Absorption of nutrients (b) Absorption of water and salts (c) Digestion of proteins (d) Production of enzymes

Ans.&nbsp;(b)

(ii) What is the function of alveoli in the lungs?

(a) To pump air into the lungs (b) To filter dust from inhaled air (c) To exchange oxygen and carbon dioxide (d) To store carbon dioxide

Ans.&nbsp;(c)

(iii) Which gas do we inhale during respiration?

(a) Carbon dioxide (b) Nitrogen (c) Oxygen (d) Hydrogen

Ans.&nbsp;(c)

(iv) Which muscle helps in breathing?

(a) Diaphragm (b) Heart (c) Rib cage (d) Stomach

Ans.&nbsp;(a)

<h6 class="wp-block-heading">Q. 4. Fill up the blanks</h6>

(a)&nbsp;The first part of alimentary canal where digestion begins is the _________.

Ans.&nbsp;mouth

(b)&nbsp;The food pipe that connects the mouth to the stomach is called the _________.

Ans.&nbsp;oesophagus

(c)&nbsp;The _________ stores and churns food while mixing it with digestive juices _________.

Ans.&nbsp;stomach

<h6 class="wp-block-heading">Q. 5. Match the following</h6>

Column A

(i) Oxygen (ii) Carbon dioxide (iii) Alveoli (iv) Diaphragm (v) Breathing

Column B

(a) Waste gas exhaled from the body (b) Site of gaseous exchange in lungs (c) Helps in breathing by contracting and relaxing (d) Process of taking in oxygen and giving out carbon dioxide (e) Gas required for respiration

Ans.&nbsp;(i) - (e), (ii) - (a), (iii) - (b), (iv) - (c), (v) - (d)

<h3 class="wp-block-heading">Q. 6.</h3>

Ananya says to her classmate Madhurjya that all animals breathe through lungs. What question(s) can her friend Madhurjya ask to make her understand that some animals use gills or skin for breathing?

Ans.&nbsp;Madhurjya can ask Ananya the following questions to help her understand that some animals breathe through gills or skin—

(i)&nbsp;In what way do fishes and tadpoles breathe inside water?

(ii)&nbsp;How do grown-up frogs breathe while staying in water?

(iii)&nbsp;By which organ do earthworms breathe?

<h3 class="wp-block-heading">Q. 7.</h3>

Read the following statements and state whether they are correct or not. Support your answer.

Statements:

(a)&nbsp;Chewing food is not necessary for proper digestion.

(b)&nbsp;The small intestine is the main site for absorption of nutrients.

Ans.

(a)&nbsp;Not correct. Because chewing helps in breaking down food into small pieces which fecilitates better digestion.

(b)&nbsp;Correct. Because, internally the small intestine has a thin lining with thousands of finger-like projections that increase the surface area, for efficient nutrient absorption.

<h3 class="wp-block-heading">Q. 8.</h3>

We often cough when we inhale smoke from fire. What can be the possible explanation for this?

Ans.&nbsp;When we breathe in smoke from fire, the tiny particles and harmful gases present in the smoke irritate the inner lining of our respiratory tract. As a result, our body reacts by coughing to remove those irritating substances from the air passage.

<h3 class="wp-block-heading">Q. 9.</h3>

Sita sets up an experiment to check the action of saliva on carbohydrates. She added rice flour and water to two test tubes, M and N. She added saliva to test tube N and left both for 35 minutes. After adding iodine to both test tube solution, she observed the colour change. What do you think Sita wanted to test?

Ans.&nbsp;Sita wanted to test whether saliva helps in breaking down starch into sugar.

<h3 class="wp-block-heading">Q. 10.</h3>

A student filled two test tubes with lime water. He blew air from his lungs into one tube and allowed the other to remain with just room air passing through. After some time, he saw a difference. What concept is being tested and how can he be sure of his conclusion?

