RL BIO 1 Flashcards
●Coconut milk factor is:
Cytokinin
●Which element increases the absorption of water andcalcium in plants?
Boron
●Which wood will become useless soon after exposingin the open air?
Wet Wood
●The cross-section of a stem of tree has fifty rings.What is the age of the tree?
50 years
●Onion is a modified form of:
Stem
●The pollination of maize takes place by:
Pollinationby air
●The age of trees is determined by its:
growth rings
●Fruits of this plant are found underground:
Groundnut
●Clove, the commonly used spice, is obtained from the:
Flower bud
●Maximum photosynthetic activity occurs in:
Blueand Red region of light
●Where is the Botanical Survey of Indiaheadquartered?
Kolkata
●Oxygen liberated during photosynthesis is comingfrom:
Water
●During photosynthesis the liberated gas is:
Oxygen
●Water in plants is transported by:
Xylem
●Where are the Eucalyptus trees found in abundance?
Nilgiri Hills
●Clove, the commonly-used spice, is obtained fromthe:
Flower-bud
●Hashish is obtained from a plant. From which part ofthe plant is it obtained?
Exudates from leavesand female inflorescences
●The chemical used for destroying Fungi in watertanks is:
Copper Sulphate
●The source of oxygen generated duringphotosynthesis is:
Water
●Which components of light are absorbed bychlorophyll?
Violet and Red
●Ginger is a stem and not a root because:
It hasnodes and inter-nodes
●Eyes of potato are useful for:
Vegetativepropagation
●What is not a component of chlorophyll?
Calcium
●Carrot is orange in colour because:
It containscarotene
●What is true regarding plant cells and animal cells?
Plant cells contain chloroplast while animalcells do not
●Silk is obtained from:
Saliva of the silk worm
●The seeds of certain plants fall to germinate if they donot pass through the digestive tract of fruit-eatingbirds. This is due to:
Seed coat impermeability
●Sucrose content in sugarcane decreases:
If frostoccurs during the period of ripening
●During photosynthesis green plants absorb:
Carbon dioxide
●Through ‘Photosynthesis’ green plants generate:
Organic materials
●Ripe grapes contain:
Fructose
●The age of a tree can be determined more or lessaccurately by:
counting the number of rings inthe trunk
●The sweetest sugar is
Fructose
●Maximum harm to a tree is caused by:
loss of allleaves
●Mineral constituent of chlorophyll is:
Magnesium
●Chewing gum is made from:
Latex
●After fertilization the zygote of a seed plant becomes:
Embryo
●The annular and spirally thickened conductingelements generally developed in the protoxylemwhen the root or stem is:
Differentiating
●Cell elongation in inter-nodal regions of the greenplants takes place due to:
Gibberellins
●Phototropic and geotropic movements in plants havebeen traced to be linked with:
Auxin
●The first case of polyembryony was reported incertain orange seeds by:
Antoni VanLeeuwenhoek
In a seed plant the microspore gives rise to the:
Pollen grain
●When the concentration of the soil solutes is low, theabsorption of water is:
increased
●Nuclear spindle consists of three types of fibres:
interzonal, continuous and discontinuous
●What carries a message from DNA in the nucleus tothe ribosomes in the cytoplasm?
m-RNA
●A pine seed has cotyledons and tissue from the:
Female gametophyte
●In a flower, which terminal structure is part of astamen?
Anther
●Which acid is a derivative of carotenoids?
Abscisicacid
●Phototropic curvature is the result of unevendistribution of:
Auxin
●Which is a gaseous plant hormone?
Ethylene
●Antheridia and Archegonia are sex organs of:
Moss
●In which group would you place a plant whichproduces seeds but lacks flowers?
Gymnosperms
●In glasshouses (green houses) when plants are kept onartificial light and temperature, the method iscalled:
phytotron
●Natural cytokinin are synthesized in tissues that are:
dividing rapidly
●With regard to photorespiration in plants, the correctstatement is:
It occurs in chloroplasts
●In a plant organ, which is covered by periderm andthe stomata are absent, some gaseous exchangestill takes place through:
Lenticels
●The carbohydrates synthesized in the leaves aretransported through sieve tubes most commonlyin the form of:
Sucrose
●Best defined function of Manganese in green plantsis:
Photolysis of water
●Stomata open is due to accumulation of:
K
●When pea seeds and wheat grains are soaked inwater, pea seeds showed more swelling than thewheat. The reason is:
Imbibitions capacity ofproteins is more than that of starch
●Which denotes the water potential of the mesophyllcell in wilted condition?
