Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Datura is a classical example of study of

  1. Monosomics

  2. Trisomics

  3. Triploids

  4. Nullisomics
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Trisomics are those organisms, which have an extra chromosome (2n + 1). Trisomics were obtained for the first time in Datura stramonium (jimson weed) by A.F. Blakeslee and his co-workers. Since haploid chromosome number in this species is n = 12, 12 primary trisomics, 24 secondary trisomics and a large number of tertiary trisomics are possible. Most of the trisomics were identified by size, shape and other morphological features of the fruit.
So, the correct answer is 'Trisomics'.
Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Which one of the following plants has ovary superior, monocarpellary and unilocular with several ovules on marginal placenta?

  1. Anona squamosa

  2. Datura stramonium

  3. Pisum sativum

  4. Ricinus comm unis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Anona squamosa (custard apple) belongs to the Annonaceae family, which features superior ovaries, monocarpellary conditions, and marginal placentation.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Among angiosperm plants, the lowest chromosome & number is found in _________________.

  1. Haplopappus gracilis

  2. Crepis capillaris

  3. Arabidopsis thaliana

  4. Oenothera lamarckiana
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Haplopappus gracilis is well-known in botany for having one of the lowest chromosome numbers (2n = 4) among angiosperms.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

In angiosperms, the wall around the microspore tetrads is deposited with.

  1. Callose

  2. Cellulose

  3. Pectocellu lose

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

During microsporogenesis, the microspore mother cells are surrounded by a callose wall, which is later degraded by the enzyme callase to release the microspores.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

In angiosperms, the egg is?

  1. Completely surrounded by a wall

  2. Surrounded by a wall only at the micropylar end

  3. Surrounded by a wall only at the chalazae end

  4. Devoid of wall
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In angiosperms, the egg cell within the embryo sac is a distinct cell enclosed by a plasma membrane and a cell wall, unlike some primitive plants where gametes might be naked.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Which of the following characters represent the affinities of Gnetum with angiosperms and differences with Cycas and Pinus?

  1. Presence of xylem vessels and absence of archegonia

  2. Perianth and two integuments

  3. Embryo development and apical meristem

  4. Absence of resin ducts and leaf venation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gnetum is considered to have affinities with angiosperms because it possesses xylem vessels and lacks archegonia, which are absent in angiosperms but present in other gymnosperms.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

All the following are the adaptations of land plants except

  1. Protection of the embryo from drying out

  2. Waxy cuticle on leaves to prevent drying out

  3. Waxy cuticle on roots to prevent drying out

  4. Vascular system (in most plants) to move water internally
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Land plants have the vascular system for the movement of water and food internally this includes xylem and phloem.
The embryo is protected from drying out by providing the membranes which help in protecting the embryo.
There is a waxy cuticle on the leaves and this acts as a barrier for the excessive water loss which happens due to transpiration and this prevents leave from drying.
There is no waxy cuticle on the roots as if there is a waxy cuticle on the root then it would be very difficult to absorb water.
So, the correct option is 'waxy cuticle on roots to prevent them from drying out.'
Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

'Wheat' belongs to division ____

  1. Bryophyta

  2. Pteridophyta

  3. Gymnosperms

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

Species of wheat belongs to genus Triticum. Wheat is a type of food crop. Wheat has seeds which as used as food to human beings. Angiosperms include seed containing plants.

So, the correct option is 'Angiosperms'.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

The first true angiosperm evolved from an ancestor is

  1. Arceuthobium

  2. Gnetum

  3. Cycas

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

According to Richard Y-wettstein (Gnetales-angiosperms theory), Gnetales and angiosperms are closely related to each other, because of morphological similarities in the flowers of Gnetum and pro-angiosperms and thus might have originated from common ancestors.

Multiple choice biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

Double fertilization and triple fusion are characteristic of

  1. Spermatophyta

  2. Gymnosperms

  3. Pteridophyta

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

The process in which both nuclei from the pollen tube fuse is referred to as double fertilization. This is perhaps the most characteristic single feature of angiosperms and is not shared with any other group. Gymnosperms, in sharp contrast, have a multicellular female gametophyte, that consists of many hundreds or even thousands of cells. Double fertilization does not take place in this case, and the female gametophyte develops into the food-storage tissue of the seed.

Therefore, the correct answer is option D.