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Biology (Class XI/XII)

Description: Devices of PollinationPollinationReproductive Organs of PlantsSexual Reproduction in Flowering PlantsGenetics and EvolutionBiologyEnvironmental IssuesEnvironmental IssuesDevelopment of Seeds and Fruits Seed
Number of Questions: 20
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Tags: Devices of Pollination Pollination Reproductive Organs of Plants Sexual Reproduction in Flowering Plants Genetics and Evolution Biology Environmental Issues Development of Seeds and Fruits Seed
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The study of flowers is called

  1. pomology

  2. spermology

  3. mycology

  4. anthology


Correct Option: D
Explanation:

It refers to the study of flowers .

Pollination by snails is called

  1. malcophily

  2. ornithophily

  3. anemophily

  4. hydrophily


Correct Option: A
Explanation:

This pollination is done by snails and slugs.

Environmental planning organisation is

  1. CSIR

  2. NEERI

  3. ICAR

  4. CFTRI


Correct Option: B
Explanation:

National environmental engineering researrch institute.

When there is a bunch of flagella on both the ends of the bacterium then this category of bacteria is known as

  1. amphitrichous

  2. peritrichous

  3. monotrichous

  4. atrichous


Correct Option: A
Explanation:

In this type a bunch of flagella is present on both the sides. For eg. Nitrosomonas.

When the funicle, chalaza and micropyle lie in one and the same vertical line in the ovule, the ovule is called

  1. anatropus

  2. amphitropus

  3. orthotropus

  4. hemitropus


Correct Option: C
Explanation:

The funicle ,chalaza and hilum lie in the same vertical ine.

The development of seedless fruits is called

  1. herkogamy

  2. parthenocarpy

  3. parthenogenesis

  4. morphogenesis


Correct Option: B
Explanation:

This is the development of seedless fruit.

Field capacity is the extent to which a soil can hold

  1. gravitational water

  2. capillary water

  3. hygroscopic water

  4. capillary, hygroscopic and bound water


Correct Option: D
Explanation:

Field capacity includes every option other than gravitational water.

'Pepo ' fruit is the characteristic of which family?

  1. Cucurbitaceae

  2. Solanaceae

  3. Compositae

  4. Leguminoseae


Correct Option: A
Explanation:

It is elongated and a tough skinned fruit ,characteristic of cucurbitaceae family.

'Pepo ' fruit is the characteristic of which family?

  1. Cucurbitaceae

  2. Solanaceae

  3. Compositae

  4. Leguminoseae


Correct Option: A
Explanation:

It is elongated and tough skinned fruit ,characteristic of cucurbitaceae family.

What forms the part of future sporophyte in Cycas?

  1. Embryo

  2. Endosperm

  3. Seed coat

  4. Nucellus


Correct Option: A
Explanation:

It is the diploid structure which forms the part of future sporophyte in Cycas.

Which one is a trisomic condition?

  1. 2n-1

  2. 2n+1

  3. 2n-2

  4. XXXX


Correct Option: B
Explanation:

Trisomy

Prothallus represents the

  1. sporophytic phase in pteridophytes

  2. sporophytic phase in gymnosperms

  3. sporophytic phase in angiosperms

  4. gametophytic phase in pteridophytes


Correct Option: D
Explanation:

Gametophytic phase in Pteridophytes is represented by prothallus,  which is independent.and is formed by germinating spore.In pteridophytes a phenomena called alternation of generation is found in which the sporophytic and gametophytic phase alternates.

Datura is an example of

  1. Monosomy

  2. Eupolidy

  3. Trisomy

  4. Inversion


Correct Option: C
Explanation:

It is a genetic abnormality in which there are three copies instead of two of a particular chromosome.

Who proved that sulphur bacteria use Hydrogen sulphide in place of water and carbon dioxide to synthesize carbohydrates?

  1. C.B. Van Niel

  2. Nicolas De Saussure

  3. Ruben and Kamen

  4. Robert Hill


Correct Option: A
Explanation:

By studying green sulfur and purple sulfur bacteria he was the first scientist to demonstrate that photosynthesis is a light dependent redox reaction in which hydrogen from an oxidizable compound such as hydrogen sulphide reduces carbon dioxide to carbohydrates.

The branch of science that deals with the study of grasses is called

  1. anatomy

  2. agrology-

  3. agrobiology

  4. agrostology


Correct Option: D
Explanation:

It is the branch of botany also called as graminology which deals with the study of grasses.

Hydrilla and vallisneria show which type of movement?

  1. Cyclosis

  2. Phototactic movement

  3. Chemotactic movement

  4. Mechanical movement


Correct Option: A
Explanation:

In this the protoplasm moves around a single central vacuole in either clockwise or anti clockwise direction.

Cremocarp is the characteristic of which family?

  1. Umbelliferae

  2. Pepo

  3. Berry

  4. Cypsella


Correct Option: A
Explanation:

These fruits are bilocularand two seeded and develop from bicarpellary,syncarpous, inferior ovary like in umbelliferae.

Placentation in leguminosae is

  1. Marginal placentation

  2. Axile placentation

  3. Parietal placentation

  4. Basal placentation


Correct Option: A
Explanation:

Ovules  are borne on the margins of the wall.

Who coined the term gene?

  1. Mendel

  2. Hugo de vries

  3. Morgan

  4. Johanassen


Correct Option: D
Explanation:

He was the Danish botanist who coined the term gene.

The exchange of chromosomal segments between non-homologus chromosomes is called

  1. inversion

  2. heterozygosity

  3. deletion

  4. translocation


Correct Option: D
Explanation:

It is a chromosome abnormality caused by rearrangement of parts betwen non-homologus chromosomes.

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