Class XI Biology
Tuesday 31 October 2017
Friday 20 October 2017
Plant growth regulators
Plant Growth Regulators by Nidhi gupta on Scribd
Tuesday 22 August 2017
Friday 26 May 2017
Holiday Homework Assignment
DAV
Public School, Kailash Hills
Holiday
Homework (2017-18)
Class
XI (Biology)
Based on your understanding of The Living World, attempt the following
questions:
Q1.What changes are needed to convert a prokaryotic
cell into a eukaryotic cell?
2. Give one distinct characteristic which separates
human being from all other living organisms.
3. Ravi is a biology student. He visited a
zoological park with his younger brother and in front of the lion enclosure
they observed an information board with Panthera
leo written on it. His brother was confused what it meant. What would Ravi
explain to him?
4. The common name of pea is simpler than its
botanical name Pisum sativum. Why
then is the simpler common name not used instead of the complex scientific name
in biology?
5.
Suppose you accidentally find an old preserved permanent slide without a label.
In your effort to identify it you placed the slide under microscope and observe
the following features:
a.Unicellular
b)well defined nucleus c)
biflagellate –one flagellum lying longitudinally and the other transversely.
What would you identify it as? Can you name the
kingdom it belongs to?
6. A virus is considered as a living organism and an
obligate parasite when inside a host cell. But virus is not classified along with
bacteria or fungi. What are the characteristics of virus that are similar to
nonliving objects?
7. Why is the spread of living pteridophytes limited
and restricted to narrow geographical regions?
8. Aniket visited Deer Park and found the lake there
had green coloured water. What could be the green colour of water due to?
9. On rainy days you find green carpet like
structure on the walls. Which plant group does it belong to? What are such
plants commonly known as?
10.
Lichen is usually cited as an example of symbiosis in plants where an algal and
fungal species live together for their mutual benefit. Which of the following
will happen if algal and fungal partners are separated from one another?
a) Both
will survive normally and independent of each other.
b) Both
will die
c) Algal
component will survive while fungal component will die
d) Fungal
component will survive while algal component will die.
Based on your answer
how do you justify this assosciation as symbiosis?
11. What is the importance of pneumatic bones and
air sacs in Aves?
12. To which Phylum of Sand dollars, sea cucumbers
and sea lilies belong to? What kind of symmetry do the adult representatives of
this phylum have? Also mention what is specific about their body cavity?
13. Ksitij was watching discovery channel and he
came to know about an animal which has a prominent head bearing large eyes and
foot is modified partly into funnel and partly into 8-10 sucker bearing arms
that surround the mouth. Identify the phylum to which this animal belongs and
also one characteristic feature of the phylum.
14. There is a group of animals commonly called as
‘animals with jointed feet’.They have bilateral symmetry, are triploblastic,
have open circulatory system and malphigian tubules as excretory organs.
Identify the phylum. Give an example of their fossil member
representative.
15.
The young one of an animal looks different from the adult member. The body of
both the young one and the adult can be divided in two equal halves. In young
ones we can label the two halves as left and right one but we cannot do so in
adult form.
a)
Identify the phylum.
b)
What kind of development is being shown?
c)
What kind the symmetry is possessed by young one and the adult?
16.
Hitesh’s mother purchased a plant from the gardener. The plant leaves had
parallel venation, and the flowers of the plant were having beautiful purple
petals. Harish observed each flower had precisely six petals without any
mistake. He was surprised by the precision in nature and also was able to
identify the group the plant belonged to? What conclusions could Hitesh have
drawn about the plant classification and how?
Tuesday 9 May 2017
Support material class Xi
Class xi biology support material
This book contains notes in nut shell. It is developed by Delhi government teachers under Department of Education.
(It has some typing errors..You may correct the errors in this support material and may use it as helping notes)
You MUST study NCERT textbook thoroughly .
This book contains notes in nut shell. It is developed by Delhi government teachers under Department of Education.
(It has some typing errors..You may correct the errors in this support material and may use it as helping notes)
You MUST study NCERT textbook thoroughly .
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