Grade 11 : Biology - Plant Kingdom (Set 3)

Question 1

Which system of taxonomy relies on the chemical constituents of plants to resolve confusions in plant classification?

Accepted Answer

C) Chemotaxonomy

Answer

A) Cytotaxonomy

Answer

B) Numerical taxonomy

Answer

D) Karyotaxonomy

Question 2

In green algae (Chlorophyceae), stored food is held in pyrenoids. What is the typical chemical composition of their cell wall layers?

Accepted Answer

A) Inner cellulose and outer pectose

Answer

B) Inner pectose and outer cellulose

Answer

C) Inner chitin and outer pectin

Answer

D) Inner suberin and outer lignin

Question 3

Floridean starch, the major reserve food material stored in red algae (Rhodophyceae), is structurally most similar to:

Accepted Answer

B) Amylopectin and glycogen

Answer

A) Amylose and chitin

Answer

C) Cellulose and pectose

Answer

D) Laminarin and mannitol

Question 4

Brown algae (Phaeophyceae) contain chlorophyll a, chlorophyll c, and fucoxanthin. Their reserve food materials are stored as:

Accepted Answer

B) Laminarin and mannitol

Answer

A) Floridean starch and glucose

Answer

C) Glycogen and sucrose

Answer

D) Paramylon and amylose

Question 5

Gemmae are green, multicellular, asexual buds that detach to form new individuals. In which bryophyte genus are gemmae cups commonly found?

Accepted Answer

B) Marchantia

Answer

A) Funaria

Answer

C) Polytrichum

Answer

D) Sphagnum

Question 6

In the moss life cycle, what is the juvenile stage that develops directly from a germinating haploid spore?

Accepted Answer

B) Protonema stage

Answer

A) Leafy stage

Answer

C) Sporogonium stage

Answer

D) Capsule stage

Question 7

Why are Bryophytes referred to as the 'amphibians of the plant kingdom'?

Accepted Answer

B) They live in soil but require water for sexual reproduction

Answer

A) They live exclusively under deep freshwater bodies

Answer

C) They lack chlorophyll and ingest aquatic microscopic prey

Answer

D) They produce true fruits with waterproof coats

Question 8

Which group of land plants was the first to evolve vascular tissues (xylem and phloem)?

Accepted Answer

B) Pteridophytes

Answer

A) Bryophytes

Answer

C) Gymnosperms

Answer

D) Algae

Question 9

Heterospory, the production of two distinct kinds of spores (microspores and megaspores), is prominently seen in which pair of pteridophytes?

Accepted Answer

B) Selaginella and Salvinia

Answer

A) Psilotum and Adiantum

Answer

C) Equisetum and Dryopteris

Answer

D) Lycopodium and Pteris

Question 10

Equisetum (commonly known as horsetail) belongs to which class of Pteridophytes?

Accepted Answer

C) Sphenopsida

Answer

A) Psilopsida

Answer

B) Lycopsida

Answer

D) Pteropsida

Question 11

Statement I: Pinus roots show fungal association in the form of mycorrhiza.
Statement II: Cycas roots show specialized coralloid roots associated with $N_2$-fixing cyanobacteria.

Which of the following evaluations regarding Statement I and Statement II is correct?

Accepted Answer

C) Both Statement I and Statement II are true

Answer

A) Statement I is false, but Statement II is true

Answer

B) Statement I is true, but Statement II is false

Answer

D) Both Statement I and Statement II are false

Question 12

Gymnosperms are classified as 'naked-seeded' plants because:

Accepted Answer

B) Their ovules are not enclosed by an ovary wall

Answer

A) Their seeds lack testae and tegmens

Answer

C) Their flowers lack petals and sepals

Answer

D) They produce seeds outside the archegonia

Question 13

In Gymnosperms, endosperm is formed prior to fertilization. What is the ploidy level of gymnosperm endosperm?

Accepted Answer

C) Haploid ($n$)

Answer

A) Triploid ($3n$)

Answer

B) Diploid ($2n$)

Answer

D) Tetraploid ($4n$)

Question 14

Conifers such as Pinus feature needle-like leaves, thick cuticles, and sunken stomata. What primary function do these xerophytic features serve?

Accepted Answer

B) Minimize water loss during transpiration

Answer

A) Increase photosynthetic surface area

Answer

C) Maximize oxygen uptake from high altitude air

Answer

D) Prevent light damage during winter snowfall

Question 15

Which of the following algal genera exhibits a haplontic life cycle where the zygote is the only diploid cell?

Accepted Answer

B) Volvox

Answer

A) Fucus

Answer

C) Polysiphonia

Answer

D) Kelps

Question 16

While the vast majority of green algae exhibit a haplontic life cycle, which brown alga exhibits a diplontic life cycle?

Accepted Answer

C) Fucus

Answer

A) Spirogyra

Answer

B) Chlamydomonas

Answer

D) Volvox

Question 17

Which pair of algal genera displays a haplo-diplontic life cycle pattern?

Accepted Answer

B) Ectocarpus and Polysiphonia

Answer

A) Volvox and Spirogyra

Answer

C) Fucus and Chlamydomonas

Answer

D) Ulothrix and Volvox

Question 18

Agar-agar, widely used in culture media, ice creams, and jellies, is commercially obtained from which red algae?

Accepted Answer

B) Gelidium and Gracilaria

Answer

A) Chlorella and Spirulina

Answer

C) Laminaria and Sargassum

Answer

D) Porphyra and Dictyota

Question 19

Algal Class	Flagellar Number	Position of Insertion
Chlorophyceae	2-8, equal	Apical
Phaeophyceae	2, unequal	Lateral
Rhodophyceae	Absent	Absent

Based on the table, which statement accurately characterizes the motile stages of Phaeophyceae?

Accepted Answer

B) Motile cells have 2 unequal laterally attached flagella

Answer

A) Gametes have 2-8 equal apical flagella

Answer

C) Motile stages are completely absent

Answer

D) Motile cells have numerous equal lateral flagella

Question 20

Classification systems that are based on evolutionary relationships between various organisms are termed:

Accepted Answer

C) Phylogenetic classification systems

Answer

A) Artificial classification systems

Answer

B) Natural classification systems

Answer

D) Numerical taxonomy systems

Grade 11 : Biology - Plant Kingdom (Set 3)