Tag: botany

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Questions Related to botany

Multiple choice self pollination asexual and sexual reproduction in plants botany

Match the entries in Column 1 with those of column 2 and choose the correct answer:

         Column 1(Name of pollination)         Column 2(Type of pollination)
(a) Cleistogamy (m) Insect pollination
(b) Geitonogamy (n) Bud pollination
(c) Entomophily (o) Pollination between flowers in the same plant
(d) Xenogamy (p) Wind pollination
(q) Cross pollination

  1. a-o;b-m;c-q;d-n

  2. a-m;b-q;c-n;d-o

  3. a-n;b-o;c-m;d-q

  4. a-q;b-p;c-o;d-n
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cleistogamy is the type of automatic self-pollination of certain plants. This is a form that is used to propagate plants by using self-pollinating flowers in bud state. This is also known as bud pollination.

•           Geitonogamy is the process for which the fertilization of a flower by pollen from another flower on the same plant.

•           Entomophily is the process in which pollinations are carried out by insects.

•           Xenogamy is the process of transfer of pollen grains to the stigma of a different plant. This process is cross-pollination.

Thus, the correct answer is option C.

Multiple choice self pollination asexual and sexual reproduction in plants botany

The condition of maturation of anthers and stigmas of the same flower simultaneously is

  1. Xenogamy

  2. Geitonogamy

  3. Allogamy

  4. Homogamy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Geitonogamy: The transfer of pollen grains from the anther of a flower to the stigma of another flower borne by the same plant.

Xenogamy: Transfer of pollen grains from the anther of a flower to the stigma of another flower borne on a different plant but belonging to the same species.

Allogamy is the deposition of pollen grains from the anther of the one flower on the stigma of another flower, either in the same plant or in a different plant of the same species.

Homogamy: It is the condition in which flowers are bisexual anther and stigma mature at the same time to make self-pollination possible. Under this condition, the stigma receives the pollen grains from the anthers of the same flower by the agency of wind or insects.

 So, the correct answer is D.

Multiple choice self pollination asexual and sexual reproduction in plants botany

What is pre-requisite for self pollination?

  1. Chasmogamy

  2. Homogamy

  3. Absence of pollenkitt

  4. Absence of nectar
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Homogamy refers to the simultaneous maturation of anthers and stigmas in a bisexual flower, which serves as a crucial pre-requisite for self-pollination to occur successfully.

Multiple choice self pollination asexual and sexual reproduction in plants botany

The condition of maturation of stigma before anthers of the same flower is

  1. Protandry

  2. Herkogamy

  3. Protogyny

  4. Prepotency
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Protogyny is the maturation of the stigma (female part) before the anthers (male part) in the same flower. Protandry is the opposite, where anthers mature first.

Multiple choice self pollination asexual and sexual reproduction in plants botany

Assertion (A):  Self ineompatibility is not an absolute phenomenon.
Reason (R): Even highly self-incompatible species can be self-pollinated by one stratagem or another.

  1. Both A and Rare individually true and R is the correct explanation of A

  2. Both A and Rare individually true and R is not the correct explanation of A

  3. A is true but R is false

  4. A is false but R is true Assertion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Self-incompatibility is a mechanism to prevent self-fertilization, but it can often be bypassed by techniques like bud pollination or high salt concentrations on the stigma. Thus, it is not an absolute barrier.

Multiple choice self pollination asexual and sexual reproduction in plants botany

Consider the following with reference to sporophytic (SSI) or gametophytic (GSI) self-incompatibility systems:
1. SSI-3 celled pollen, rejection reaction on the stigma
2. GSI -2 celled pollen, rejection reaction in the style. SSI -2 called pollen, rejection reaction in the style.
3. GSI- 3 celled pollen, rejection reaction on the stigma
Which of these features are correct in the case of sporophytic gametophytic self- incompatibility systems?

  1. 1 and 2

  2. 2 and 3

  3. 2 and 4

  4. 3 and 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Sporophytic Self-Incompatibility (SSI), pollen is typically 2-celled and rejected on the stigma. In Gametophytic Self-Incompatibility (GSI), pollen is typically 2-celled and rejected in the style.

Multiple choice self pollination asexual and sexual reproduction in plants botany

Cleistogamy is found in _____________.

  1. Ficus

  2. Commelina

  3. Vallisnerea

  4. Anthocephalus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cleistogamy is the condition where flowers remain closed and undergo self-pollination internally. This adaptation is commonly observed in plants such as Commelina, Viola, and Oxalis.

Multiple choice botany photosynthesis types of chlorophyll pigments photosynthetic pigments
Accessory photosynthetic pigments in most green plants are 
  1. Chlorophyll $a$
  2. Chlorophyll $b$

  3. Carotenoids and xanthophylls

  4. Both (b) and (c)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Chlorophyll a is found in almost all photosynthetic plants except bacteria it is called primary photosynthetic pigment because it performs primary reactions of photosynthesis which involve the conversion of light energy into chemical energy. other photosynthetic pigments like chlorophyll b, xanthophylls and carotenes are called accessory pigments. They absorb light energy of different wavelengths, broaden the spectrum of light absorption and hand over the energy to chlorophyll aq through electron spin resonance and also protect chlorophyll a from photo-oxidation.
So the correct option is 'both (b) and (c)'.