Question 12:

The photoperiod in plants is perceived at
(a) meristem
(b) flower
(c) floral buds
(d) leaves

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Solution

Option (d) leaves

Fully developed leaves receive the stimulus of light photoperiodism is the effect of light and its duration on the growth and development especially flowering in plants.
Even a single leaf as its part is capable of inducing photoperidism but very young leaves are insensitive to light. Other parts meristem flower and floral buds denot perceive the stimulus.

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Statements

All petals are flowers.

Some flowers are buds.

Some buds are leaves.

All leaves are plants.

Conclusions

I. Some petals are buds.

II. Some flowers are plants.

III. No flower is plant.

	Column I		Column II
A.	Vegetative buds	i.	Buds develop in axils of leaves
B.	Floral buds	ii.	Buds produce leafy shoots
C.	Axillary buds	iii.	Reproductive buds that produce flowers
D.	Accessory	iv	Additional buds borne at leaf bases

Statement

Some flowers are fruits

Some fruits are buds

No bud is a leaf

All leaves are plants

Conclusions

I. No plant is bud

II. Some plants are fruits

III. Some buds are flowers

In which of the following pairs of parts of a flowering plant is epidermis absent?

(a) Root tip and shoot tip

(b) Shoot bud and floral bud

(d) Petiole and pedicel

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