STD 12 - 1. sexual reproduction in flowering plants — NEET STD 11 Science — Question

Antheridia and archegonia are most reduced in

Phytohormones responsible for cell division in callus are ______ and ______.

Microphyllous leaves are produced in

Fill in the blanks and choose the correct option given below.
(i) A prom l otes senescence and abscission of plant organs especially of leaves and flowers.
(ii) The rise in rate of respiration during ripening of fruits is called as respiratory B.
(ii) C regulates many physiological processes so it is the one of the most widely used PGR in agriculture.
(iv) The most widely used compound as source of ethylene is D.
(v) Ethephon hastens fruit ripening in tomatoes and apples and accelerates E in flowers and fruits.
(vi) F is general plant growth inhibitor and an inhibitor of plant metabolism.
(vii) G stimulates the closure of stomata in the epidermis and increase the tolerance of plants to various kinds of stresses. It is also called the H hormone.
(viii) I helps seeds to withstand desiccation and other factors unfavorable for growth. In most situations, it acts as an antagonist to J.
(ix) The response of plants to periods of day/night is termed K.
(x) The sites of perception of light/dark duration are the L in plants.
(xi) The hormonal substance migrates from M to N apices for inducing flowering only when the plants are exposed to the necessary inductive photoperiod.
(xii) There are plants for which flowering is either quantitatively or qualitatively dependent on exposure to low temperature. This phenomenon is termed O.

Kingdom protista includes

Which hormone is present in the pulp of fruit, seed coat and resting buds

Blue-green algae are included in

Assertion: Except for plants in shade or in dense forests, light is rarely a limiting factor in nature.
Reason: In photosynthesis light saturation occurs at 10 per cent of the full sunlight.

A root hair is formed by