Multiple Choice QuestionsWhy are vascular bundles closed in monocots?
Xylem and phloem are present.
Xylem and phloem occur in separate bundles.
Vascular cambium is present between xylem and phloem.
Vascular cambium is not present.
What do A, B, C and D represent in the following figure?
A : carrier protein, B: symport, C: uniport, D : antiport
A : carrier protein, B : uniport, C: antiport, D : symport
A: carrier protein, B: antiport, C: symport, D : uniport
A : carrier protein, B: uniport, C: symport, D : antiport
Gametophyte and sporophyte are independent of each other in which of the following groups?
Pteridophytes
Angiosperms
Gymnosperms
Bryophytes
Which of the following is correct?
Paneth cells secrete pepsinogen
Parietal cells secrete hydrochloric acid
Argentaffin cells secrete mucus
Chief cells secrete gastrin
Which of the following is correct about the given figure?
The length ofthe thick and thin myofilaments has changed.
Length of both anisotropic and isotropic band has changed.
The myosin cross-bridges move on the surface of actin and the thin and thick myofilaments slide past each other.
Length of the sarcomere remains same.
What is correct about the movement of substance across the membrane in facilitated diffusion?
It is an active transport
It doesn't cause transport of molecules from low concentration to high concentration
It is insensitive to inhibitors
It is a very specific transport
Refer the given figures on photoperiodism and select the correct option.
| A | B | C |
| no correlation between light period and flowering | long light- exposure period | short light- exposure period |
| A | B | C |
| long light- exposure period | no correlation between light period and flowering | short light- exposure period |
| A | B | C |
| short light exposure period | long light exposure period | no correlation between light period and flowering |
| A | B | C |
| no correlation between light period and flowering | short light exposure period | long light exposure period |
C.
| A | B | C |
| short light exposure period | long light exposure period | no correlation between light period and flowering |
A plant that requires a long period of darkness, is termed as "short day" (long night) plants. The form flowers only when day length is less than about 12 hours.
Long- day plant is a term used to refer to flowers that require long light hours and short darkness hours before blooming. These plants require much less darkness to begin the process of flowering.
A day- neutral plant is a plant that flowers regardless of the amount of light of daylight it receives. Eg. Corn and rice that will bloom whether the day is long or short.
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