ECONOMIC BOTANY And OTHERS (Part-I)

11. What is the yellow dust present in the middle of a flower called? [S.S.C. Online Graduate Level (T-I) 9.03.2020 (Shift-I)]

(a) Sperm
(b) Stomata
(c) Pollen
(d) Zygote

Correct Answer: (c) Pollen

Solution:Pollen
The yellow, powdery substance found in the center of a flower is called pollen. It contains the male reproductive cells of the plant, essential for fertilization and the production of seeds.

12. In which part of the female flower does fertilization take place? [S.S.C. Online Graduate Level (T-I) 11.06.2019 (Shift-III)]

(a) Filament
(b) Ovary
(c) Style
(d) Stigma

Correct Answer: (b) Ovary

Solution:Ovary
Fertilization in a female flower occurs within the ovary. The ovary houses the ovules, which, upon successful fertilization by pollen, develop into seeds.

13. Banana freckle is a plant disease. It is caused by _____ . [S.S.C. Online CHSL (T-I) 9.01.2017 (Shift-I)]

(a) Virus
(b) Fungus
(c) Bacteria
(d) Insect

Correct Answer: (b) Fungus

Solution:Fungus
Banana freckle is a plant disease caused by a fungus. This fungal infection leads to characteristic dark spots or "freckles" on the fruit and leaves of banana plants, affecting their quality.

14. Which of the following is also known as common Water Hyacinth? [S.S.C. Online CHSL (T-1) 7.01.2017 (Shift-I)]

(a) Pistia
(b) Opuntia
(c) Aegilops
(d) Eichhornia

Correct Answer: (d) Eichhornia

Solution:Eichhornia
Eichhornia is the genus name for the common water hyacinth (Eichhornia crassipes). This free-floating aquatic plant is well-known for its beautiful purple flowers but is also a notorious invasive species due to its rapid growth.

15. Tectona grandis Linn is the scientific name of ____ . [S.S.C. Online CHSL (T-I) 7.01.2017 (Shift-I)]

(a) Guava
(b) Teak
(c) Amla
(d) Chiku

Correct Answer: (b) Teak

Solution:Teak
Tectona grandis Linn is the scientific name for Teak. Teak is a highly valued hardwood tree, renowned for its durable, water-resistant timber used extensively in furniture, decking, and boat building.

16. On which tree are silkworms generally reared? [S.S.C. Online Stenographer 13.09.2017 (Shift-I)]

(a) Apple
(b) Mulberry
(c) Guava
(d) Jamun

Correct Answer: (b) Mulberry

Solution: Mulberry
Silkworms are primarily reared on mulberry trees. The leaves of the mulberry tree are the sole food source for silkworm larvae, which are cultivated for silk production.

17. Silk worms feed on- [S.S.C. Online Graduate Level (T-I) 29.08.2016 (Shift-I)]

(a) Basil leaves
(b) Curry leaves
(c) Rose leaves
(d) Mulberry leaves

Correct Answer: (d) Mulberry leaves

Solution:Mulberry leaves
Silkworms exclusively feed on mulberry leaves. This specific diet is crucial for their growth and the production of high-quality silk fibers.

18. Which fibre among the following is used to make rayon clothing? [S.S.C. Online C.H.S.L. (T-I) 12.08.2021 (Shift-II)]

(a) Cellulose
(b) Mucilage
(c) Pectin
(d) Gum

Correct Answer: (a) Cellulose

Solution:Cellulose
Rayon is a semi-synthetic fiber made from regenerated cellulose. This cellulose is typically derived from wood pulp, which undergoes chemical processing to create the rayon fibers used in clothing.

19. The arrangement of leaves on an axis or stem is called _____ . [S.S.C. Online CHSL (T-1) 24.01.2017 (Shift-I)]

(a) Phyllotaxy
(b) Vernation
(c) Venation
(d) Phytotaxy

Correct Answer: (a) Phyllotaxy

Solution:Phyllotaxy
Phyllotaxy describes the characteristic arrangement of leaves on a plant stem or axis. This arrangement can vary greatly among plant species, optimizing light capture and nutrient distribution for photosynthesis.

20. Which of the following is also used as a Bio-fertilizer? [S.S.C. Online CHSL (T-I) 15.01.2017 (Shift-III)]

(a) Urea
(b) Ammonia
(c) Uric Acid
(d) Nitrates

Correct Answer: (b) Ammonia

Solution:The term biofertilizer is used for fertilizers obtained from organisms. Ammonia is produced by bacteria in the soil and is then converted into essential nutrients such as nitrates. Ammonia is produced by Anabaena and cyanobacteria, as ammonia is used by plants as a fertilizer/nutrient. Therefore, being produced by living organisms, it is also used as a biofertilizer.