Important questions answer in biology for class 12th

Important questions answer in biology for class 12th

Hi guys in this article you know about important questions answer in Biology for class 12th from lesson- 2 sexual reproduction in flowering plant .

◆Introduction:-Important questions answer in biology class 12th lesson- 2 sexual reproduction in flowering plants. In this topic we include very short answer type questions short answer type questions in simple language which may be asked in your coming Jharkhand academic Council Ranchi board examination from 12th biology. We know that board examination of 12th Biology containing multiple choice questions, fill in the blanks ,matching type questions ,very short answer type questions ,short answer type questions .In lesson 1 reproduction in organism biologysir.com try to explain each subtopics of this chapter like life span of organism asexual reproduction sexual reproduction parthenogenesis external fertilization and internal fertilization .biology sir.com provide you important questions with answer in simple language.

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Important questions in biology for class 12th JAC exam

Q1) what is name of 4 covering layer of microsporangium

Ans. a) epidermis
b) endothecium
c) middle layer
d) tapetum

Q2) what is main function of outermost three layer of microsporangium

Ans. Epidermis endothecium and middle layer is outermost three layer of microsporangium play a major role in in protection and provides resistance to environmental condition

Q3) what is function of tapetum in microsporangium

Ans. Tapetum is innermost layer of micro sporangium. It form nutritive tissue and nourishing the developing microspore.

Q4) what do you mean by microsporogenesis

Ans. Microsporogenesis is the process in which diploid microspore mother cell undergoes meiosis cell division and give rise to four haploid nuclei that is called microspore tetrad.

Q5) what is main parts of pollen grain

Ans:- outermost layer of pollen grain is known as exine and innermost layer of pollen grain is known as intine. Exine is made of sporopollenin material and intine is made of calcium and magnesium pectate.

Q6) what do you mean by palynology

Ans:- the branch of science which deals with the study of pollen grains is called palynology

Q7) what is main types of gynoecium

Ans. On the basis of free and fuse carpels gynoecium is three types

1) apocarpous:- two or more carpels in gynoecium which are free from each other

2) syncarpous:- two or more carpels are fused together to form single compound ovary

3) apocarpous:- ovaries and styles are free gynoecium is considered as apocarpous

■Important questions answer in biology for class 12th lesson- 2 sexual reproduction in flowering plant .

Q8) what do you mean by megasporogenesis

Ans. Diploid megaspore mother cell undergoes meiosis to form four haploid mega spore that step is called megasporogenesis

Q9) what is typical cell and nucleus in mature embryo sac

Ans. Mature embryo sac contain three haploid antipodal cells, two haploid synergid cells 1haploid egg cell and one diploid Central cell which contain two haploid polar nuclei

Q10) what is function of filiform apparatus

Ans. The synergid cells bears cellular thickness at the micropylar end that is called filiform Apparatus which play an important role in guiding Pollen tubes into synergids.

Q11) what is called egg apparatus

Ans. One haploid egg cell and two haploid synergid cells is known as egg apparatus

Q12) what is double fertilization

Ans. The process of fertilization which occurs twice time in the same embryo sac at a time by two male gametes Synagamy and triple fusion

Q13) what do you mean by syngamy

Ans. One male gametes of pollen grain fused with egg cell of mature embryo sac that process is known as synagamy.

■Important questions answer in biology for class 12th lesson- 2 sexual reproduction in flowering plant .

Q14) what do you mean by triple fusion

Ans. 1 male gametes of pollen grains fused with two haploid synergid cells of mature embryo sac that’s form primary endosperm nucleus that process is known as triple fusion

Q15) what is main types of endosperm

Ans. There are three main types of endosperm

1) nuclear endosperm
2) Cellular endosperm
3) helobial endosperm

Q16) what do you mean by endospermic seed

Ans. The seed which are store their reserve food material in endosperm is known as endospermic seed. for example rubber

Q17) what do you mean by non- endospermic seed

Ans. The seed which are store their reserve food material in cotyledon is known as non- endospermic seed .for example gram

Q18) what do you mean by true fruits

Ans. The fruit which are developed from single ovary of single flower with no other parts outside the ovary .ex mango

Q19) what do you mean by false fruits

Ans. When other parts of flower take part in formation of fruit is known as false fruit .example thalamus in apple

Q20) what is main characteristic of wind pollinated plant

Ans. 1) wind pollinated plants are devoid of Scent and nectar
2) they produce large number of dusty pollens
3) movement of pollen is non directional
4) pollen grains are dry and unwettable

Q21) what is main characteristics of insect pollinated plants

Ans. 1) insect pollinated flowers have fragrant and its omit scent and odour

2) insect pollinated flowers are beautifully in coloured

Q22) what do you mean by cleistogamy

Ans. The flower which are never opens and remain closed so there is a self pollination is found in which Pollen Grain transfer within same flower which prevent cross pollination and favour self pollination.

Q23) which are the condition which favour cross pollination

Ans. 1) dicliny unisexuality:- unisexual condition in flower
2) dichogamy:- bisexual flower in which anther and stigma mature at different times
3) suppression of 1 sex:- the flower in which starman or carpal is completely sterile
4) herkogamy:- presence of physical barrier between anther and stigma

Q24) which are the condition which favour self pollination

Ans. 1) homogamy:- the bisexual flower in which anther and stigma mature at same time
2) cleistogamy:- the flower remains closed and never open

■Important questions answer in biology for class 12th lesson- 2 sexual reproduction in flowering plant .

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