Tag: biology

Questions Related to biology

Datura is a classical example of study of

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Monosomics

  2. Trisomics

  3. Triploids

  4. Nullisomics

Show answer
Correct Option: B
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'.

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

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Anona squamosa

  2. Datura stramonium

  3. Pisum sativum

  4. Ricinus comm unis

Show answer
Correct Option: A

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

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Haplopappus gracilis

  2. Crepis capillaris

  3. Arabidopsis thaliana

  4. Oenothera lamarckiana

Show answer
Correct Option: A

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

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Callose

  2. Cellulose

  3. Pectocellu lose

  4. Sporopollenin

Show answer
Correct Option: A

In angiosperms, the egg is?

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  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

Show answer
Correct Option: A

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

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  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

Show answer
Correct Option: A

All the following are the adaptations of land plants except

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  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

Show answer
Correct Option: C
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.'

'Wheat' belongs to division ____

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Bryophyta

  2. Pteridophyta

  3. Gymnosperms

  4. Angiosperms

Show answer
Correct Option: D
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'.

The first true angiosperm evolved from an ancestor is

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Arceuthobium

  2. Gnetum

  3. Cycas

  4. Taxus

Show answer
Correct Option: B
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.

Double fertilization and triple fusion are characteristic of

biology pictorial feature of plant kingdom phanerogams gymnosperms angiosperms

  1. Spermatophyta

  2. Gymnosperms

  3. Pteridophyta

  4. Angiosperms

Show answer
Correct Option: D
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.