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Reg.No……………………… SYCBTA22/2Name………………………..
SECOND YEAR HIGHER SECONDARY REVISION EXAMINATION
Part – III
BIOLOGY
PART - A BOTANY
[Sexual reproduction in flowering plants]
PART I
A. Each carries 1 score.
1. Which one of the following is a haploid structure?
a) Zygote. c) Nucellus.
b) Egg. d) Embryo.
2. In the grass family the cotyledon is called ________.
3. Which type of pollination is functionally a cross-pollination but genetically a self
pollination?
4. What are parthenocarpic fruits ?
5. The residual, persistent nucellus present in black pepper seed is called ________.
6. What happens to integuments in a fertilised ovule?
PART II
B. Each carries 2 scores.
7. Differentiate between coleoptile and coleorhiza.
8. a) State whether the given statement is true or false
‘Mango is a true fruit whereas Apple is a false fruit.’
b) Justify your answer
.
9. Diagram of Anther lobe is given below.
(a) Label the wall layers A, B, and C.
(b) Name the wall layer which nourishes the developing pollen grains.
10. Which type of endosperm is seen in coconut water and coconut kernel?
11. Raju planted one Orange seed in a pot, but to his surprise he observed three seedlings
sprouting from it.
Can you help him to explain the reason of this phenomenon?
12. Wheat is an albuminous seed and groundnut is an ex-albuminous seed.
Why are they called so?
,13. A. What are pollen banks?
B. What is its importance?
PART III
A. Each carries 3 scores.
14. A. Point out any two features of pollen grains of water pollinated flower.
B. Assign the following plants with respect to the type of pollination in the table given
below.
a. Water hyacinth b. Vallisneria
c. Yucca d. Corn/Maize
Wind pollination Water pollination Insect pollination
15. a. Complete the developmental stages of a Dicot embryo starting from zygote to mature embryo.
Zygote → Proembryo →_____(a)_______ → _____(b)____ → Mature embryo.
b. Label the parts A, B, C & D in the given figure of mature embryo.
16. Give reasons for the following:-
a. In cleistogamous flowers seed-set is assured even in the absence of pollinators.
b. Emasculation is necessary in artificial hybridisation of a bisexual flower.
c. Pollen grains are well preserved as fossils.
17. Observe the figure given below,
a. Identify the structure.
b. Label the parts marked as A, B, C & D.
c. What is the function of the structure marked as D.?
, 18. Flowering plants have developed many devices to discourage self pollination
and to encourage cross pollination.
Explain any three such outbreeding devices.
19. a) Construct a flow chart showing the development of male gametes within the
anther.
(Hint: Vegetative cell, Microspore tetrad, Microspore mother cell, Generative cell,)
b). Since two types of fusions takes place in an embryo sac the phenomenon is termed double
fertilisation, an event unique to flowering plants.
1) What are the two types of fusions?
2) Write is the ploidy of the products of double fertilisation?
20. a) A diagrammatic view of a typical anatropous ovule is given below.
Label the parts A, B, C, & D.
b) Explain the Monosporic type of embryo sac development in flowering plants.
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