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Ncert Solutions for Class 11 Biology Chapter 7 | Download Free PDF

 NCERT Solutions for Class 11 Biology Chapter 7 in English

Adda 247 provides NCERT Solutions for Class 11 Biology chapter 7 which is for the students who want to go ahead in life and achieve great marks in their examinations. The NCERT Solutions for Class 11 Biology chapter 7 are provided by the teachers who are experts in their subjects. The solutions are set according to the rules formulated by the NCERT and in the language that can be understood by every student. By these reading, the solutions students can build up a strong base easily. The NCERT class 11 Biology solutions cover chapters 1 to 22 with the important questions and the answers in a detailed way.

Examinations can be threatening for some people, a proper learning of the concepts is the key to crack the examination. Students rely on the solutions of the NCERT provided by Adda 247. The solutions are formulated by the experts of the subjects who have tremendous knowledge in their subjects.

These NCERT Solutions help the students to get familiarized with the textbooks. The students can access the solutions anywhere while browsing the web easily. The solutions are very precise and accurate.

 

NCERT Solutions Class 11 Biology Chapter 7 – Structural organization in Animals

The chapter provides information about Structural organization in animals. Body of an animal is formed of several kinds of cells. There are about 200 different types of specialized cells in the human body. The cells of one or more kinds are arranged together in a characteristic manner and cooperate to perform a specific role. Such a group of cells is called a tissue. The cell of a tissue may secrete between them a non-living intercellular material. Thus, a tissue may be defined as a group of one or more types of cells having a similar origin and specialized for a specific function or functions along with the intercellular material.

 



Download Full PDF of Class 11 Biology Chapter 17

Features of the NCERT Solutions for Class 11 Biology Chapter 7- Structural organization in Animals

NCERT Solutions have been answered based on the important information on the question.

  • The columns are used wherever necessary.
  • Solutions are solved point wise and accurately answered point to point.

Important Questions Ncert Solutions for Class11 Biology Chapter 7- Structural organization in animals

Question 1. Answer in one word or one line.
(i) Give the common name of Periplanata americana.
(ii) How many spermathecae are found in earthworm?
(iii) What is the position of ovaries in cockroach?
(iv) How many segments are present in the abdomen of cockroach? (v) Where do you find Malpighian tubules?

Answer: The common name of Periplanata americana is the American cockroach.
(ii) Four pairs of spermathecae are present in earthworms. They are located between sixth and the ninth segments. They help in receiving and storing the spermatozoa during copulation.
(iii) In a cockroach, the pair of ovaries is located between 12th and 13th abdominal segments.
(iv) In both sexes, the abdomen of a cockroach consists of ten segments.
(v) Malphigian tubules are main excretory organs of cockroaches. They form a part of the alimentary canal.

Question 2. Answer the following:
(i) What is the function of nephridia?
(ii) How many types of nephridia are found in earthworm based on their location?

Answer: Nephridia are segmentally arranged excretory organs present in earthworms. (ii) On the basis of their location, three types of nephridia are found in earthworms. They are: Septal nephridia: These are present on both sides of the inter-segmental septa behind the 15th segment. They open into the intestines. Integumentary nephridia: These lie attached to the body wall from the third segment to the last segment, which opens on the body surface. Pharyngeal nephridia: These are present as three paired tufts in fourth, fifth, and sixth segments.

Question 5. Distinguish between the following:
(a) Prostomium and peristomium
(b) Septal nephridium and pharyngeal nephridium

Answer:

Prostomium Peristomium
It is the dorsal lobe which is located on the ventral mouth. It is the first segment or earthworm having a ventral mouth.
It overhangs the mouth of an earthworm. It surrounds the opening of the mouth.

 

Septal nephridium Pharyngeal nephridium
It is present on both the sides of inter-segmental septa. They are present as three paired tufts in the fourth, fifth and sixth segments.
They open in the intestine. They are closed.

Question 6. What are the cellular components of blood?

Answer: It has four main components: plasma, red blood cells, white blood cells and platelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues, forming blood clots to prevent excess blood loss.

Question 7. What are the following and where do you find them in animal body.

(a) Chondriocytes
(b) Axons
(c) Ciliated epithelium

Answer:

(a) Chondrocytes – Chondrocytes are the only cells found in cartilage. They are present in spaces called

lacunae and they produce and maintain the matrix of cartilage. Bending ability of cartilage is due to

chondrocytes. Cartilage is present at tip of nose, pinna of ear, epiglottis etc.

(b) Axon – Axon is one of the processes of neuron, which is the structural and functional unit of

nervous system. The part of cyton – n’here axon arises is axon hillock and axon ends in group of

branches called terminal arborizations. It conducts impulses away from the cyton. Neurons (nerve cells)

are present in brain and spinal cord.

