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Flower which have single ovule in the ov...

Flower which have single ovule in the ovary and are packed into inflorescence are usually polinated by

A

(A) Bat

B

(B) Water

C

(C ) Bee

D

(D) Wind

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The correct Answer is:
D
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MULTIPLE CHOICE QUESTIONS (MCQs): Plants with ovaries having only one or a few ovules, are generally pollinated by :

Read the given passage and answers following questions : A catalytic process in which the catalyst and the reactants are present in different phases is known as a heterogeneous catalysis. This heterogeneous catalytic action can be explained in terms of the adsorption theory. The mechanism of catalysis involves the following steps: (i) Adsorption of reactant molecules on the catalyst surface. (ii) Occurrence of a chemical reaction through the formation of an intermediate. (iii) De-sorption of products from the catalyst surface (iv) Diffusion of products away from the catalyst surface. In this process, the reactants are usually present in the gaseous state and the catalyst is present in the solid state. Gaseous molecules are then adsorbed on the surface of the catalyst. As the concentration of reactants on the surface of the catalyst increases, the rate of reaction also increases. In such reactions, the products have very less affinity for the catalyst and are quickly desorbed, thereby making the surface free for other reactants. Which theory explains heterogeneous catalytic action?

Read the given passage and answers following questions : A catalytic process in which the catalyst and the reactants are present in different phases is known as a heterogeneous catalysis. This heterogeneous catalytic action can be explained in terms of the adsorption theory. The mechanism of catalysis involves the following steps: (i) Adsorption of reactant molecules on the catalyst surface. (ii) Occurrence of a chemical reaction through the formation of an intermediate. (iii) De-sorption of products from the catalyst surface (iv) Diffusion of products away from the catalyst surface. In this process, the reactants are usually present in the gaseous state and the catalyst is present in the solid state. Gaseous molecules are then adsorbed on the surface of the catalyst. As the concentration of reactants on the surface of the catalyst increases, the rate of reaction also increases. In such reactions, the products have very less affinity for the catalyst and are quickly desorbed, thereby making the surface free for other reactants. How many steps involved in mechanism of catalysis ?

Read the given passage and answers following questions : A catalytic process in which the catalyst and the reactants are present in different phases is known as a heterogeneous catalysis. This heterogeneous catalytic action can be explained in terms of the adsorption theory. The mechanism of catalysis involves the following steps: (i) Adsorption of reactant molecules on the catalyst surface. (ii) Occurrence of a chemical reaction through the formation of an intermediate. (iii) De-sorption of products from the catalyst surface (iv) Diffusion of products away from the catalyst surface. In this process, the reactants are usually present in the gaseous state and the catalyst is present in the solid state. Gaseous molecules are then adsorbed on the surface of the catalyst. As the concentration of reactants on the surface of the catalyst increases, the rate of reaction also increases. In such reactions, the products have very less affinity for the catalyst and are quickly desorbed, thereby making the surface free for other reactants. What is heterogeneous catalysis.

Read the given passage and answers following questions : A catalytic process in which the catalyst and the reactants are present in different phases is known as a heterogeneous catalysis. This heterogeneous catalytic action can be explained in terms of the adsorption theory. The mechanism of catalysis involves the following steps: (i) Adsorption of reactant molecules on the catalyst surface. (ii) Occurrence of a chemical reaction through the formation of an intermediate. (iii) De-sorption of products from the catalyst surface (iv) Diffusion of products away from the catalyst surface. In this process, the reactants are usually present in the gaseous state and the catalyst is present in the solid state. Gaseous molecules are then adsorbed on the surface of the catalyst. As the concentration of reactants on the surface of the catalyst increases, the rate of reaction also increases. In such reactions, the products have very less affinity for the catalyst and are quickly desorbed, thereby making the surface free for other reactants. What is diffusion ?

In which part of a flower, you are likely to find the ovary?

The statements given below describe certain features that are observed in the pistil of flowers. Pistil may have many carpels Each carpel may have more than one ovule. Each carpel has only one ovule. Pistil have only one carpel. Choose the statements that are true from options

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : (a) Draw a diagrammatic sectional view of a mature anatropous ovule and label the following parts in it: (i) that develops into seed coat. (ii) that develops into an embryo after fertilization. (iii) that develops into an endosperm in an albuminous seed. (iv) through which the pollen tube gains entry into the embryo sac. (v) that attaches the ovule to the placenta (b) Describe the characteristic features of wind pollinated flowers.

JMD PUBLICATION-Sexual Reproduction in Flowering Plants-Exercises
  1. Attractants and rewards are required for

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  2. Functional megaspore in an angiosperm develops into

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  3. Flower which have single ovule in the ovary and are packed into inflor...

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  4. Which one of the following plants shows a very close relationship with...

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  5. Double fertilization is

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  6. Which of the following has proved helpful in preserving pollen as foss...

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  7. Pollen grains can be stored for several years in liquid nitrogen havin...

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  8. To obtain seedless watermelon, which among the following method is fol...

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  9. Which of the following group does not represent monocot, Apicot mango,...

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  10. Polidy level of Nucellus, endosperm, polar nuclei, Megaspore mother c...

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  11. Which of the following is false fruit?

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  12. In some plants, the female gamete develops into embryo without fertili...

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  13. Which of the following statesments regarding post fertilization develo...

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  14. Due to increasing air-borne allergens and pollutants many people in ur...

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  15. What is the fate of the male gametes discharged in the synergid?

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  16. Persistent nucellus in the seed is known as :

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  17. The process of removal of anther from the flower bud before it dehisce...

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  18. Which of the following is not found on maize seed ?

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  19. Fill in the blanks Rearing flower is called as .

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  20. Fill in the blanks The long and slender stalk of stamen is .

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