GITARATTAN JINDAL PUBLIC SCHOOL
ROHINI, DELHI-110085
ASSIGNMENT – 1 (2013-14)
CHAPTER – 1 & 2
CLASS : XII
SUBJECT : BIOLOGY
Attempt all the questions :Q1.
Q2.
Why is vegetative propagation considered as a sexual reproduction?
Differentiate between asexual and sexual reproduction.
Q3.
Differentiate between oestrous cycle and menstrual cycle.
Q4.
What do the terms monoecious and dioecious mean?
Q5.
Differentiate syngamy from fertilization.
Q6.
What are vegetative propagules? Name any four of them along with an example for each.
Q7.
How does sponge reproduce asexually? Show it diagrammatically.
Q8.
What are parthenocarpic fruits? Name the hormone that can induce the formation of such fruits.
Q.9.
What is self-incompatibility? Why does self pollination not lead to seed formation in self-incompatible
species?
Q.10.
Differentiate between:
hypocotyl and epicotyl
coleoptile and coleorrhiza
bagging and emasculation
Cleistogamous and chasmogamous flowers.
Q11.
What is the significance of pollination?
Q12.
Mention the rewards offered to pollinators by flowers.
Q.13
Is cleistogamy advantageous or disadvantageous to plants? Why?
Q.14
What is polyembryony? Name two plants that show it.
Q.15
Draw the labelled diagrams of the following and label its parts:(i) mature pollen grains in angiosperms
(ii) L.S of an embryo of grass
(iii) mature embryo –sac
(iv) anatropous ovule
Q.16
Describe the stages in embryo development in a dicot plant.
Q.17
Pistil of a flower does not accept pollen from any plant other than from its own kind. How does it
happen? Explain.