NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Botany MCQs (Practice_Test 76 of 104)
Get unlimited access to the best preparation resource for competitive exams : get questions, notes, tests, video lectures and more- for all subjects of your exam.
- The number of hydrogen bonds needed to bind cytosine with guanine in a DNA stand is
- One
- Two
- Three
- Four
- Which one of the following combinations possesses the integrated protein synthesizing machinery?
- Ribosome, t-RNA, amino aid
- m-RNA, t-RNA and amino acid
- Ribosome, t-RNA, m-RNA and amino acid
- t-RNA, ribosome, nucleus and m-RNA
- Which one of the following secondary metabolites of plants has been used as fish poison?
- Tritcrpene
- Glycoside
- Carotene
- Saponin
- In plant tissue culture, induction of roots and shoots can be accomplished by
- Using tissue of a certain minimum size
- Using a specific concentration of sucrose in the culture medium
- Using a particular auxin-cytokinin ratio
- Manipulating physical factors such as duration of light, temperature, ph etc.
- Which one of the following statements is correct?
- Pollen wall proteins play an important role in determining sexual incompatibility
- Shape of the stigma plays an important role in sexual incompatibility
- Cryptic fertilization is an important phenomenon associated with sexual incompatibility
- Placental pollination helps in overcoming self incompatibility
- During germination of barley grain, the enzyme a-amylase is secreted by
- Seed coat
- Aleuronic layer
- Coleorhizae
- Coleoptiles
- Verbalization is used to overcome chemical dormancy in seeds. The temperature range used for this purpose is
- Zero to 4 degrees C
- 15 to 20 degrees C
- 20 to 30 degrees C
- 30 to 40 degrees C
- Which of the following pairs are correctly matched?
- Match Item 1: Nutation
- Match Item 2: Movement of growing tips of twining plants
- Match Item 1: Traumatotropism
- Match Item 2: Curvature of due to injury to plant organs.
- Match Item 1: Thigmotropism
- Match Item 2: Movement of tendrils due to contact.
- Match Item 1: Seism nasty
- Match Item 2: Movements caused by change in turgor pressure.
- Select the correct answer using the codes given codes below:
- 1,2, 3 and 4
- 1,2 and 3
- 2,3 and 4
- 1 and 4
- In maize (Zea mays) fertilization takes place between a female parent having colourless endosperm and the male parent having yellow endosperm. After fertilization, the endosperm of the new seed becomes yellow. This phenomenon is known as
- Dominance
- Xenia
- Met xenia
- Paternal influence
- In which one of the following sets of plants is the endosperm chlorophyll us?
- Rosa, Prunus
- Crinum, Raphanus
- Arachis, Cicer
- Linum, Olea
- Dichogamy refers to
- Male and female sex organs maturing at the same time
- Male and female sex organs maturing at different times
- Male sterility
- Female sterility
- If a leaf cell of gymnosperm plant had 24 chromosomes, then its endosperm cell would contain
- 24 chromosomes
- 36 chromosomes
- 12 chromosomes
- 48 chromosomes
- The main advantage of vegetative propagation is that it
- Is quit easy
- Is reliable
- Produces genetically uniform progeny
- Produces healthy, disease resistant plants
- Absence of sexual union and failure of meiosis is called
- Anisospory
- Amphimixis
- Apomixis
- Anisogamety
- In germinating oil seeds beta-oxidation of free fatty acids takes place in the
- Oleosomes
- Glyoxysomes
- Mitochondria
- Lysosomes