NCERT Solutions For Class 11 Biology Chapter 4 Animal Kingdom

NCERT Solutions For Class 11 Biology Chapter 4 Animal Kingdom

Class 11 Biology Chapter 4 Animal Kingdom

NCERT Solutions For Class 11 Biology Chapter 4 Animal Kingdom in this step-by-step answer guide. In some of State Boards and CBSE schools, students are taught thru NCERT books. As the chapter comes to an end, students are requested few questions in an exercising to evaluate their expertise of the chapter. Students regularly want guidance managing those NCERT Solutions.

It’s most effective natural to get stuck withinside the exercises while solving them so that you can assist students score higher marks, we’ve provided step by step NCERT answers for all exercises of Class eleven Biology so you can are looking for assist from them. Students should solve those exercises carefully as questions withinside the final exams are requested from those, so these exercises immediately have an impact on students’ final score. Find all NCERT Solutions for Class eleven Biology below and prepare in your tests easily.

NCERT Solutions For Class 11 Biology Chapter 4 Animal Kingdom

Class 11 Biology Chapter 4 Animal Kingdom

 

1. What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?

Solution

Animals are classified on the basis of common features such as cell arrangement, body symmetry, nature of coelom, digestive tract, circulation or reproductive system. Without these common features it is very difficult to treat each organism individually, it is impossible to add new species detected every day without common features. To study diversity in animals, classification must be based on common basic features

Some other difficulties are:

(i) Tracing of interdependence amongst various animals will become difficult

(ii) Difficulty in developing new species of animals

2. If you are given a specimen, what are the steps that you would follow to classify it?

Solution:

The steps to classify the specimen are:

(i) Classify level of organization: Classify the arrangement of cells in cellular and tissue level organization.

(ii) Symmetry: Classify the organism as radial or bilateral symmetry.

(iii) Classify Diploblastic or triploblastic organization

(iv) Presence or absence of body cavity

(v) Type of coelom development

(vi) Classify segmentation

(vii) Differentiate the presence or absence of notochord.

3. How useful is the study of the nature of body cavity and coelom in the classification of animals?

Solution:

The coelom is the body cavity or fluid filled space lined by the mesoderm, and an animal with a coelom is called a coelomates. In some animals, the body cavity is not covered by the mesoderm; Instead, the mesoderm is a scattered cyst between the ectoderm and the endoderm. Such a body cavity is called a pseudocoelom and the animals that have them are called pseudocoelomates, for example – Aschelminthes. Some animals have no body cavity, they are called acoelomates, for example – Platyhelminthes.

Classification of body cavity and coelom are important to decide the complexity of an organism at organ level.

4. Distinguish between intracellular and extracellular digestion?

Solution:

Intracellular digestion

Extracellular digestion

It occurs in lower organisms

Occurs in multicellular organisms

Occurs within cells

Occurs within cavity of the ailmentry canal, outside the cell

It is less efficient with no regional differentiation

Highly efficient with regional differentiation

Enzymes associated are very few

Large number of digestive glands and enzymes are required

 

5. What is the difference between direct and indirect development?

Solution:

Direct development

Indirect development

Occurs in fish, reptile birds and mammals

Occurs in in vertebrate amphibians

In direct development, the embryo develops into a well-grown individual without involving in a larval stage.

It involves a sexually immature larval stage

Metamorphosis is absent

Metamorphosis is present

Ex: Hydra, earthworm

Ex: Frog, butterfly

6. What are the peculiar features that you find in parasitic platyhelminthes?

Solution:

The typical features of the parasitic Platyhelminthes are:

(i) Free-living parasitic forms.

(ii) The body organization observed is of tissue organ grade

(iii) Mostly hermaphrodites

(iv) Three-layered body wall – epidermis (outer covering) is often ciliate and covered with cuticle.

(v) The Digestive tract is incomplete or absent

(vi) The presence of well-defined excretory structures, such as flame cells.

(vii) Presence of anti-toxins and a thick tegument which is resistant to the digestive enzymes of host. (viii) Anaerobic respiration. No special respiratory structure was observed.

(ix) The front body part has suckers, hooks, eye spots and auricles to attach to the hosts.

(x) A highly developed reproductive system of parasitic forms.

7. What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?

Solution:

The following are the causes of arthropods, which make up the largest group of animal kingdoms

(i) They have jointed legs that allow them to motile, and perform many other functions due to these jointed appendages.

(ii) A hardened skeleton made of chitin protects their body.

(iii) Hard skeletons reduce water loss from the body.

(iv) Demonstrate a different system for locomotion, respiration and reproduction.

(v) Ability to live in diverse conditions and varied habitats.

(vi) In comparison to other phyla, they are pre-developed.

