11. Plant tissues are of how many types?
[A] 3
[B] 2
[C] 5
[D] 6
Show Answer
Correct Answer: A [3]
Notes:
Plants have only three tissue types: 1) Dermal; 2) Ground; and 3) Vascular. These tissues can be simple, consisting of a single cell type, or complex, consisting of more than one cell type.
12. Which of the following forms of Nitrogen is taken up by Higher Plants? (UPSC Prelims 1979).
[A] Nitrites only
[B] Nitrates only
[C] Nitrates and Ammonium
[D] Urea
Show Answer
Correct Answer: C [Nitrates and Ammonium]
Notes:
Plants absorb ammonium and nitrate during the nitrogen assimilation process, after which they are converted into nitrogen-containing organic molecules, such as amino acids and DNA. Animals cannot absorb nitrates directly. They receive their nutrient supplies by consuming plants or plant-consuming animals.
13. Which vitamin is also called as niacin?
[A] Vitamin C
[B] Vitamin B3
[C] Vitamin B12
[D] Vitamin B9
Show Answer
Correct Answer: B [Vitamin B3]
Notes:
Vitamin B3 is also called as niacin/Nicotinic acid with chemical formula C6H5NO2. Niacin is water soluble vitamin.
14. What does H denote in the popular term HIV ?
[A] Human
[B] Higher
[C] Hybrid
[D] NOTA
Show Answer
Correct Answer: A [Human]
Notes:
The Human Immunodeficiency Virus (HIV) are two species of lentivirus. It causes life-threatening disease of AIDS in humans and infects them. HIV is a sexually transmitted infection and occurs by contact with or transfer of blood, pre-ejaculate, semen, and vaginal fluids.
15. Who among the following is considered as the father of microbiology?
[A] Stephen Hales
[B] Antonie Van Leeuwenhoek
[C] Edwin John Butler
[D] Pier Antonio Micheli
Show Answer
Correct Answer: B [Antonie Van Leeuwenhoek]
Notes:
Antoine van Leeuwenhoek used the single-lens microscope he built to make the first observations of bacteria and protozoa. Leeuwenhoek is universally acknowledged as the father of microbiology.
16. Which of the following vitamins was crystallized by Harry Holmes and Ruth Corbet?
[A] Vitamin A
[B] Vitamin B
[C] Vitamin C
[D] Vitamin E
Show Answer
Correct Answer: A [Vitamin A]
Notes:
Harry Holmes and Ruth Corbet isolated and crystallized vitamin A in 1937. Vitamin A is important for normal vision, the immune system, and reproduction.
17. Viral DNA is removed from the host’s chromosomes and the lytic cycle is called which of the following process?
[A] spontaneous induction
[B] inductive infection
[C] resultant induction
[D] spontaneous infection
Show Answer
Correct Answer: A [spontaneous induction]
Notes:
Viral DNA is removed from the host’s chromosomes and the lytic cycle is called spontaneous induction.
18. Which plant tissue is the only tissue with the highest refractive index due to the presence of pectin?
[A] Sclerenchyma
[B] Collenchyma
[C] Parenchyma
[D] Laticiferous
Show Answer
Correct Answer: B [Collenchyma]
Notes:
Collenchyma tissue is the only tissue with the highest refractive index due to the presence of pectin.
19. Where are the apical meristems found?
[A] apex
[B] roots
[C] buds
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Apical meristems are found at the apex, or tip, of roots and buds. This allows roots and stems to grow in length and differentiate into leaves and flowers.
20. Which fruit is produced by parthenocarpy?
[A] Brinjal
[B] Apple
[C] Banana
[D] Jackfruit
Show Answer
Correct Answer: C [Banana]
Notes:
Banana fruit is produced by parthenocarpy. The process of development of fruit without any prior fertilization is called parthenocarpy.