(c) Ciliated epithelium – If the columnar or cuboidal cells bear cilia on their free surface they are called

ciliated epithelium. Their function is to move particles or mucus in a specific direction over the

epithelium. They are mainly present in the inner surface of hollow organs like bronchioles and

Fallopian tube.

Question 8. Describe various types of epithelial tissues with the help of labelled diagrams

Answer:

(a) Simple epithelium: It is the single layer of cells which are in direct contact with the basement membrane. Simple epithelium is further subdivided into the following types:

(i) Simple squamous epithelium: It consists of a single layer of flat cells with irregular boundaries. Simple squamous epithelium is mostly found in the walls of the blood vessels and in the lining of alveoli.

(ii) Simple cuboidal epithelium: It consists of a single layer of cube-like cells and is present in regions where secretion and absorption of substances take place such as the proximal convoluted tubule region of the nephron.

iii) Simple columnar epithelium: This epithelium is formed by a single layer of tall, slender cells with their nuclei present at the base of the cells. These generally possess microvilli on the free surfaces. Columnar epithelium forms the lining of the stomach and intestines. The major function of simple columnar epithelium is secretion and absorption.

(iv) Ciliated epithelium: It consists of columnar or cuboidal cells with cilia on their free surfaces. They are present in bronchioles and oviducts from where they direct mucus and eggs in specific directions.

(v) Glandular epithelium: These are columnar or cuboidal cells involved in the secretion of substances. Glands are of two types, unicellular glands (goblet cells of the alimentary canal) and multicellular glands (salivary glands). They can be classified as exocrine (ductless glands) and endocrine glands (duct glands) based on the method through which they release enzymes.

(b) Compound epithelium: When the simple epithelium is consists of many layers of cells, it is called compound epithelium. The compound epithelium is involved mainly in the function of providing protection and has a limited role in secretion and absorption. Examples of compound epithelium include the dry surface of the skin or moist inner lining of the buccal cavity, pharynx, pancreatic ducts, and the inner lining of ducts of salivary glands.

(iii) Simple columnar epithelium: This epithelium is formed by a single layer of tall, slender cells with their nuclei present at the base of the cells. These generally possess microvilli on the free surfaces. Columnar epithelium forms the lining of the stomach and intestines. The major function of simple columnar epithelium is secretion and absorption.

(iv) Ciliated epithelium: It consists of columnar or cuboidal cells with cilia on their free surfaces. They are present in bronchioles and oviducts from where they direct mucus and eggs in specific directions.

(v) Glandular epithelium: These are columnar or cuboidal cells involved in the secretion of substances. Glands are of two types, unicellular glands (goblet cells of the alimentary canal) and multicellular glands (salivary glands). They can be classified as exocrine (ductless glands) and endocrine glands (duct glands) based on the method through which they release enzymes.

(b) Compound epithelium: When the simple epithelium is consists of many layers of cells, it is called compound epithelium. The compound epithelium is involved mainly in the function of providing protection and has a limited role in secretion and absorption. Examples of compound epithelium include the dry surface of the skin or moist inner lining of the buccal cavity, pharynx, pancreatic ducts, and the inner lining of ducts of salivary glands.

 

Question 9. Distinguish between
(a) Simple epithelium and compound epithelium
(b) Cardiac muscle and striated muscle
(c) Dense regular and dense irregular connective tissues (d) Adipose and blood tissue
(e) Simple gland and compound gland

Answer:

(a) Simple epithelium and compound epithelium

Simple epithelium Compound epithelium
It is composed of a single layer of cells. It consists of two or more cell layers.
It functions as a lining for body cavities, ducts and tubes. It is protective in function like our skin.

(b) Cardiac muscle and striated muscle

Cardiac muscle Striated muscle
It occurs only in the wall of the heart. It occurs in the body wall, limb, tongue, pharynx, etc.
They are short and cylindrical with truncate ends. They are long and cylindrical with blunt ends.
They have nerve supply from brain and autonomous nervous system. They have nerve supply from central nervous system.

(c) Dense regular and dense irregular connective tissues

Dense regular Dense irregular
Collagen fibres are present in rows between many parallel bundle of fibres. For example, tendons. Fibroblasts and many fibres are present that are oriented. For example, cartilage, bones and blood.

(d) Adipose and blood tissue

Adipose tissue Blood
It is present mainly beneath the skin. It flows within the blood vessels and has RBCs
It stores extra fat and excess nutrients. It helps in transport of various substances.

(e) Simple gland and compound gland

Simple gland Compound gland
The glands have single, unbranched duct. The glands have branched system to ducts.
These may be simple, tubular glands, simple coiled tubular glands and alveolar glands. These may be compound tubular glands, compound alveolar glands and compound tubuloalveolar glands.