Ans.&nbsp;The experiment tests the idea that the air exhaled from our lungs contains more carbon dioxide than the normal air around us.

The student can confirm this by noticing that the lime water in the test tube through which exhaled air was passed turned milky, while the lime water in the other test tube, through which ordinary room air passed, showed little or no change. This happens because carbon dioxide reacts with lime water and makes it milky.

OLD Question Answer

Plant breeding

Exercises&nbsp;

1) Fill in the blanks&nbsp;

a) The formation of new plant parts after plant parts is called ________.&nbsp;

Ans:&nbsp;Angaja Vansh Bista

b) If this flower is a male or female reproductive organ, then the other flower is _______.&nbsp;

Answer:&nbsp;Ekling Full Bole.

c) When the pollen is transferred from the flower to the stamen or the ovary of the flower, it is known as _________ bully.&nbsp;

Answer:&nbsp;Pollination can be done.

d) Male and female gonads are called _________.&nbsp;

Answer:&nbsp;Nishechan Bole.

e) Seed dispersal takes place through ________, ________ and _________.&nbsp;

Answer:&nbsp;Air, water and animal sources.

2) Describe various methods of asexual reproduction with examples.&nbsp;

Answer:&nbsp;&nbsp; The methods of asexual reproduction are--

New plants can be propagated by asexually reproduced seeds or sperm. Then this method is-

Angaja genus details:&nbsp;Yat plant borer, stems, leaves and buds are formed. Because this genus grows after the plant's organs, Yak Angaj Vamsa Bista is called Buli Koa. For example - rose or champa flower stalks are cut into knots. This short branch is the branch pen. We see this branch grafting on the ground, the leaves are spreading out and the stem is shedding leaves, and it is seen that it has turned into a full flower.

Mukulan or Mukulodgam:&nbsp;A small microorganism is formed. If enough nutrients are given, the growth and division of this borer can be stopped in about an hour. It is the part of the bud that is part of the body. Gradually, the buds grow and after the stem cells are separated, new stem cells are formed. In the past, buds after buds are created forming a chain of buds. For example--Etukura pitha alap paneet thai yat ist guri alap mihlai tat echamuch cheni di lai diya. After one hour, if you observe the glass slide Julia material under a microscope, you will see that bud growth or bud chain is formed.&nbsp;&nbsp;

Fission:&nbsp;The process of asexual reproduction is fission. For example - welding is an electrical object. When water and nutrients are available in sufficient quantity, the shale borer grows and the number of these larvae increases by division. Any such thread may be divided into two or more pieces.&nbsp; &nbsp;

.Structure of&nbsp;nucleus: nucleus is the asexual reproductive organ. Each molecule is protected from adverse conditions such as high temperature and low humidity and is now covered by a hard protective coating. Under favorable conditions, these cells germinate and after each cell a new vegetative plant develops. Fish and angiosperms are examples of terrestrial plants.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;

3) What do you mean by sexual reproduction?&nbsp;

Answer:&nbsp;Flowers are the reproductive organs of plants. The formation of flowers in the reproduction of flowering plants. Stamens are the pollinating organs of flowers and stamens&nbsp;&nbsp;are&nbsp;&nbsp;the female reproductive organs. The fusion of sexually reproducible reproductive cells and female reproductive cells forms the zygote. This mating process is called pregnancy or fertilisation. After the pollen grains, the reproductive cells fuse with the female reproductive cells inside the ovule. Paragadhani Para Paragrenu Ahi Garbhamundat Thitapi Loa Paragyoga Bole. Pollen is transferred to the uterus by various means. These mediums are animals, water, various types of moths, animals etc. As a result of flowers being colorful and fragrant, insects and moths are attracted to the flowers and pollinators are taken from the body of the plant. Similar to other types of flowers, the pollen grains are collected after flowering. This is what happened. Self-pollination occurs if the pollen grains of each flower are fertilized. The pollination of each plant is done by the anther of the plant or the anther of the plant. The pollen grains germinate behind the stigma and form the anthers. The paragonal lid penetrates the cervix and touches the ovum in the uterine cavity. Fertilizer cells from the fertilized egg attach to the female reproductive cells from the ovule to complete fertilization or fertilization. After pregnancy, the uterus becomes swollen.

