12th Botany - Asexual and Sexual Reproduction in Plants Two Marks Questions | QB365

12th Standard Syllabus & Materials

12th Standard

TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

12th Botany - Asexual and Sexual Reproduction in Plants Two Marks Questions

Published on: 28/09/2019

Botany - Asexual and Sexual Reproduction in Plants

Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

Questions + Answers key

Take MCQ Biology Test

QB365 Student Learing Managemnet System

Std: 12th Standard - Biology

chapter: - Model Question paper

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Generic 2

13 x 2 = 26

What is pollen pistil interaction?

Distinguish between anemophilous flowers and ornithophilous flowers

How the pollen grains of Vallisneria protect themselves?

Define Homogamy with an example

Why pollination in gymnosperm is said to be direct?

Differentiate between Exine and Intine layers of pollen grain.

Name the two types of tapetum based on its behaviour.

Define totipotency.

Name any four types of grafting

10.

Name the vegetative propagules of the following plants
(a) Allium cepa
(b) Zingiber Officinalis
(c) Agave
(d) Colocasia

11.

What are diaspores?

12.

What is layering?

13.

Mention the contribution of Hofmeister towards Embryology.

Generic 3

1 x 3 = 3

14.

Distinguish mound layering and air layering.

Generic 5

1 x 5 = 5

15.

Explain the conventional methods adopted in vegetative propagation of higher plants.

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Generic 2

13 x 2 = 26

The events from pollen deposition on the stigma to the entry of pollen tube into the ovule is called pollen - pistil interaction. It is a dynamic process which involves recognition of pollen and to promote or inhabit its germination and growth.

Anemophilous Flowers	Ornithophilous Flowers
(a) Small sized flowers	Large sized flowers
(b) Colorless	Brightly colored
(c) Donor produce nectar	Produce large quantity of nectar
E.g: Grasses	Bombax

Vallisneria is an aquatic plant. Pollen grains of Vallisneria are covered by mucilage coating which protects them from wetting.

When the stamens and stigma of a flower mature at the same time it is said to be homogamy. It favours self-pollination to occur. Example: Mirabilis jalapa.

Pollination in gymnosperms is said to be direct as the pollens are deposited directly on the exposed ovules.

Exine	Intine
Thick outer layers	Thin inner layer
It is made of cellulose, sporopollenin, and pollenkitt	It is made up of pectin hemicellulose, cellulose, and callose
Ununiform layer	Uniform layer

Tapetum are of two types. Secretory tapetum and Invasive tapetum. Tapetum nourishes the pollen grains.

The genetic ability of a plant cell to produce the entire plant under suitable conditions is said to be totipotency.

(a) Bud grafting
(b) Tongue grafting
(c) Crown grafting
(d) Wedge grafting

10.

(a) Allium cepa - Bulb
(b) Zingiber officinal is - Rhizome
(c) Agave - Bulbils
(d) Colocasia - Corm

11.

The unit of reproductive structures used in vegetative propagation is called diaspore or reproductive propagules.

12.

The stem of a parent plant is allowed to develop roots. After formation of roots, the rooted part is cut and separated and planted to grow into a new plant (eg) Ixora and Jasminum.

13.

Hofmeister described the structure of pollen tetrad

Generic 3

1 x 3 = 3

14.

Mound Layering	Air Layering
A lower flexible branch of the plant is selected.	A healthy, stiff branch of the plant is selected.
The branch is bent to the ground.	The stem is girdled at the nodal region hormones applied.
A part of the branch is buried in the soil leaving the tips exposed and allowed for rooting	The girdled portion is covered with Damp or moist soil and allowed for rooting.

Generic 5

1 x 5 = 5

15.

Artificial propagation of higher plants used by man for a very long time are called conventional methods
1) Cutting
The cut parts from (root, stem, leaf) parent plant are grown in suitable medium. They grow into new plants
Example:
(i) Root Cutting - Malus.
(ii) Stem Cutting - Hibiscus.
(iii) Leaf cutting - Begonia.
2) Grafting
Parts of two different plants are joined so that they continue to grow as one plant of the two plants the plant which is in contact with the soil is called stock the plant used for grafting is called scion.
Example:
(i) Citrus, Mango.
(ii) There are different types of grafting based on the method of uniting the scion and stock.
Layering
The stem of the parent plant is allowed to develop roots while still intact. After the roots formation rooted part is cut and planted to grow as a new plant.
Example:
Ixora, Jasminum
It is of two types - Mound / Air layering.