DEPARTMENT OF GENETICS AND PLANT BREEDING
COLLEGE OF AGRICULTURE, GKVK, BENGALURU–560065
PRACTICAL EXAM
Date: 23.12.2024
Time: 20 min
Max Marks: 10
III B.Sc. (Hons.) Agriculture ‘A’ Sec
GPB.311 Crop Breeding (1+1)
ID. No.: ____________
1. Choose the correct answer:
(0.50 × 10 = 5.0)
1. Brassica napus is:
a) A self-incompatible, cross-pollinated crop but capable of self-pollination up to 30%
b) A self-incompatible, cross-pollinated crop but capable of cross-pollination up to 30%
c) A self-compatible, self-pollinated crop but capable of cross-pollination up to 30%
d) A self-compatible, self-pollinated crop but capable of self-pollination up to 30%
2. Which of the following statements are correct with respect to cotton?
i) Cotton is an often cross-pollinated crop
ii) Flowers of Asiatic types open earlier than American types
iii) Pollen directly sheds on the stigma, causing self-pollination
iv) Cross-pollination is due to wind
v) The ring method is one of the selfing techniques used
a) i, ii, iii, iv, v
b) i, ii, v
c) i, iii, iv, v
d) i, iii, v
3. The post-fertilization elongation of the ovary that pushes it into the soil, leading to pod formation in groundnut, is known as:
a) Stalk of the ovary
b) Gynophores
c) Corolla
d) Stamen
4. In Corchorus olitorius, cross-pollination of up to 10–15% occurs primarily due to:
a) Wind
b) Insects
c) Bats
d) Both wind and insects
5. The Soda Straw method is a crossing technique used in:
a) Castor
b) Sesame
c) Cotton
d) Both Sesame and Cotton
6. Which of the following statements regarding castor are incorrect?
i) The raceme of monoecious inflorescence contains 30–50% staminate flowers in the upper portion and 30–50% pistillate flowers in the lower portion
ii) Castor is a sexually polymorphic species
iii) In sex reversal variants, nitrogen deficiency induces the inflorescence to become pistillate
iv) Staminate and ISFs appear in the inflorescence when temperatures exceed 32°C
v) The N-type pistillate mechanism is analogous to the GMS system
a) i, ii, iii, iv, v
b) i, iii, iv
c) iii, iv, v
d) i, ii, iv
7. In sugarcane, an arrow consists of:
a) Hermaphrodite flowers
b) Male and female flowers
c) Hermaphrodite and female flowers
d) Hermaphrodite and male flowers
8. How many stamens are present in a single disc floret of sunflower?
a) 5
b) 3
c) 4
d) >10
9. In chickpea, emasculation performed the previous day followed by pollination the next morning results in a better seed set in:
a) Northern India
b) Southern India
c) Both Northern and Southern India
d) Neither of them
10. The number of stamens present in an individual spikelet of rice is:
a) 5
b) 3
c) 4
d) 6
11. Describe the pollination behavior and the mechanism promoting them for the following crop plants:
(1 × 5 = 5)
a) Sorghum
b) Wheat
c) Castor
d) Sugarcane
e) Sunflower
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