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Consider the following four statements ...

Consider the following four statements
A)The sporophyte in liverworts is more elaborate than that in mosses
B) Salvinia is heterosporous
C) The life-cycle in all seed-bearing plants is diplontic
D) In Pinus male and female cones are borne on different trees
The two wrong statements together are

A

A and C

B

A and D

C

B and C

D

A and B

Text Solution

Verified by Experts

The correct Answer is:
B
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The necessary condition for a molecule to exhibit optical isomerism is dissymmetry or chiral. Thus all organic compounds which contain one as symetric carbon atom are chiral and exist in two stereoisomers. Although the two forms have the same structure, they have different arrangements of groups about the as symmetric carbon. In fact, they represent as symetric molecules. They do not have a plane of symmetry. They are related to each other as an object to its mirror image and are non superimposable. The two structures actually stand for dextro or (+) and leavo or (-) isomers. Since they are related each other as mirror images, they are commonly called enantiomers. Consider the following structures A,B,C,D Which of the following statements is not correct

AAKASH SERIES-PLANT KINGDOM-EXERCISE-III
  1. Which one of the following is similar character for E.coli and Chlamyd...

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  2. Cycas and Cicer resemble each other in having

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  3. Which one of the following is correctly matched?

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  4. Eustele is present in

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  5. Which one of the following pairs is wrongly matched?

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  6. Consider the following four statements A)The sporophyte in liverwort...

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  7. Selaginella and Salvinia are considered to reprsent a significant step...

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  8. Which one of the following plants is monoecious ?

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  9. Which one of the following has haplontic life cycle?

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  10. Which one of the following is a vascular cryptogam?

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  11. Which one of the following is considered important in the development ...

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  12. In which one of the following male and female gametophytes do not have...

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  13. Spore dissemination in some liverworts is aided by

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  14. Peat moss is used as a packing material for sending flowers and live p...

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  15. Ectophloic siphonostele is found in

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  16. Which one of the following pairs of plants are not seed producers?

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  17. Plants reproducing by spores such as mosses and ferns are grouped unde...

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  18. Which of the following plants produces seeds but not true flowers ?

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  19. Cycas has two cotyledons but not included in angiosperms because of

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  20. Plant group with largest ovule, largest tree and largest gametes is

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