Description : . Submerged weed a). Hydrilla verticillata b). Nagar sp c). Utricularia stellaris d). All of these
Last Answer : d). All of these
Description : The weed propagated through rhizomes/ root stock a). Agropyron repens b). Cynodon dactylon c). Typha angustata d). All of these
Description : In ginger, vegetative propagation occurs through (a) bulbils (b) runners (c) rhizome (d) offsets.
Last Answer : (c) rhizome
Description : The donor plants release allelochemicals in the immediate environment as a). volatiles b). root exudates c). microbial decomposition products d). All
Last Answer : d). All
Description : Root exudates of wheat and oats which has detrimental effects on wild mustard con tain a). Phenolic acid b). Alkaloids c). Sulphides d). Lactones
Last Answer : a). Phenolic acid
Description : . Klamath weed (Hypericum perforatum) is controlled by an insect a). Chrysolina hyperici (Beetle) b). Chrysolina gamellata (Beetle) c). Agrilus hyperici (Root borer) d). All of these
Description : Growth of the weed is reduced due to root exudates of maize a). Chenopodium album b). Amaranthus retroflexus c). Both a and b d). None of these
Last Answer : c). Both a and b
Description : An alternate host of root knot nematode in vegetables a). Brassica kaber b). Cleome viscosa c). Carthamus oxyacantha d). All of these
Description : Devine produce lethal root and collar rot in a).Velvet leaf b). Joint vetch c). Strangler wine d). Dodder
Last Answer : c). Strangler wine
Description : .Phenolic acid as root exudates of which crop has detrimental effects on wild mustard? a). Wheat b). Oats c). Chickpea d). a & b
Last Answer : d). a & b
Description : .Strigol, a witch weed stimulant isolated from the root exudates of a). Cotton b). Sorghum c). Alfaalfa d). Cowpea
Last Answer : a). Cotton
Description : Root exudates of which crop has allelo pathic effect on Chenopodium album? a). Wheat b). Oat c). Pea d). All
Description : A systemic pesticide ? a). kills anything it touches b). root absorbed c). Root/shoot absorbed & translocative d). shoot absorbed
Last Answer : c). Root/shoot absorbed & translocative
Description : The mode of action of Isoproturon is a). Root inhibitor b). Shoot inhibitor c). Photosynthesis inhibition d). Amino acid inhibition
Last Answer : c). Photosynthesis inhibition
Description : Which herbicide’s mode of action is root growth inhibition? a). Fluchloralin b). MCPA c). Glyphosate d). Alachlor
Last Answer : d). Alachlor
Description : The mode of action of dinitroanilines a). Shoot growth inhibitor b). Lipid inhibitor c). Root growth inhibitor d). Amino acid inhibitor
Last Answer : c). Root growth inhibitor
Description : What is the mode of action of diclofop a). Root inhibition b). Shoot inhibition c). lipid inhibition d). Photosynthesis inhibition
Last Answer : c). lipid inhibition
Description : Characters of bulbils. Give example. -Biology
Last Answer : answer:
Description : Bulbils takes part in - (1) Sexual reproduction (2) Vegetative reproduction (3) Food storage (4) Respiration
Last Answer : (2) Vegetative reproduction Explanation: Bulbil is a small bulblike organ of vegetative re-production growing in leaf axils or on flower stalks of plants such as the onion and tiger lily. It is a ... from the parent plant on to the ground, give out adventitious roots and develop into new plants.
Description : Vegetative reproduction of Agave occurs through (a) rhizome (b) stolon (c) bulbils (d) sucker.
Last Answer : (c) bulbils
Description : Which one of the following pairs is wrongly matched while the remaining three are correct? (a) Penicillium – Conidia (b) Water hyacinth – Runner (c) Bryophyllum – Leaf buds (d) Agave – Bulbils
Last Answer : (b) Water hyacinth – Runner
Description : Bulbils takes part in (1) Sexual reproduction (2) Vegetative reproduction (3) Food storage (4) Respiration
Last Answer : Vegetative reproduction
Description : what is a Hydrilla plant -Biology
Description : What is Hydrilla ?
Last Answer : Fresh aquatic plants are called hydrala.
Description : Which angiosperm is vessel-less? (1) Hydrilla (2) Trochodendron (3) Maize (4) Wheat
Last Answer : (1) Hydrilla Explanation: Trochodendron is a genus of flowering plants with one living species. It is vesselless angiosperm. Fewer than 200 species of angiosperms have the primitive ... With two exceptions- Trochodendron and Tetracentron-, all vesselless angiosperms occur in the Magnoliidae.
Description : The correct sequence of plants in a hydrosere is (a) Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak (b) Pistia → Volvox → Scirpus → Hydrilla → Oak → Lantana (c) Oak → Lantana → Volvox → Hydrilla → Pistia → Scirpus (d) Oak → Lantana → Scirpus → Pistia → Hydrilla → Volvox.
