Description : What is Hydrilla ?
Last Answer : Fresh aquatic plants are called hydrala.
Description : Assertion: Presence of large amounts of nutrients in water body causes excessive growth of planktonic algae. Reason : It is due to biomagnifications
Last Answer : Assertion: Presence of large amounts of nutrients in water body causes excessive growth of planktonic algae. ... but reason is wrong D. Both are wrong
Description : Blue-green alga that causes red blooms is: (a) Anabaena (b) Gleacapsa (c) Trichodesmium (d) Nostoc
Last Answer : Ans. ((c))
Description : Thermal algae can live in: (a) Saline soil (b) Hot water streams of 70°C (C) Deserts (d) Snow balls
Last Answer : Ans. ((b))
Description : What kind of plant is algae ?
Last Answer : Algae is an autotrophic plant.
Description : Sporocarp is a reproductive structure of (a) Some algae (b) Some aquatic ferns (c) Angiosperms having spores (d) Bryophytes
Description : Golgi apparatus is absent in (a) Higher plants (b) Yeast (c) Bacteria and blue-green algae (d) Liver cells
Description : The pioneers of succession on terrestrial habitats are a. Higher plants b. Lichens c. Mosses d. Algae
Last Answer : b. Lichens
Description : Green house effect is related to a) Increased growth of green algae b) Global warming c) Cultivation of vegetables in house
Last Answer : b) Global warming
Description : Importance of day length in flowering of plants was first shown in (a) cotton (b) Petunia (c) Lemna (d) tobacco.
Last Answer : (d) tobacco.
Description : _____ bacteria live as individuals and do not live in biofilms. a. Planktonic b. Anaerobic c. Aerobic d. Facultative anaerobic
Last Answer : a. Planktonic
Description : Scientific study of plant Pollen, spores and certain microscopic planktonic organism is called —
Last Answer : Palynology
Description : What causes blue-green algae blooms? -Biology
Last Answer : answer:
Description : How can blue-green algae blooms be treated? -Biology
Description : Consider the following statement: (1) In plant cells, cytokinesis start with the formation of the phragmoplast (2) Phragmoplast comprises intrazonal microtubules and Golgi vesicles (3) Primary cell wall is produced by microtubules (4) Phragmoplast is formed by nucleus
Last Answer : Ans. ((a))
Description : The archesporium of ovule is (a) Single celled terminal (b) Single celled central (c) Single celled hypodermal (d) Single celled lateral Ans. (c) ..................... ... formed after one fertilization (3) Seed is formed before double fertilization (4) Fruit is produced after double fertilization
Description : When many islands of phloem embedded in xylem layer due to anomalous activity of cambium are formed such phloems are known as
Last Answer : When many islands of phloem embedded in xylem layer due to anomalous activity of cambium are formed such phloems are known as – Included phloem
Description : When the diploid embryosac is formed from the cells of nucellus, it is known as
Last Answer : When the diploid embryosac is formed from the cells of nucellus, it is known as – Apospory
Description : When a diploid embryosac is formed from a megaspore mother cell without meiosis, it is called as
Last Answer : When a diploid embryosac is formed from a megaspore mother cell without meiosis, it is called as – Diplospory
Description : The process where, plants are propagated by seeds, but the embryo is formed by the process in which normal meiosis and syngamy has been eliminated is called
Last Answer : The process where, plants are propagated by seeds, but the embryo is formed by the process in which normal meiosis and syngamy has been eliminated is called – Agamospermy
Description : Where do you find protoxylem lacuna? How are they formed?
Last Answer : Ans: They are found in the vascular bundles of monocot stem. They are formed due to crushing of protoxylem vessels during the course of development.
