Biology : Morphology of Flowering Plants

Cut surfaces of fruit and vegetables often become dark because

• dirty knife makes it dark

• oxidation of tannic acid in the presence of trace of iron from the knife makes it dark

• dust of the air makes it dark

• none of the above.

Ectophloic siphonostele is found in

• Osmunda and Equisetum

• Marsilea and Botrychium

• Adiantum and Cucurbitaceae

• Dicksonia and Maidenhair fern.

Composite fruit develops from

• single ovary

• inflorescence

• apocaropous ovary

• pericarp

Cocoa is the plant from which chocolate is made. Which part is used to extract it?

• Flower

• Fruits

• Seeds

• Bark

The family containing mustard and its main characters are

• Brassicaceae - Tetramerous flowers, six stamens, bicarpellary gynoecium, siliqua type fruit

• Brassicaceae - Pentamerous flowers, many stamens, pentacarpellary gynoecium, capsule type fruit

• Solanaceae - Pentamerous flowers, five stamens, bicarpellary gynoecium, berry type fruit

• Poaceae - Trimerous flowers, three stamens, monocarpellary gynoecium, caryopsis type of fruit.

Assertion: Ginger has a prostrate-growing rhizome.

Reason: Shoot growth is not effected by gravity

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false.

Assertion: Photomodulation of flowering is a phytochrome - regulated process.

Reason: Active form of phytochrome (Pfr) directly induces floral induction in shoot buds.

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false.

Assertion: The epithelial layer of scutellum of maize is both secretory and absorptive in function.

Reason: The epithelial layer secretes hormones into the endosperm for the synthesis of food
solubilising enzymes and also absorbs and transfers the solubiliscd food to embryo axis.

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false.

Assertion: Deficiency of sulphur causes chlorosis in plants.

Reason: Sulphur is a constituent of chlorophyll, proteins and nucleic acids.

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false.

Two chief functions of the leaves are

• photosynthesis and respiration

• photosynthesis and transpiration

• transpiration and respiration

• respiration and digestion