Grade 11 : Biology - Plant Kingdom (Set 1)

Question 1

Which class of algae is commonly referred to as red algae due to the presence of the pigment r-phycoerythrin?

Accepted Answer

C) Rhodophyceae

Answer

A) Chlorophyceae

Answer

B) Phaeophyceae

Answer

D) Xanthophyceae

Question 2

What is the dominant, independent, and photosynthetic phase in the life cycle of a bryophyte?

Accepted Answer

A) Gametophyte

Answer

B) Sporophyte

Answer

C) Sporangium

Answer

D) Protonema

Question 3

Which pigment gives brown algae (Phaeophyceae) their characteristic olive-green to brown color?

Accepted Answer

B) Fucoxanthin

Answer

A) Chlorophyll b

Answer

C) r-Phycoerythrin

Answer

D) Anthocyanin

Question 4

Which moss provides peat that has long been used as fuel and packing material for trans-shipment of living material?

Accepted Answer

D) Sphagnum

Answer

A) Funaria

Answer

B) Polytrichum

Answer

C) Marchantia

Question 5

Pteridophytes are evolutionary significant because they are the first terrestrial plants to possess:

Accepted Answer

A) Vascular tissues (Xylem and Phloem)

Answer

B) Seeds

Answer

C) Flowers

Answer

D) Fruits

Question 6

Why are the seeds in gymnosperms described as naked?

Accepted Answer

B) The ovules are not enclosed by an ovary wall

Answer

A) They lack a seed coat

Answer

C) They do not contain embryos

Answer

D) They develop without fertilization

Question 7

What is the primary reserve food material stored in members of Chlorophyceae (green algae)?

Accepted Answer

A) Starch

Answer

B) Laminarin

Answer

C) Floridean starch

Answer

D) Glycogen

Question 8

Which of the following plant species belongs to liverworts (Hepaticopsida)?

Accepted Answer

C) Marchantia

Answer

A) Funaria

Answer

B) Sphagnum

Answer

D) Polytrichum

Question 9

Specialized roots called coralloid roots, which are associated with nitrogen-fixing cyanobacteria, are found in:

Accepted Answer

B) Cycas

Answer

A) Pinus

Answer

C) Ginkgo

Answer

D) Ephedra

Question 10

The cell wall of red algae (Rhodophyceae) consists primarily of cellulose, pectin, and:

Accepted Answer

A) Polysulfate esters

Answer

B) Chitin

Answer

C) Silica

Answer

D) Peptidoglycan

Question 11

Which group of plants is often referred to as vascular cryptogams?

Accepted Answer

C) Pteridophytes

Answer

A) Bryophytes

Answer

B) Gymnosperms

Answer

D) Angiosperms

Question 12

Floridean starch, which is structurally similar to amylopectin and glycogen, is the reserve food material in:

Accepted Answer

D) Rhodophyceae

Answer

A) Chlorophyceae

Answer

B) Phaeophyceae

Answer

C) Cyanophyceae

Question 13

In gymnosperms, where does the female gametophyte develop and remain retained?

Accepted Answer

A) Within the megasporangium (ovule)

Answer

B) Freely in soil

Answer

C) On external leaf surfaces

Answer

D) Inside the pollen grain

Question 14

Which of the following organisms is a unicellular green alga?

Accepted Answer

B) Chlamydomonas

Answer

A) Volvox

Answer

C) Spirogyra

Answer

D) Ulothrix

Question 15

The hydrocolloid algin, widely used commercially, is extracted from which algae group?

Accepted Answer

A) Brown algae

Answer

B) Red algae

Answer

C) Green algae

Answer

D) Blue-green algae

Question 16

The juvenile, creeping, green, branched, and filamentous stage in the life cycle of a moss is called:

Accepted Answer

C) Protonema

Answer

A) Leafy stage

Answer

B) Sporophyte

Answer

D) Seta

Question 17

Heterospory, the production of two distinct types of spores (macro and micro), is found in which pteridophytes?

Accepted Answer

B) Selaginella and Salvinia

Answer

A) Dryopteris and Adiantum

Answer

C) Equisetum and Psilotum

Answer

D) Lycopodium and Pteris

Question 18

Root-like structures that function in anchorage and absorption in bryophytes are called:

Accepted Answer

D) Rhizoids

Answer

A) Holdfasts

Answer

B) Setae

Answer

C) Rhizomes

Question 19

Double fertilization, involving syngamy and triple fusion, is a unique characteristic feature of:

Accepted Answer

A) Angiosperms

Answer

B) Gymnosperms

Answer

C) Pteridophytes

Answer

D) Bryophytes

Question 20

Most gymnosperms lack which of the following specialized conducting elements in their xylem?

Accepted Answer

B) Vessels

Answer

A) Tracheids

Answer

C) Xylem parenchyma

Answer

D) Xylem fibres

Grade 11 : Biology - Plant Kingdom (Set 1)