4) Describe the major differences between asexual and sexual reproduction.

Answer:&nbsp;The major differences between asexual reproduction and sexual reproduction are:

1) In asexually reproduced plants, seeds do not produce new plants.

2) In sexually reproducing plants, new plants are produced after seeding.

5) Draw the picture of the reproductive parts of this flower.&nbsp;

Answer:&nbsp;Draw the reproductive parts of the flower yourself.&nbsp;

6) Write the difference between self-pollination and cross-pollination?

Ans:&nbsp;If the pollinia is placed in the ovary of each flower, then self-pollination occurs.&nbsp;

&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp; Anhate jatia epah flower pollinator ekjupa plant ain epah flower after the ovary or an edal ak plant flower after the ovary tetiya tak other pollination bol.

7) Write why the fertilization process of flowers occurs?

Answer:&nbsp;&nbsp;FOR STUDENTS&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;

8) Describe the different methods of seed propagation.&nbsp;

Answer:&nbsp;1) Ghar Patal Bije or Akar (Madar) Shungal Seed and Chuli-like name, sun-facing fruits can be spread in many places and some seeds are spread in the same place.&nbsp;

2) Some seeds are carried by water. Generally, jonbo trees are on the banks of rivers, after teneboe trees, the fruit seeds fall into the river. And in the river, they came up and the seeds were spread.

3) Some seeds are carried by animals. Especially in the Hakota area, the seeds are stuck in the animal's body and the animal is very thin. For example Agra, and Urena.&nbsp;

4) Some of the fruits are suddenly&nbsp;cracked&nbsp;&nbsp;by the acorns and some of the seeds are spread. These seeds are lightly irrigated after sowing the root crop. For example, they occur in Guti and Demdeuka fields.

9) Pillar No.&nbsp; 2&nbsp;is connected&nbsp;to Pillar&nbsp; No. 1&nbsp;

&nbsp;Pillar No. 1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;Pillar No.&nbsp;2

&nbsp;a) Bud&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;i) Maple&nbsp;

&nbsp;b) Knife&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; i&nbsp;) Spiral welding&nbsp;

c) Division&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; i&nbsp;i&nbsp;i) East

d) Birds iv) Sheep to be domesticated&nbsp;

e) Renu vi) Rose&nbsp;

10) Mark correct answer ( &#x2714;).&nbsp;

a) The reproductive organs of Azalea plant are-

&nbsp;i) Leaf&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; i&nbsp;i) Stem&nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; i&nbsp;i&nbsp;i) Petal iv) Flower&nbsp;

Answer:&nbsp;Flowers.&nbsp;

b) Can male and female genitals meet?

i) Fertilization&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; i&nbsp;) Pollination&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;i&nbsp;i&nbsp;) Reproduction iv) Formation of seeds&nbsp;&nbsp;&nbsp;

Answer:&nbsp;Nichechan.&nbsp;

c) Puratha forms in the ovary&nbsp;

&nbsp;i) Seed&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; i&nbsp;i) Stamen&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; i&nbsp;i&nbsp;i) Sternum&nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;iv) Fruit&nbsp;

Answer:&nbsp;Seeds.

(d) are host plants&nbsp;

i) rose&nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; i&nbsp;i&nbsp;) bread crumbs iii) potato iv) ginger

&nbsp;Answer:&nbsp;Rose.

(e) The reproductive organ of a plant is--&nbsp;

i) Stem&nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; i&nbsp;i) Leaf&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;i&nbsp;i&nbsp;i) Petal iv) Flower&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;

Answer:&nbsp;&nbsp;Leaf.&nbsp;

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