Tuesday, November 10, 2020

Plant Kingdom | Class 11 | Previous Years Questions and Answers (2015 to 2020)

 PLANT KINGDOM


2020 MARCH


1.  Match the items of column A with B.


(A)

(B)

a)   Double fertilisation

   i.    Bryophyte

b)   Heterospory

  ii.    Algae

c)   Protonema

 iii.    Gymnosperm

d)   Naked seeds

 iv.    Pteridophyte

 

  v.    Angiosperm

✔️Answer:

(A)

(B)

a)  Double fertilisation

v.  Angiosperm

b)  Heterospory

iv. Pteridophyte/ Gymnosperm/ Angiosperm

c)  Protonema

i.   Bryophyte

d)  Naked seeds

iii. Gymnosperm


2019 JULY IMPROVEMENT


1.  Match the columns A and B.


A

B

    i.   Prothallus

   ii.   Sporophylls

  iii.   Coralloid roots

  iv.   Protonema

a)     Mosses

b)     Plant body of algae

c)     Gametophyte of Pteridophytes

d)     Sporangia bearing leaves

e)     Nitrogen fixation

✔️Answer:


A

B

    i.   Prothallus

   ii.   Sporophylls

  iii.   Coralloid roots

  iv.   Protonema

c)     Gametophyte of Pteridophytes

d)     Sporangia bearing leaves

e)     Nitrogen fixation

a)     Mosses


2019 MARCH


1.  Observe the figure given below. It shows two phases in the life cycle of a plant.



Identify the phase marked as A. Write any two peculiarities of this stage.


✔️Answer:


A= Sporophyte.

Peculiarities: Diploid (2n) structure. Produces haploid (n) spores.


2018 JULY IMPROVEMENT


1.     Match the items of column A with column B.


Column A

Column B

a.   Prothallus

  i.    Asexual buds in liverwort

b.   Protonema

 ii.    Sporophyte of angiosperms

c.   Antheridium

 iii.  Thalloid gametophyte of pteridophyte

d.   Gemmae

iv.    Male sex organs in bryophytes

 

 v.    Gametophytic stage of mosses


✔️Answer:

Column A

Column B

a.   Prothallus

iii. Thalloid gametophyte of pteridophyte

b.   Protonema

v. Gametophytic stage of mosses

c.   Antheridium

iv. Male sex organs in bryophytes

d.   Gemmae

i. Asexual buds in liverwort

 

2018 MARCH


1.   The given figure shows a plant belonging to liverworts. Identify the plant. Name the asexual buds seen on it and write their features.


✔️Answer:

Plant: Marchantia.

Asexual bud: Gemma

Features: Gemma are green, multicellular, asexual/ vegetative buds which develop in small                    receptacles.

2017 JULY (IMPROVEMENT)

1.   Distinguish between protonema and prothallus. (2)

✔️Answer:

Protonema: The first stage of mosses which develops directly from a spore.

Prothallus: The thalloid multicellular free-living gametophytes formed by the germination of the spores in pteridophytes.


2017 MARCH


1.   Algae are useful to man in a variety of ways. Suggest any four uses of algae. (2)

✔️Answer:


-  Many marine algae such as Sargassum are used as food.

Gelidium & Gracilaria produce Agar.

-  Some marine brown & red algae produce hydrocolloids (water holding substances).

Chlorella & Spirulina are used as food supplements by space travelers.


2016 MARCH

1.   Write any two distinguishing features of the algal class Rhodophyceae. (2)

✔️Answer:


- They have a red pigment, r-phycoerythrin.
- The food is stored as floridean starch.

2.   Distinguish between mycorrhiza and coralloid roots. (2)

✔️Answer:


- Mycorrhiza: It is the fungal association with roots of some gymnosperms such as Pinus.
- Coralloid roots: Small specialized roots in plants like Cycas that are associated with N2- fixing cyanobacteria.

2015 SEPTEMBER (IMPROVEMENT)

1.  ‘Amphibians of plant kingdom’ is used to denote a specific group in plant kingdom. Name the plant group and list any three vegetative or reproductive characters of that plant group. (2)


✔️Answer:


Plant group: Bryophytes.

Characters:

- They lack true roots, stem or leaves.
- The main plant body is haploid. It produces gametes.
- The male sex organ is antheridium and female sex organ is archegonium.

2015 MARCH


1.   Complete the given table of algal divisions and their main characteristics by filling 'a', 'b', 'c' ‘and ‘d’. (2)


Chlorophyceae

Chlorophyll-a, b

……..a……..

Phaeophyceae

Chlorophyll-a, c and ….. b……..

Laminarin mannitol

……. c …….

Chlorophyll-a, d & Phycoerythrin

……. d …….

 

✔️Answer:


a) Starch
b) Fucoxanthin
c) Rhodophyceae
d) Floridean starch.


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