What is the genetic importance of outcrossing?
(a) Outcrossing is a characteristic of pollinators
(b) Outcrossing increases genetic diversity in a population
(c) Outcrossing increases the chances of sterility
(d) Outcrossing promotes inbreeding in a population

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Self-incompatibility:

  1. Is a device to prevent inbreeding
  2. Provides a biochemical block to self-fertilization.
  3. Ensures cross-fertilization.
  4. Is governed by pollen-pistil interaction
  5. Is governed by series of multiple alleles.
  6. 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.

(a) All are correct                               (b) All are wrong

(c) Only I, II, III are correct                (d) IV and V are wrong

Concept Questions :-

Pollination & Outbreeding Devices
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Which of the following options is correct?
(a) Pollination gives the guarantee of the promotion of post-pollination events that lead to fertilization
(b) The events – “from pollen deposition on stigma until pollen tubes enter the ovule" are together referred to as pollen-pistil interaction
(c) Pollen-pistil interaction is a dynamic process involving pollen recognition followed by only promotion (not rejection) of the pollen
(d) Pistil has no ability to recognize the pollen, whether right or wrong type

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In double fertilization total number of male nuclei and total number of female nuclei involved are:

(a) 3, 2 respectively                           (b) 2, 3 respectively

(c) 2, 2 respectively                           (d) 3, 3 respectively

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A homogamous tall pistillate plant (TT) is crossed with homogamous dwarf staminate plant (tt). What is the genotype of endosperm?

(a) TTT                  (b) TTt                  (c) Ttt                             (d) ttt

Concept Questions :-

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For artificial hybridisation experiment in bisexual flower, which of the sequences is correct?
(a) Bagging → Emasculation → Cross pollination → Rebagging
(b) Emasculation → Bagging → Cross pollination → Rebagging
(c) Cross pollination → Bagging → Emasculation → Rebagging
(d) Self-pollination → Bagging → Emasculation → Rebagging

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Which of the following is false?

  1. Endosperm formation starts prior to first division of zygote
  2. Angiospermic endosperm is mostly 3N while gymnospermic one is N.
  3. The most common type of endosperm is nuclear.
  4. Coconut has both liquid nuclear (multinucleate) and cellular endosperm.
  5. Milky water of green tender coconut is liquid female gametophyte.

(a) I and II only    (b) III only            (c) V only              (d) II only

Concept Questions :-

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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

Concept Questions :-

Pistil: Ovule
Pistil: Female Gametophyte
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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?

 

A

B

C

(a)

Plumule, shoot system formation

Radicle, root system formation

Hypophysis, formation of radicle

(b)

Plumule, shoot system formation

Radicle, root system formation

Cotyledon, food storage

(c)

Radicle, root system formation

Plumule, shoot system formation

Cotyledon, food storage

(d)

Radicle, root system formation

Plumule, shoot system formation

Endsperm, food storage

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I. No endosperm
II. Endosperm present
III. Cotyledons - thin
IV. Cotyledons – thick
VI. Food is stored in cotyledons
VI. Food is stored in endosperms
Sort out correct points (from I to VI) for (A) - Albuminous and (B) - Exalbuminous seeds:
          A                B                       A                  B
(a) II, III, VI    I, IV, V           (b) I, IV, V         II, III, VI
(c) I, III, V      II, IV, VI         (d) II, IV, VI       I, III, V

Concept Questions :-

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