Description : Coacervates were formed by a) DNA b) Radiations c) Polymerization d) Polymerisation and aggregation
Last Answer : d) Polymerisation and aggregation
Description : what is a Hydrilla plant -Biology
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 : . Submerged weed a). Hydrilla verticillata b). Nagar sp c). Utricularia stellaris d). All of these
Last Answer : d). All of these
Description : . Hydrilla verticillata is propagated by a). Root stocks b). Runners c). Turions d). Bulbils
Last Answer : c). Turions
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 : Which angiosperm is vesselless ? (1) Hydrilla (2) Trochodendron (3) Maize (4) Wheat
Last Answer : Trochodendron
Description : What kind of stem can be seen in water hyacinth ?
Last Answer : Offset stems can be seen in water hyacinth.
Description : How to see water hyacinth flowers ?
Last Answer : Small and light in the form of water-pollinated flowers.
Last Answer : : In the late nineteenth century, an orchid-loving tourist liked water hyacinth flowers so much that he brought them with him when he came to this country from Brazil. Roar Bengali
Last Answer : The answer is a joke ...
Last Answer : : There is a lot of air chamber between the stalk and leaves of Kachuri drink which is why it floats in water.
Description : The rapidly growing mass of phytoplankton coveting the surface water of a lake or pond is known as – (1) Eutrophication (2) Water bloom (3) Water pollution (4) Water hyacinth
Last Answer : (1) Eutrophication Explanation: Eutrophication is the ecosystem response to the addition of artificial or natural substances, such as nitrates and phosphates, through fertilizers or sewage, to an aquatic ... increase of phytoplankton in a water body as a response to increased levels of nutrients.
Description : Which of the following weeds has been found effective in checking water pollution caused by industrial affluents? (1) Water hyacinth (2) Elephant Grass (3) Parthenium (4) Both (2) and (3)
Last Answer : (1) Water hyacinth Explanation: Plants that are resistant to crude oil toxicity such as black poplar and willows, as well as miscanthus grass (elephant grass) have been found to ... oliefera seeds and Parthenium hysterophorus plants are effective for the removal of industrial p011utants in water.
Description : Which of the following weeds has been found useful to check water pollution caused by industrial effluents? (1) Partheniurn (2) Elephant grass (3) Water hyacinth (4) Both (1) and (2)
Last Answer : (4) Both (1) and (2) Explanation: Parthenium and Elephant grass are useful to check water pollution caused by industrial effluents.
Description : Which of the following weeds has been found useful to check water pollution caused by industrial affluents? (1) Parthenium (2) Elephant grass (3) Water hyacinth (4) Both (1) and (2) above
Last Answer : (3) Water hyacinth Explanation: Around the world, there is an increasing trend in areas of land, surface waters and groundwater affected by contamination from industrial, military and agricultural activities due to either ignorance, lack of vision, or carelessness.
Description : Which one of the following pairs of organisms are exotic species introduced in India? (a) Lantana camara, water hyacinth (b) Water hyacinth, Prosopis cinereria (c) Nile perch, Ficus religiosa (d) Ficus religiosa, Lantana camara
Last Answer : (a) Lantana camara, water hyacinth
Description : Pollination in water hyacinth and water lily is brought about by the agency of (a) water (b) insects or wind (c) birds (d) bats.
Last Answer : b) insects or wind
Description : In water hyacinth and water lily, pollination takes place by (a) insects or wind (b) water currents only (c) wind and water (d) insects and water
Last Answer : (a) insects or wind
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 : Which of the following pairs is not correctly matched? Mode of reproduction Example (a) Binary fission Sargassum (b) Conidia Penicillium (c) Offset Water hyacinth (d) Rhizome Banana
Last Answer : a) Binary fission Sargassum
Description : Which one of the following statements is not correct? (a) Offspring produced by the asexual reproduction are called clone. (b) Microscopic, motile, asexual reproductive structures are called zoospores. ( ... in the standing water, drains oxygen from water that leads to the death of fishes.
Last Answer : (c) In potato, banana and ginger, the plantlets arise from the internodes present in the modified stem.