Passage Based Questions
18.(A) Complete the given passage with appropriate words or
phrases.
Red algae are marine except a few freshwater species
like (i). The red colour is due to abundant formation of (ii)
which is able to absorb (iii) wavelengths of light. The
photosynthetic organelles are called (iv). The reserve food is
(v) which is very much similar to (vi) Asexual reproduction
occurs through a variety of (vii) while sexual reproduction
is (viii). The male sex organ is called (ix) and the female
sex organ is called (x).(B) Read the given passage and correct the errors, wherever
present.
Ferns are seed producing vascular plants which inhabit dry
areas. They constitute the smallest living group of primitive
vascular plants. Ferns dominated the earth in permian
period. Leaves are large and called ramenta. Mature leaves
show circinate ptyxis. Younger parts of their stem, leaves
and petiole possess hairs called fronds.
Assertion & Reason
In each of the following questions, a statement of Assertion (A)
is given and a corresponding statement of Reason (R) is given
just below it. Of the statements, mark the correct answer as :
(a) if both A and R are true and R is the correct explanation of A
(b) if both A and R are true but R is not the correct explanation of A
(c) if A is true but R is false
(d) if both A and R are false.
- Assertion : In gymnosperms, the male and female
gametophytes do not have independent existence.
Reason : They remain within the sporangia retained on
the sporophyte.
- Assertion : Gymnosperms do not produce fruit.
Reason : Ovules of gymnosperms are enclosed within the
ovaries. - Assertion : Algae show only anisogamous type of
reproduction.
Reason : In algae, gametes can never be non-flagellated. - Assertion : In bryophytes, there is progressive sterilisation of
sporogenous tissue as we move from lower to higher forms.
Reason : In mosses the sporogenous tissue is present
inside the capsule that includes columella. - Assertion : Pteridophytes are known as botanical snakes.
Reason : The stem of pteridophyte is a rhizome which
grows obliquely under the surface of soil with only apical
portion coming out of soil surface.
- Assertion : Flower is the characteristic feature of
angiosperms.
Reason : Flower ensures fertilisation of the ovule and
development of fruit containing seeds.
- Assertion : True stem and leaves are absent in bryophytes.
Reason : In bryophytes, sporophyte is parasitic over
gametophyte. - Assertion : In green algae, sexual reproduction occurs
through palmella stage.
Reason : In palmella stage, two flagellated, thick walled cells
lie close to each other embedded in mucilagenous mass. - Assertion : Giant kelps are used as fertiliser.
Reason : Giant kelps are important source of minerals. - Assertion : In Marchantia, elaters are directly formed
from the sporogenous cells.
Reason : Elaters are haploid.
Figure Based Questions - Refer to the given figures and answer the following questions.
(a) Name the plants and their division respectively
represented by the given figures A and B.
(b) Which given plant belongs to the plant group known
as amphibians of the Plant Kingdom and why the
plant group is named so?
(c) Write economic importance of the division represented
by plant B.- Study to the given figure answer the following questions.
Meiosis
Gametes
(n) Fusion
Zygote
(2n)
Sporophyte
(2n)Sex organs
(2n)AB(a) Identify the type of life cycle along with A and B
shown in the given figure.
(b) Name two brown algae showing this type of life cycle.
(c) State the significance of this life cycle in fucales.
CHAPTER-4 : ANIMAL KINGDOM
Multiple Choice Questions- Sycon belongs to a group of animals which are best
described as
(a) unicellular or acellular
(b) multicellular without any tissue organisation
(c) multicellular with a gastrovascular system
(d) multicellular having tissue organisation, but no body
cavity.