Download NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms in PDF format. Download NCERT Solutions for class 9 all subjects free. If you need all chapters at one place, please follow the link for Class 9 Science Solutions.
NCERT Solutions for Class 9 Science Chapter 7
Class 9 Science – Biology – Diversity in Living Organisms
Extra questions with answers for Exams
- Question 1:
How do gymnosperm and angiosperms differ from each other?
- Answer 1:
Gymnosperm have naked seeds whereas Angiosperms have seed inside their fruits.
- Question 2:
What is the primary characteristics on which the first division of organism is made?
- Answer 2:
Whether the organism is prokaryotic or eukaryotic is the primary characteristic.
- Question 3:
On what basis are plants and animals put into different categories?
- Answer 3:
(1) Plants and animals are classified on the basis of mode of nutrition and body designs.
(2) Plants are autotrophs whereas animals are heterotrophs.
(3) Plants have cell wall whereas animals do not have cell wall.
- Question 4:
Why is there a need to classify living organisms?
- Answer 4:
(i) It enables us to study living things more easily and understand them better.
(ii) It helps to identify and communicate about the large number of living organisms on earth.
(iii) It helps to trace the possible origins of different living organisms to determine any relationship.
- Question 5:
What are phanerogams? Name its two groups along with criteria of division.
- Answer 5:
(i) Phanerogams are higher plants that bear flower and seeds.
(ii) Seeds are the result of reproductive process.
(iii) They contain an embryo which store food.
(iv) They are further divided into Gymnosperms and Angiosperms.
(v) Angiosperm have seeds inside the fruits.
- Question 6:
Differentiate between Monera and Fungi on the following grounds:
(a) Body organisation (b) Prokaryotic/Eukaryotic (c) Cell wall (d) Mode of nutrition
Name an organisms belongings to each of these kingdom.
- Answer 6:
(a) Unicellular undefined nucleus.
(c) Some have cell wall made up of cellulose.
(d) Autotrophic nutrition
Example: Blue green algae, bacteria.
(a) Multicellular at later stage organised body.
(c) All have cell wall made up of chitin.
(d) Heterotrophic nutrition.
Example: Yeast, Mashroom
- Question 7:
State the characteristic feature of thallophytes? Name two thallophytes which are predominantly aquatic?
- Answer 7:
Thallophytes body is not well differentiated, no vascular tissue present, usually contain green pigment and have cell wall made up of cellulose. Spirogyra, Ulva are thallophytes and are aquatic.
- Question 8:
Who proposed the system of binomial nomenclature for the organisms?
- Answer 8:
Carolus Linnaeus proposed the system of binomial nomenclature.
- Question 9:
Write three characteristics each of the following groups of animals:
(a) Platyhelmintes (b) Nematoda
- Answer 9:
(i) Their body is bilaterally symmetrical.
(ii) They are triploblastic
(iii) There is no coelom.
(i) Their body is cylindrical and bilaterally symmetrical.
(ii) Pseudocoelom is present.
(iii) They are triploblastic.
- Question 10:
Define the given terms and give one example of each:
(a) Bilateral symmetry (b) Coelom (c) Triploblastic
- Answer 10:
(a) Bilateral symmetry: The organisms which can be divided into two identical equal halves, i.e., like mirror images are said to possess bilateral symmetry.
(b) Coelom: It is the body cavity of the organisms. It is necessary for proper functioning of the body, e.g. heart has coelom which helps it to contract and expand.
(c) Triploblastic: These are the organisms derived from three embryonic germ layers.
- Question 11:
List any three differences between Aves and Mammalia group.
- Answer 11:
(a)They lay eggs.
(b) Do not have mammary glands.
(c) Their body is covered with feathers.
(a) They give birth to young ones.
(b) They have mammary glands.
(c) Their body is covered with hairs.
- Question 12:
What is the scientific name for humans?
(a) To which class of vertebrate does it belongs.
(b) Write five characteristics features of this group. Also mention the exceptions, if any.
- Answer 12:
(a) Human beings belongs to mammals.
(b) (i) They are warm blooded.
(ii) They have four chambered heart.
(iii) They have mammary glands for the production of milk to nurture their off springs.
(iv) Their skin have hair and sweat glands.
(v) They gave birth to young ones.
Exceptions: Platypus and Echidina lays eggs.