NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Botany MCQs (Practice_Test 87 of 104)
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- In a water molecule, hydrogen bonding is possible because oxygen has
- No free electron pairs
- Two free lone pairs of electron
- Four free long pairs of electron
- Six free lone pairs of electron
- ‘Gray speck’ of oat is due to the deficiency of
- Manganese
- Molybdenum
- Magnesium
- Zinc
- Critical toxicity level caused by mineral nutrients means reduction in weight of plant tissue by
- 5%
- 10%
- 20%
- 25%
- Active transport of solutes in a living system is
- Unidirectional
- Bidirectional
- Multidirectional
- Cyclic
- The m-RNA molecule is synthesized from the DNA by the RNA-polymerase by reading the
- Cooling strand in the 3 ‘5’ direction
- Cooling strand in the 5 ‘3’ direction
- Ant coding strand in the 3 ‘5’ direction
- Ant coding strand in the 5 ‘3’ direction
- Smudge in certain colored varieties of onions is prevented by
- Fumaric acid
- Ferulic acid
- Chlorogenic acid
- Protocateuchuic acid
- Trifolirhizin, a phytoalexin has been reported from
- Soybean roots
- Red clover roots
- Bean pods
- Pea pods
- The amino acids which are formed by a route common to phenolic compounds are
- Lysine and glycine
- Lucien and isoleucine
- Methionine and valine
- Phenylalanine and tyrosine
- The first alkaloid to be isolated and crystallized was
- Nicotine
- Quinine
- Morphine
- Colchicines
- Pruning of hedge is practiced to
- Keep the plants short
- Promote better growth of the shoots
- Promote lateral branching
- Prevent flowering
- Phototonus is a facility to
- Grow disease-free plants
- Grow plants under controlled conditions
- Micro propagate plants
- Conserve endangered plants
- Which one of the following wavelengths is most effective for the photo morphogenetic phenomenon
- 730 nm
- 680 nm
- 660 nm
- 560 nm
- Which one of the following plants exhibits monopole germination of embryo?
- Cuscuta
- Mistletoe
- Carrot
- Sandalvood
- Virus-free clonal plants can be produced
- From cuttings
- By anther culture
- By shoot-tip culture
- By micro propagation
- In angiosperms, the egg is
- Completely surrounded by a wall
- Surrounded by a wall only at the micropylar end
- Surrounded by a wall only at the chalazae end
- Devoid of wall