Notes | EduRev

Science Class 9

Created by: Dr Manju Sen

Class 9 : Notes | EduRev

The document Notes | EduRev is a part of the Class 9 Course Science Class 9.
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SHORT ANSWER QUESTIONS

Q.1. What are Phanerogams? Name its two groups.    [CBSE 2017]
Ans.
Phanerogams are flowering plants whose reproductive organs are conspicuous. They bear flowers and seeds.
Its two groups are Monocots and Dicots.

Q.2. What are lichens?     [CBSE 2017]
Ans.
Lichens are a symbiotic association between a fungal and an algal partner where fungus provides water and mineral and alga provides nutrition.

Q.3. State a characteristic feature of thallophytes? Name two thallophytes which are predominantly aquatic.    [CBSE 2016]
Ans.
Characteristic features of thallophyta are:
(i) They do not have well-differentiated body design.
(ii) The plants in this group are commonly called algae.
(iii) These plants are predominantly aquatic.
Two thallophytes which are predominantly aquatic are Spirogyra and Cladophora.

Q.4. Disha saw a house lizard crawling on the wall and asked her mother who is a biology teacher.
(a) Is body temperature related to the surrounding temperature in reptiles? How can we define this feature of reptiles?
(b) What is their breathing organ?
(c) Is there any reptile with four chambered heart? Summarize her mother’s statement.    [CBSE 2016]
Ans.
(a) The body temperature of reptile is the same as the surrounding temperature. The feature in reptile is called cold blooded animal.
(b) The breathing organ of reptile is lung.
(c) Crocodile has four chambered heart.
Reptiles are cold-blooded animals and breathing of these take place through lungs. The lungs of reptiles are 3 chambered except crocodile which has a four-chambered heart.

Q.5. State a characteristic feature of thallophyta? Name two thallophyta which are predominantly aquatic.    [CBSE 2016]
Ans.
Characteristic features of thallophyta are:
(i) They don't have well-differentiated body design.
(ii) The plants in this group are commonly called algae.
(iii) These plants are predominantly aquatic.
Two thallophytes which are predominantly aquatic are Spirogyra and Cladophora.

Q.6. One day Disha who is studying in class IX went to mother dairy’s vegetable shop where she found some umbrella-like structure being sold. She could immediately identify them.    [CBSE 2015]
(a) What is that structure?
(b) To which kingdom does that belong?
(c) Write two characteristic features of organisms belonging to this kingdom.
Ans.
(a) Agaricus- Commonly known as mushroom.
(b) It belongs to kingdom fungi.
(c) (i) Fungi are eukaryotic non green organisms.
(ii) They are heterotrophic in naute.

Q.7. Where are seeds of gymnosperms formed?    [CBSE 2015]
Ans. 
Seeds of gymnosperms are naked.

Q.8. Give differences between monocotyledonous and dicotyledonous plants.    [CBSE 2015]
Ans. 

Monocotyledonous Dicotyledonous
(i) Monocot plants have seed with single cotyledon.Dicotyledon plant has seeds with two cotyledons.
(ii) The plants have parallel venation.The plants have reticulate venation.
(iii) The plant has fibrous root system.They have tap root system.

Long Answer Type Question

Q.1. Give examples of organisms belonging to kingdom protista.
(i) Based on structure for locomotion.
(ii) Based on mode of nutrition.     [CBSE 2017]
Ans.
(i) Locomotion is generally present. It occurs with the help of flagella (Euglena), cilia (Paramecium) and pseudopodia (Amoeba).
(ii) Their mode of nutrition can be autotrophic (unicellular algae like diatoms and dinoflagellates as well as Euglena like organisms) or heterotrophic (as in protozoans). Holozoic mode of nutrition is seen in Amoeba where solid food particle are ingested.

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