Q. 1. Write the location and function of the following
Cytoskeleton
Phytol chain
Synergid
Sieve tube element
Centromere
Sol.
Location– Cytoplasm of eukaryotic cell.
Function– Support to the cell
Location– Chlorophyll
Function– Anchors the chlorophyll molecule into the lipid part of thylakoid membrane.
Location– Embryo sac
Function– Secreting chemotactically active substance for attracting pollen tube and forming seat for pollen
tube discharge.
Location– Phloem
Function– Translocation of solute
Location– Chromosome
Function– Attachment of spindle fibres.
Q. 2.
(a)
What is shown in diagram (a)?
What are (P) and (Q)?
(b)
Tell whether it is T1- phage or T2- phage?
(c)
Which type of ovule is this?
Give one reason.
(d)
What is this type of flower called?
Give examples of such flower:
(e)
Which type of aestivation is this? Give examples?
Nostoc ; (P) = Heteroayst; (Q) = Akinete
T2 -phage, (a) collar, (b) Tail fibre
Anatropous ovule, Body of the ovule is inverted.
Epigynous flower, e.g., Cucurbitaceae, Asteraceae
Vexillary or des cending imbricate, e.g., Soyabean, Gram, Crotolaria, etc.
Q. 3. Write down the types of placentation, inflorescence and fruit of the following
Pea
Coriander
Wheat
Sunflower
Mustard
Sol.
S. N.
Plant
Placentation
Inflorescence
Fruit
(a)
Pea
Marginal
Solitary axillary or terminal, raceme
Pod orlegume
(b)
Coriander
Axile
Compound umbel
Ceremocarp
(c)
Wheat
Basal
Spike of spike of spikelet
Caryopsis
(d)
Sunflower
Basal
Capitulum
Cypsela
(e)
Mustard raceme
Parietal
Corymbose
Siliqua
Q. 4. Differentiate between the following [Give one important difference]
Culm and Caudex
Slime moulds and fungi
Cyathium and hypanthodium
Biological magnification and eutrophication
White rust and Brown rust
Sol.
(a)
Culm
Caudex
Joint stem with solid nodes and hollow
internodes e.g., Bambusa
Unbranched cylindrical stem with crown of leaves at
apex. Marked with scars of fallen leaves e.g., Coconut
(b)
Slime moulds
Fungi
Vegetative cell without cell wall but spores with cellulosic cell wall
Vegetative cell with cell wall made up of either fungal cellulose or chitin or both.
(c)
Cyathium
Hypanthodium
Peduncle terminates into a single female flower. It is surrounded by a large number of male flowers in scorpoid
cyme. Whole inflorescence is enclosed within a cup shaped involucre. Male flowers are represented only by a single
stamen. Female flower is represented only by a tricarpellary pistil e.g.,
Euphorbia.
Main axis forms a flesly cup-shaped receptacle. It has an apical opening called ostiole. Unisexual flowers
are borne on the inner wall of the cup in cymose groups. Male flower are near the ostiole and fertile female flowers at the base of the cup. Besides these,
sterile female flowers called gall flowers are also present e.g., Ficus.
(d)
Biological magnification
Eutrophication
Non-biodegradable pesticides pass into food chain and increase in amount per unit weight of organisms with the rise in trophic level due to their accumulation in fat tissue. The phenomenon is called
biomagnification.
Due to run off from fields, lawns and detergent rich sewage into the water body there is nutrient enrichment of the water body. The phenomenon is
called entrophication. It supports a dense growth of algae called algal bloom.
(e)
White rust
Brown rust
It is a fungal disease caused by Cystopus candidus or Albugo candidaon vegetative parts of crucifers.
It is a fungal disease caused by Puccinia reconditaon vegetative parts of wheat plant.
Q. 6. Fill in the blanks with suitable words given in boxes:
Marsilea
Coralloid root
Usnea
Eichhornia
Monoecious
Pneumatophores
Geitonogamy
Cycas
Pinus
Dioecious
Vivipary
Xenogamy
Oscillatoria
Rhizophorahas both _______________________and _________________
(b) Aquatic plants are ______________________(Pteridophyte) and_______________________(Angiosperm)
(c) Plant bearing both male and female flowers is called______________and the pollination between different
flowers of the same plant is called_______________.
____________has ______________.
Sol.
Pneumatophores, Vivipary
Marsilea, Eichhornia
Monoecious, Geitonogamy
Cycas, Coralloid root
Q. 7.
Give any two conditions for seed habit.
Which of these shows tendency of seed habit?
Lycopodium
Equisetum
Selaginella
Pteris
Dryopteris
Pteridiun
Suggest three ways to break seed dormancy.
Sol.
Heterospory, formation of female gametophyte inside magasporangium.
Habitat is a place where an organism lives. It represents a particular set of environmental conditions suitable for its
successful growth.
Niche represents not only the place where an organism lives but the range of conditions and resource qualities within which a species can
survive and reproduce.
(b)
Flora
Vegetation
Total number of plant species found in an area constitutes it’s flora.
Types of plants found in an area constitute the vegetation of the area e.g., Xerophytic vegetation is found in deserts.
