Biology GK · all questions

Plant Anatomy and Physiology
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Q681

Consider the following statements.
1. Sweet orange plant is propagated by grafting technique.
2. Jasmine plant is propagated by layering technique.
Which of the statement (s) given above is/are correct?

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Q682

The mechanism by which the genetic constitution of a plant influences parthenocarpic development is due to the change in the

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Q683

The indirect ecological factors include

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Q684

Which one of the following will happen if the medium surrounding the cell has a higher concentration than the cell?

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Q685

Consider the following statements regarding hormones.
1. It is an organic compound which control the growth of plant.
2. It is special kind of organic compound found in small amount which control metabolic activity and growth of plant.
3. Its different concentration produce different organs.
Which of the statements given above is/are true about hormones ?

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Q686

The oxygen evolved during photosynthesis comes from splitting of

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Q687

According to Wareing, bud dormancy in woody species is a photoperiodic phenomenon that is

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Q688

Which of the following blocks the "Hill reaction" in photosynthesis thus killing the plant by closing down food production?

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Q689

The resultant amount of energy stored in the tissue of heterotrophs is termed as

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Q690

Sevetal major factors that indicate that cytokinins interact directly with nucleic acids include

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Q691

As a rule, which of the following is/are destroyed by the impact of the pollen tube and the others remain intact until some time afterward?

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Q692

Consider the following statements and choose the correct answer:
1. The waters of estuaries are among most naturally fertile in the world
2. The high productivity in estuaries is brought about by the action of tides, which promote a rapid circulation of nutrients and aid in the removal of waste products
3. "Mariculture" is done in the oyster farms of Japan where oysters are grown suspended on rafts hanging from floats
4. Estuaries and marshes are among the ecologic regions of the world that are most seriously threatened by human activities

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Q693

On receiving the required light energy, a chlorophyll molecule gets changed from ground state to excited state. This activated state is called

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Q694

Oxidised from of nicotinamide adenine dinucleotide is commonly abbreviated as

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Q695

The plants growing only in alkaline soil are known as

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Q696

Old name for NADP was

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Q697

How is the nitrogen taken up by the plants?
1. In the form of inorganic nitrates of nitrites.
2. In the form of organic compounds.
3. Directly taken up from the atmosphere.

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Q698

Which law of thermodynamics states that whenever energy is transformed from one kind to another, there is an increase in entropy and a decrease in the amount of useful energy?

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Q699

Generally a plant community is determined by

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Q700

Plants get water through the roots because of

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