8
MCQ (Single Correct Answer)
The placenta is attached to the developing seed near the
A
testa
B
hilum
C
micropyle
D
chalaza
9
MCQ (Single Correct Answer)
Which of the following plants is used to extract the blue dye?
A
Trifolium
B
Indigofera
C
Lupin
D
Cassia
10
MCQ (Single Correct Answer)
Match the following columns.
| Column I | Column II | ||
|---|---|---|---|
| A. | Aleurone layer | 1. | Nutrition |
| B. | Parthenocarpic fruit | 2. | Without fertilisation |
| C. | Ovule | 3. | Seed |
| D. | Endosperm | 4. | Double fertilisation |
A
A-1, B-2, C-3, D-4
B
A-2, B-1, C-4, D-3
C
A-4, B-2, C-1, D-3
D
A-2, B-4, C-1, D-3
11
Roots obtain oxygen from air in the soil for respiration. In the absence or deficiency of $\mathrm{O}_2$, root growth is restricted or completely stopped. How do the plants growing in marsh lands or swamps obtain their $\mathrm{O}_2$ required for root respiration?
Explanation
The roots of the plants (e.g., Rhizophora) growing in marshy/swamp areas become negatively geotropic. They grow vertically upwards in air, above the soil level and respire so called respiratory roots or pneumatophores.
12
Write floral formula for a flower which is bisexual, actinomorphic sepals five, twisted aestivation, petals five valvate aestivation; stamens six, ovary tricarpellary, syncarpous, superior, trilocular with axile placentation.
Explanation
Floral formula is a formula by which we can describe the flower by using some symbols. The various symbols describing the above given conditions are as follows
(i) Bisexual 
(ii) Actinomorphic $\oplus$
(iii) Sepals five $\mathrm{K}_5$
(iv) Twisted aestivation
(v) Petals five $\mathrm{C}_5$
(vi) Valvate aestivation
(vii) Stamens $\mathrm{A}_6$
(viii) Tricarpellary ovary $G_3$
(ix) Syncarpus $\mathrm{G}_{(3)}$
(xi) Axile placentation 
Floral formula would be
