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Biology

General

Easy

Question

A mature pollen grain of $P i n u s$ has

2 cells
3 cells
4 cells
5 cells

The correct answer is: 4 cells

In $P i n u s comma$ the microspore nucleus divides by a periclinal wall and forms a very small prothallial cell and large central cell. The central cell cuts off a second prothallial cell and antheridial cell. The nucleus of the antheridial cell divides to form generative cell and tube cell. Thus, the pollen grain of $P i n u s$ is sheded at four-celled stage when it consists of two vegetative prothallial cells, a generative cell and a tube cell.

Related Questions to study

Cyanobacterium is an algae having

Cyanobacterium is an algae having

In gymnosperms, the pollen chamber represents

In gymnosperms, the pollen chamber represents

Which one of the following is called maiden-hair fern?

Which one of the following is called maiden-hair fern?

parallel

Though $C y c a s$ has two cotyledons, this is not included in dicot because

Though $C y c a s$ has two cotyledons, this is not included in dicot because

The plant body of all bryophytes are haploid and thallus like having

The plant body of all bryophytes are haploid and thallus like having

In $F u n a r i a$ capsule, dispersal of spores takes place through

In $F u n a r i a$ capsule, dispersal of spores takes place through

parallel

‘Chilgoza’ a gymnospermic seed that is eaten as dry fruit is produced by

‘Chilgoza’ a gymnospermic seed that is eaten as dry fruit is produced by

Cycads are

Cycads are

Stamen consists of

Stamen consists of

parallel

Consider the following statements about green algae
I) Green algae are green due to the presence of chlorophyll- $a$ and $b$ pigments localised in chloroplast
II) Algae store food in form of starch in a specialised structures called pyrenoids located in chloroplast. Food may be stored in form of oil droplets
III) Vegetative reproduction occurs through cell division, fragmentation, stolons and tubers
Which of the statements given above are correct?

Consider the following statements about green algae
I) Green algae are green due to the presence of chlorophyll- $a$ and $b$ pigments localised in chloroplast
II) Algae store food in form of starch in a specialised structures called pyrenoids located in chloroplast. Food may be stored in form of oil droplets
III) Vegetative reproduction occurs through cell division, fragmentation, stolons and tubers
Which of the statements given above are correct?

Gymnosperms are naked seeded plants because

Gymnosperms are naked seeded plants because

Find out the mis-matched pair.

Find out the mis-matched pair.

parallel

Which statement is incorrect about $P i n u s$ ?

Which statement is incorrect about $P i n u s$ ?

Which of the following pteridophytes is heterosporous in nature?

Which of the following pteridophytes is heterosporous in nature?

Observe the diagrams given below and choose the correct option out of $A$ of $C$ , in which all the three items $A comma blank B$ and $C$ are rightly identified

Observe the diagrams given below and choose the correct option out of $A$ of $C$ , in which all the three items $A comma blank B$ and $C$ are rightly identified
BiologyGeneral

parallel

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