a. Flowers are usually large, colourful, fragrant
b. Pollen grains are produced in large number
c. Pollen grains are light in weight and non-sticky
d. Sticky pollen grains
e. Stigma inserted and sticky
f. Edible pollen grains and nectar.
Which of the above characters favour entomophily?
(1) II, IV, V
(2) I, II, III, VI
(3) III, IV, V
(4) I, IV, V, VI
I. Is a device to prevent inbreeding
II. Provides a biochemical block to self-fertilization.
III. Ensures cross-fertilization.
IV. Is governed by pollen-pistil interaction
V. Is governed by series of multiple alleles.
VI. Prevents self pollen (from the same flower or other flowers of the same plant) from fertilizing the ovules inhibiting pollen germination or pollen tube growth in the pistil.
(1) All are correct
(2) All are wrong
(3) Only I, II, III are correct
(4) IV and V are wrong
Which of the following options is correct?
|1.||Pollination gives the guarantee of the promotion of post-pollination events that lead to fertilization|
|2.||The events – “from pollen deposition on stigma until pollen tubes enter the ovule" are together referred to as pollen-pistil interaction|
|3.||Pollen-pistil interaction is a dynamic process involving pollen recognition followed by only promotion (not rejection) of the pollen|
|4.||Pistil has no ability to recognize the pollen, whether right or wrong type|
In double fertilization total number of male nuclei and total number of female nuclei involved are:
(1) 3, 2 respectively
(2) 2, 3 respectively
(3) 2, 2 respectively
(4) 3, 3 respectively
A homogamous tall pistillate plant (TT) is crossed with homogamous dwarf staminate plant (tt). What is the genotype of endosperm?
For artificial hybridisation experiment in bisexual flower, which of the sequences is correct?
(1) Bagging → Emasculation → Cross pollination → Rebagging
(2) Emasculation → Bagging → Cross pollination → Rebagging
(3) Cross pollination → Bagging → Emasculation → Rebagging
(4) Self-pollination → Bagging → Emasculation → Rebagging
Which of the following is false?
I. Endosperm formation starts prior to first division of zygote
II. Angiospermic endosperm is mostly 3N while gymnospermic one is N.
III. The most common type of endosperm is nuclear.
IV. Coconut has both liquid nuclear (multinucleate) and cellular endosperm.
V. Milky water of green tender coconut is liquid female gametophyte.
(1) I and II only
(2) III only
(3) V only
(4) II only
Diagram given below shows stages in embryogenesis in a typical dicot (Capsella). Identify structures A to D respectively:
(a) Suspensor, Radicle, Plumule, Cotyledons
(b) Hypophysis, Radicle, Plumule, Cotyledons
(c) Suspensor, Plumule, Radicle, Cotyledons
(d) Suspensor, Radicule, Plumule, Hypocotyls
Go through the given diagram of a typical dicot embryo. In which of the following all the 3 parts labelled as A, B, C with their respective functions are correctly identified?
Which are the external conditions required for seed germination:
(1) Oxygen, carbon dioxide and suitable temperature
(2) Oxygen, light and suitable temperature
(3) Light, moisture and suitable temperature
(4) Oxygen, moisture and suitable temperature