Question 10. Mark the odd one in each series: (a) Areolar tissue; blood; neuron; tendon
(b) RBC; WBC; platelets; cartilage
(c) Exocrine; endocrine; salivary gland; ligament (d) Maxilla; mandible; labrum; antennae

(e) Protonema; mesothorax; metathorax; coxa

Answer:

Areolar tissue, blood, and tendons are examples of connective tissues. Neuron is an example of neural tissue.

(b) RBCs, WBCs, and platelets are the three most important components of blood. Cartilage is

therefore, the odd one out.

(c) Exocrine, endocrine, and salivary glands are examples of simple glandular epithelium. Ligament is a connective tissue.

(d) Maxilla, mandible, and labrum are mouthparts of a cockroach. Antennae, on the other hand, are

present in the head region of cockroaches.

(e) Protonema forms the developmental stage in the life cycle of a moss. Mesothorax, metathorax, and

coxa are parts or segments present in the legs of a cockroach.

Question 11. Match the terms in column I with those in column II: 

Column I Column II
(a) Compound epithelium (i) Alimentary canal
(b) Compound eye (ii) Cockroach
(c) Septal nephridia (iii) Skin
(d) Open circulatory system (iv) Mosaic vision
(e) Typhlosole (v) Earthworm
(f) Osteocytes (vi) Phallomere
(g) Genitalia (vii) Bone

 

Solution:

Column I Column II
(a) Compound epithelium (iii) Skin
(b) Compound eye (iv) Mosaic vision
(c) Septal nephridia (v) Earthworm
(d) Open circulatory system (ii) Cockroach
(e) Typhlosole (i) Alimentary canal
(f) Osteocytes (vii) Bone
(g) Genitalia (vi) Phallomere

 

Question 12. Mention briefly about the circulatory system of earthworm

Answer:  Earthworm exhibits a closed type of blood vascular system. This type of blood vascular

system consists of blood vessels, capillaries and heart. Due to closed circulatory system, blood is

confined to the heart and blood vessels. Contractions of the body keep blood circulating in one

direction. Smaller blood vessels supply the gut, nerve cord, and the body wall. Blood glands are present

on the4th, 5th and 6th segments. They produce blood cells and haemoglobin, which is dissolved in

blood plasma. Blood cells are phagocytic in nature. Earthworms lack specialised breathing devices.

Respiratory exchange occurs through the moist body surface directly into the blood stream.

 

FAQs on NCERT Solutions Class 11 Biology Chapter 7

 

What are the advantages of referring NCERT Solutions for class 11 Biology chapter 7?

Students referring the NCERT Solutions by Adda 247 find the solutions helpful during the exams. The solutions are prepared by the experts in an interactive manner keeping in mind the students. The students’ perspective is kept in mind while preparing the solutions. It helps in completing the syllabus on time and also provides notes for the revision prior to the exam.

 

What are the advantages of referring NCERT in competitive exams like JEE and AIPMT?

Most of the competitive exams like NEET, JEE etc. follow the basic NCERT books for designing their question papers. NCERT serves as the base for every book prepared for NEET and JEE. The competitive exams are based on the CBSE syllabus applied in XI and XII classes and NCERT books strictly follow CBSE syllabus. In addition to this, NCERT books play an important role in clearing out the theoretical concepts. Every topic given in NCERT books is explained in such a way to help students make their basics and fundamentals strong and clear.

 

How to read NCERT books more efficiently?

 

Given below are the important points which must be followed while reading the NCERT books in an efficient manner:

Go through each topic thoroughly by understanding the meaning and significance of each line mentioned in that particular topic.

Ask your teacher if any doubts.

Note down the important topics to revise at the time of examination.

Solve all the exercise questions given at the end of each chapter. These questions are important for understanding the concepts in a better way.

 

Is it mandatory to solve all the NCERT questions mentioned at the end of each chapter?

 

The questions and answers mentioned in NCERT textbooks at the end of each chapter are quite important not only for examination but also for understanding the concepts in a better way. These questions aim to test the students’ understanding and learning over the topics that they have learned in the chapter.

Solving the NCERT exercise problems will help to

  • clear all the concepts and formulae you learned in a chapter
  • get comfortable with different types of questions that might be asked in exams
  • get enough practice which is key to succeed in Mathematics exam
  • improve your accuracy and speed

 

What are the important concepts covered in the Chapter 7 of NCERT Solutions for Class 11 Biology?

 

The concepts involved are –

7.1 – Animal Tissue
7.2 – Organ and organ system
7.3 – Earthworm
7.4 – Cockroach
7.5 – Frogs

These concepts are created by the faculty at Adda 247. The solutions are available at Adda 247 in the PDF format which can be downloaded by the students.

 

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