Download Junior Inter Botony Questions English Medium

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Junior Inter Botany
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2 Marks Questions
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Name a plant that has single fruit developing from the entire inflorescence.
What is such a fruit called?
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A: Pine apple / Jack fruit (any one)
★ Composite fruit
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What is the type of fruit found in mango? How does it differ from that of
coconut?
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A: Drupe.
★ The mesocarp in mango is fleshy, juicy and edible whereas the mesocarp in
coconut is fibrous.
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What is meant by pulvinous leaf base? In members of which angiospermic
family do you find them?
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A: Swollen leaf base which stores water is called pulvinous leaf base. It is found in
the family Leguminosae.
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Define vivipary with an example.
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A: The germination of seed while still attached to the mother plant is called
vivipary.
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e.g.: Rhizophora (Mangrove).
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What is meant by heterospory? Mention the two types of spores developed in an
angiospermic plant.
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A: Production of two types of spores from a plant is termed as heterospory. The two
types of spores developed in angiosperms are microspores and megaspores.
6.
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Name the parts of pistil which develop into fruit and seeds.
A: Ovary develops in a fruit.
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Ovules develop into seeds.
7.
What are the three cells found in the pollen grain when it is shed at the three
celled stage?
A: One vegetative cell and two male gametes.
R-27-12-14
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8.
Name the parts of an angiosperm flower in which development of male and
female gametophyte take place.
A: Male gametophyte develops in androecium (pollen grains-microspore).
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★ Female gametophyte develops in gynoecium (nucellus of ovule-megaspore).
9.
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Mention two strategies evolved to prevent self-pollination in flowers.
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A: Dichogamy, herkogamy, heterostyly, dicliny and self-sterility (any two).
10. What is meant by scutellum? In which type of seeds is it present?
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A: The single cotyledon present towards lateral side of the embryonal axis in a
monocot seed is called scutellum. It is found in the seeds of grass family
(monocot seeds).
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11. What is Natural system of plant classification? Name the scientists who
followed it.
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A: The system of plant classification which is based on all important morphological
characters is called Natural system of plant classification. Bentham and Hooker.
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12. What is geocarpy? Name the plant which exhibits this phenomenon.
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A: The fruit which develops inside the soil is called geocarpy. Arachis hypogea.
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4 Marks Questions
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13. List the changes observed in angiosperm flower subsequent to pollination
and fertilisation.
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A: An angiosperm flower shows the following changes after pollination and
fertilization:
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★ Zygote develops into an embryo by cell division and differentiation.
★ The ovules develop into seeds.
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★ The ovary develops into a fruit.
★ The sepals, petals and stamens of the flower wither and fall off.
14. Distinguish between asexual and sexual reproduction. Why vegetative
reproduction is also considered as a type of asexual reproduction?
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A:
Sexual reproduction
Asexual reproduction
★ Generally the offsprings are ★ One or two parents may be
involved in production of
produced by a single parent.
offsprings.
★ There is no fusion of gametes or ★ Fusion of gametes (fertilization)
takes place.
fertilization.
★ It occurs in single celled or ★ It occurs in relatively complex
organisms.
relatively simple organisms.
★ It is a simple process like binary ★ It is an elaborate and slow
process.
fission and budding.
★ The offsprings are identical to ★ The offsprings are not identical
to the parents or among
the parent.
themselves.
(Note: Write at least three differences)
★
As vegetative reproduction also does not involve formation of gametes and
fertilization it is also considered as a type of asexual reproduction.
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15. Discuss the various types of pollen tube entry into ovary with the help of
diagrams.
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A: The pollen tube travels through the style and enters the ovary. Different types of
pollen tube entry into the ovary are:
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Porogamy: The pollen tube enters the ovary through the micropyle.
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Chalazogamy: The pollen tube enters the ovary through the chalaza.
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Mesogamy: The pollen tube enters the ovary through the integuments.
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pollen
tube
pollen
pollen
tube
tube
A-Porogamy
B-Chalazogamy
C-Mesogamy
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16. Give economic importance of plants belonging to Fabaceae.
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Economic importance of plants belonging to Fabaceae: Plants like red gram
and black gram are used as pulses (good source of protein). Soyabean and ground
nut yield oil.
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★ Pods of beans, seeds of peas, leaves of Methi are used as vegetables and green
leaves.
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★ Timber is obtained from Indian rose wood (red sanders).
★ Blue dye is obtained from Indigofera tinctoria and yellow dye from Butea
monosperma.
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★ Derris or Pongamia is used in medicines.
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★ Phaseolus and other species are used as fodder. Sesbania and Tephrosia are
used as green manure.
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Writer: P. Uma Amareswari
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