(vii) Well-developed sense organs and nervous system.

(vii) Some insects exhibit pheromones that enable communication.

8. Water vascular system is the characteristic of which group of the following:

(a) Porifera (b) Ctenophora (c) Echinodermata (d) Chordata

Solution:

Form the four given options the correct answer is (c) Echinodermata

This is their characteristic. Among them is a perforated panel known as madreporite, which allows water to percolate in their systems.

9. “All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.

Solution

The presence of Notocard and paired pharyngeal gill slits is characteristic of the phylum chordate. However, the vertebrata notocard in the embryo in the subfilm is replaced by columns of bony vertebrae in adults. It is therefore said that “All vertebrates are chordates, but not all chordates are vertebrates.”

10. How important is the presence of air bladder in Pisces?

Solution:

Air bladder in Pisces regulates Buoyancy which prevents fishes from sinking.

11. What are the modifications that are observed in birds that help them fly?

Solution:

The variations found in birds that help fly are:

(i) The presence of feathers.

(ii) Forelimbs are turned into wings, to help with flight.

(iii) Hind limbs have scales.

(iv) They have pneumatic or hollow bones that lighten the skeleton

(v) Absence of urinary bladder causes net body weight loss and facilitates them to fly

(vi) Their streamlined body provides less resistance and enables longer flight

12. Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?

Solution:

No, the number of eggs or young ones produced by an oviparous and viviparous mother are not equal, the number of eggs produced by oviparous mothers is more comparatively because in oviparous animals, fertilization talks place outside the uterus whereas in viviparous animals’ development takes place inside the uterus which makes successful incubation of young animals lesser.

When eggs are present outside, there is a risk of getting eaten by predators due to their immobility. Therefore, in order to sustain the progeny, there is a requirement for more of eggs.

13. Segmentation in the body is first observed in which of the following:

(a) Platyhelminthes (b) Aschelminthes (c) Annelida (d) Arthropoda

Solution:

Form the four given options the correct answer is (c) Annelida

14. Match the following:

Column I

Column II

(a) Operculum

(i) Ctenophora

(b) Parapodia

(ii) Mollusca

(c) Scales

(iii) Porifera

(d) Comb plates

(iv) Reptilia

(e) Radula

(v) Annelida

(f ) Hairs

(vi) Cyclostomata and Chondrichthyes

(g) Choanocytes

(vii) Mammalia

(h) Gill slits

(viii) Osteichthyes

Solution:

Column I

Column II

(a) Operculum

(viii) Osteichthyes

(b) Parapodia

(v) Annelida

(c) Scales

(iv) Reptilia

(d) Comb plates

(i) Ctenophora

(e) Radula

(ii) Mollusca

(f ) Hairs

(vii) Mammalia

(g) Choanocytes

(iii) Porifera

(h) Gill slits

(vi) Cyclostomata and Chondrichthyes

15. Prepare a list of some animals that are found parasitic on human beings.

Solution:

Some animals that are found parasitic in humans are as follows:

i. Ancylostoma (Hookworm)

ii. Taenia (Tapeworm)

iii. Enterobius (Pinworm)

iv. Wuchereria (Filarial worm)

v. Ascaris (Roundworm)

Benefits of NCERT Solutions

NCERT’s Class 11 solution contains extremely important points, and for each chapter, each concept has been simplified to make it easier to remember and increase your chances of achieving excellent exam results. Exam Preparation References Here are some tips on how these solutions can help you prepare for the exam.

  1. This helps students solve many of the problems in each chapter and encourages them to make their concepts more meaningful.
  2. NCERT Solutions for Class 11 solutions encourage you to update your knowledge and refine your concepts so that you can get good results in the exam.
  3. These solutions are the best exam materials, allowing you to learn more about your week and your strengths. To get good results in the exam, it is important to overcome your weaknesses.
  4. Most of the questions in the exam are formulated in a similar way to NCERT textbooks. Therefore, students should review the solutions in each chapter in order to better understand the topic.
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Tips & Strategies for Class 11 Exam Preparation

  1. Plan your course and syllabus and make time for revision
  2. Please refer to the NCERT solution available on the cbsestudyguru website to clarify your concepts every time you prepare for the exam.
  3. Use the cbsestudyguru learning app to start learning to successfully pass the exam. Provide complete teaching materials, including resolved and unresolved tasks.
  4. It is important to clear all your doubts before the exam with your teachers or Alex (an Al study Bot). 
  5. When you read or study a chapter, write down algorithm formulas, theorems, etc., and review them quickly before the exam.
  6. Practice an ample number of question papers to make your concepts stronger. 
  7. Take rest and a proper meal.  Don’t stress too much. 

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