Equal to the value ofosmotic potential
●Which minerals activate the enzymes involved inrespiration?
Magnesium and manganese
●The minerals involved in water-splitting reactionduring photosynthesis are:
Manganese andChlorine
●A nutritionally wild type organism, which does notrequire any additional growth supplement isknown as:
Prototroph
●Humidity in atmosphere decreases rate of:
Transpiration
●Guttation is the result of:
Root pressure
●Hydathodes are also called:
water stomata
●The sugarcane Plant has:
dumb bell-shaped guardcells
●If water enters in a cell, the pressure exerted by itsswollen protoplast is:
Turgor pressure
●What is the most accepted theory for movement ofwater through plants?
Cohesion theory
●With an increase in the turgidity of a cell, the wallpressure will:
increase
●Opening and closing of stomata is due to the:
Change in Turgor pressure of guard cells
●Water will be absorbed by root hair when:
concentration of solutes in the cell sap is high
●Little leaf is caused due to the deficiency of:
Zinc
●Mineral salts which are absorbed by the roots fromsoil are in the form of:
Very dilute solution
●Most plants obtain their nitrogen from the soil in theform of:
Nitrates
●Nitrogen fixing bacteria were discovered by:
Winogradsky
●Non-legume nitrogen fixing organisms belongs togenus:
Franken
●In root nodules of legumes, leg-haemoglobin isimportant because it:
Acts as an oxygenscavenger
●A rootless aquatic plant in which a portion of the leafforms a tiny sac for trapping insects, is
Utricularia
●If by radiation all nitrogenase enzymes areinactivated, then there will be no:
Fixation ofnitrogen in legumes
●In soil, water available for plants is:
Capillarywater
●The ratio between 2-carbon and 3-carbonintermediates having
NH2 group formed inphotosynthetic oxidation cycle is: 2:1
●In higher plants, continuity of cytoplasm from onecell to its neighbouring cells is establishedthrough:
Symplast
●The amount of water held by the soil after drainage isknown as:
Field capacity
●Attraction of water molecules to polar surfaces isknown as:
Adhesion
●When the conditions are dry, a grass leaf curlsinward to minimize water loss due to presence of:
Bulliform cells
●Both photosynthesis and respiration require:
Cytochromes
●Wilting of a plant results from excessive:
transpiration
●The phytohormone, which increases theconcentration of potassium in guard cells is alsoresponsible for the induction of:
cell division
●Potometer works on the principle of:
Amount ofwater absorbed equals the amount transpired
●According to Steward’s starch hydrolysis theory,which is the principal reason for the opening ofstomata during daytime?
Photosyntheticutilization of CO2 in guard cells
●Cohesion theory of water movement in plants was putforth by:
Henry Dixon
●Which force is responsible for raising water up to 100m of tall plants?
Transpiration pull
●The first process by which water enters into the seedcoat when a seed is placed in suitable environmentfor germination is:
Imbibition
●Opening of floral buds into flowers, is a type of:
Autonomic movement of growth
●In a flowering plants megaspore undergoes mitosisand develops into a:
Seed
●The importance of day length in flowering of plantswas first shown in:
Tobacco
●The assimilatory power i.e., NADPH2 and ATP areformed in light or:
Hill’s reaction
●A fresh water green alga, rich in protein is:
Chlorella
●Compared with the gametophytes of the bryophytesthe gametophytes of vascular plants tend to be:
Smaller and to have smaller sex organs
●Differentiation of shoot is controlled by:
Highcytokinin : auxin ratio
●Corn and beans are often cited as representativeexamples of _____, respectively.
Monocots anddicots
●Gymnosperms produce neither flower nor fruitbecause they do not possess:
Ovary
●In a flower, ______ generally consist of two pollensacs.
Anthers
●An enzyme that can stimulate germination of barleyseeds is:
á-amylase
●Seed dormancy is due to:
Abscisic acid
●Heparin is secreted by:
Mast Cells
●Interdependent genes with related functions form:
A co-adapted gene complex
●The major constituent of vertebrate bone is:
Calcium phosphate
●Animals do not have enzyme systems which enablethem to make use of the energy from:
Water
●A clone is a colony of:
cells having similar geneticconstitution
●Which of the following is the largest living bird?
Ostrich
●In the case of test tube babies:
embryo is placed inuterus after 2 months
●A rare and endangered animal in Silent Valley is:
Lion-tailed Macaque
●AIDS virus has:
double stranded DNA
●Anglo-Nubian is a breed of:
Goat
●Which blood group is a universal recipient?
AB
●Rod shaped bacteria is called:
Bacillus