Last Answer : (a) Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak
Description : In which of the following plant sunken stomata are found? (a) Nerium (b) Hydrilla (c) Mango (d) Guava
Last Answer : (a) Nerium
Description : Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other? (a) Hydrilla (b) Yucca (c) Banana (d) Viola
Last Answer : (b) Yucca
Description : Which one of the following is a xerophytic plant in which the stem is modified into the flat green and succulent structure? (a) Opuntia (b) Casuarina (c) Hydrilla (d) Acacia
Last Answer : (a) Opuntia
Description : Flagellated male gametes are present in all the three of which one of the following sets? (a) Zygnema, Saprolegnia and Hydrilla (b) Fucus, Marsilea and Calotropis (c) Riccia, Dryopteris and Cycas (d) Anthoceros, Funaria and Spirogyra
Last Answer : (c) Riccia, Dryopteris and Cycas
Description : 9.In a pond there were 20 hydrilla plants .Through reproduction 10 new hydrilla plants were added in a year .What will be the birth rate of the plant
Last Answer : Ans-Birth rate = No of individuals born = 10 = 0.5 Total number of individuals 20
Description : Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other? (1) Hydrilla (2) Yucca (3) Banana (4) Viola
Last Answer : (2) Yucca
Description : Water blooms are formed by a) Lemna b) Hydrilla c) Water hyacinth d) Planktonic algae.
Last Answer : d) Planktonic algae.
Description : Which angiosperm is vesselless ? (1) Hydrilla (2) Trochodendron (3) Maize (4) Wheat
Last Answer : Trochodendron
Description : In a 100 quadrat study of 1 sqm each Cyperus rotundus was found in 80 quadrats with overall of 5640 individuals. The frequency (%), abun dance and density (m2) would be a). 70.5, 80.0 and 56.4 b). 56.4, 70.5 and 80.0 c). 80.0, 70.5 and 56.4 d). 80.0, 56.4 and 70.5
Last Answer : c). 80.0, 70.5 and 56.4
Description : If Echinochloa falls in frequency class ‘E’, the weed community is said to be a). Contiguous b). Heterogenous c). Homogenous d). Random
Last Answer : c). Homogenous
Description : Out of 50 quadrats studied, if Echinochloa is found in 26 quadrats, its frequency of occurrence would be a). 13% b). 26% c). 52% d). 68%
Last Answer : c). 52%
Description : If weed population is 70/m2 and the crop 140/ m2, weed intensity would be a). 33.3% b). 66.6% c). 50% d). 73.4%
Last Answer : a). 33.3%
Description : If the count of Echinochloa in weedy check is 70 and that in a treatment 25/m2, weed control efficiency will be a). 54.3% b). 64.3% c). 73.4% d). 79.6%
Last Answer : b). 64.3%
Description : If the yield from weed free is 3500 kg and that from weedy 1500 kg/ha, weed index would be a). 57.1% b). 133.3% c). 45.0% d). 25.6%
Last Answer : a). 57.1%
Description : If the gross returns from an enterprise are INR 30000 and the net returns INR 20000, the benefit cost ratio based on net gain would be a). 3.0 b). 2.0 c). 1.0 d). 1.5
Last Answer : b). 2.0
Description : The cost of any activity measured in terms of the value of the next best alternative forgone a). Economic cost b). Variable cost c). Opportunity cost d). Marginal cost
Last Answer : c). Opportunity cost
Description : A cost independent of the quantity of goods and services produced a). Variable cost b). Fixed cost c). Opportunity cost d). Marginal cos
Last Answer : b). Fixed cost
Description : The additional cost from taking a cost of action is called a). Total cost b). Opportunity cost c). Variable cost d). Marginal cost
Last Answer : d). Marginal cost
Description : Marginal cost is defined as____ a). Cost that arises when the quantity produced changes by one unit b). Cost of producing one more unit of a good c). Increase in cost that accompanies a unit in crease in output d). All the above
Last Answer : d). All the above
Description : Economic cost is the sum of________ a). Variable and fixed costs b). Variable, fixed and opportunity costs c). Fixed and opportunity costs d). Variable, fixed and marginal costs
Last Answer : b). Variable, fixed and opportunity costs
Description : . A ceremonial weed a). Cynodon dactylon b). Datura stramonium c). Tagetus sp d). All of these
Description : A ceremonial weed a). Asparagus racemosus (Shatawari) b). Cynodon dactylon (Dhoob ghaas) c). Nelumbo nucifera (Lotus flower) d). All of these
Description : A ceremonial weed a). Asparagus racemosus (Shatawari) b). Cynodon dactylon (Dhoob ghaas) c). Both a and b d). Digitaria sanguinalis