SEXUAL REPRODUCTION IN FLOWERING PLANTS
PREVIOUS BOARD QUESTIONS
TO BE DONE IN YOUR CLASS NOTE BOOK:
1. The structure of bilobed anther consists of
A. 2 thecae, 2 sporangia
B. 4 thecae, 4 sporangia
C. 4 thecae, 2 sporangia
D. 2 thecae, 4 sporangia
2. To produce 400 seeds, the number of meiotic divisions required will be
A. 400
B. 200
C. 500
D. 800
3.
4.
In a fertilized ovule, n, 2n and 3n conditions occur respectively in
A. antipodal, zygote and endosperm
B. zygote, nucellus and endosperm
C. endosperm, nucellus and zygote.
D. antipodals, synergids and integuments
5. The thalamus contributes to the fruit formation in
A. banana.
B. orange.
C. strawberry.
D. guava.
6.
8. Self-pollination is fully ensured if
(A) the flower is bisexual.
(B) the style is longer than the filament.
(C) the flower is cleistogamous.
(D) the time of pistil and anther maturity is different.
9. A bilobed, dithecous anther has 100 microspore mother cells per microsporangium.
How many male gametophytes this anther can produce? 1mark
10. (a) You are given castor and bean seeds. Which one of the two would you select to
observe the endosperm ?
(b) The development of endosperm precedes that of embryo in plants. Justify. 2marks
11. When and where do tapetum and synergids develop in flowering plants ? Mention their
functions. 3marks
12. Where are the following structures present in a male gametophyte of an angiosperm ?
Mention the function of each one of them.
(a) Germ pore (b) Sporopollenin (c) Generative cell 3marks
13 A flower of tomato plant following the process of sexual reproduction
produces 240 viable seeds. Answer the following questions giving reasons :
(a) What is the minimum number of pollen grains that must have been
involved in the pollination of its pistil ?
(b) What would have been the minimum number of ovules present in the
ovary ?
(c) How many megaspore mother cells were involved?
(d) What is the minimum number of microspore mother cells involved in
the above case?
(e) How many male gametes were involved in this case? 5marks
14 Filiform apparatus in the embryo sac of an angiosperm is present at the micropyler tip of (a)
Central cell (b) Egg cell (c) Synergids (d) Antipodals
15
(a) Name the structure seen on the surface of black pepper and beet seeds, not seen on a
bean seed. Mention the part of the ovule its is a remnants of.
(b) Name the outer layer of a maize grain, and state where generally does this layer gets
developed in a flowering plant.
16 Name and explain the technique that can be used in developing improved crop varieties in plants
bearing female flowers only.
17
18
CRITICAL THINKING /CASE BASED/DIAGRAM BASED QUESTIONS:
QUESTION: 1
The below given picture is the viola plants.
What kind of pollination will the flower follow? why?
Can you give the technical name for these kind of flowers produced by Viola
plant?
If Viola plant need to ensure the formation of Assured seed sets what strategy
should the plant follow in the nature? Explain.
QUESTION-2
Observe the given diagram, and answer the following questions.
1. what kind of pollinating agent will help in pollinating such kind of flower?
2. What are the features of the following part of the flower if they want to support
for the pollinating agent: Stamens, stigma, Pollen grains, petals