Recent questions tagged botany

Sickel cell anemia is :

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Given below is a schematic break-up of the phases / stages of cell cycle : Which one of the following is the correct indication of the stage / phase in the cell cycle ?

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The cell junctions called tight, adhering and gap junctions are found in :

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Cytoskeleton is made up of :

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Middle lamella is composed mainly of :

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Phylogenetic system of classification is based on:

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Which one of the following is a vascular cryptogram ?

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Mannitol is the stored food in -

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T.O.Diener discovered a :

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Which one of the following has haplontic life cycle ?

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Which one of the following pairs is wrongly matched ?

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Global agreement in specific control strategies to reduce the release of ozone depleting substances, was adopted by :

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DDT residues are rapidly passed through food chain causing biomagnification because DDT is :

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Biochemical Oxygen Demand (BOD) in a river water :

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Chipko movement was launched for the protection of -

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Montreal protocol aims at :

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Which one of the following has maximum genetic diversity in India ?

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Which one of the following types organisms occupy more than one trophic level in a pond ecosystem ?

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Which one of the following is considered important in the development of seed habit ?

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The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is -

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A fruit developed from hypanthodium inflorescence is called :

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Oxygenic photosynthesis occurs in :

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Manganese is required in :

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Guard cells help in :

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An example of a seed with endosperm, perisperm and caruncle is -

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Cotyledons and testa respectively are edible parts in -

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Point mutation involves :

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Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a "triplet" ?

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Semiconservative replication of DNA was first demonstrated in :

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Removal of introns and joining the exons in a defined order in a transcription unit is called :

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What is not true for genetic code?

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Synapsis occurs between :

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Stroma in the chloroplast of higher plant contains :

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Plasmodesmata are :

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The fleshy receptacle of syconus of fig encloses a number of:

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Importance of day length in flowering of plants was first shown in:

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Electrons from excited chlorophyll molecule of photosystem II are accepted first by:

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Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?

asked Jul 26, 2018 by pady_1

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Keeping in view the "fluid mosaic model" for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip- flop movement)?

asked Jul 26, 2018 by pady_1

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Which one of the following pairs of plant structures has haploid number of chromosomes?

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The energy-releasing process in which the substrate is oxidized without an external electron acceptor is called:

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Trichoderma harzianum has proved a useful microorganism for:

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Bacterial leaf blight of rice is caused by a species of:

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What does the filiform apparatus do at the entrance into ovule?

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Cellulose is the major component of cell walls of :

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Which one of the following is resistant to enzyme action?

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Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?

asked Jul 26, 2018 by pady_1

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The table below gives the populations (in thousands) of ten species (A-J) in four areas (a-d) consisting of the number of habitats given within brackets against each. Study the table and answer the question which follows: Area and Species, and their populations (in thousands) in Number areas of Habitats A B C D E F G H I J a (11) 2.3 1.2 0.52 6.0 - 3.1 1.1 9.0 - 10.3 b (11) 10.2 - 0.62 - 1.5 3.0 - 8.2 1.1 11.2 c (13) 11.3 0.9 0.48 2.4 1.4 4.2 0.8 8.4 2.2 4.1 d (12) 3.2 10.2 11.1 4.8 0.4 3.3 0.8 7.3 11.3 2.1 Which area out of a to d shows maximum species diversity?

asked Jul 26, 2018 by pady_1

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A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this? (i) Lots of urea and phosphate fertilizer were used in the crops in the vicinity (ii) the area was sprayed with DDT by an aircraft (iii) The lake water turned green and stinky (iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis Which two of the above were the main causes of fish mortality in the lake?

asked Jul 26, 2018 by pady_1

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Which one of the following proved effective for biological control of nematodal disese in plants?

asked Jul 26, 2018 by pady_1

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