Science (English Medium) Class 11 - CBSE Question Bank Solutions

What is the significance of double circulation?

Terrestrial animals are generally either ureotelic or uricotelic, not ammonotelic, why?

Give a brief account of: Mechanism of vision

Plants of this group are diploid and well adapted to extreme conditions. They grow bearing sporophylls in compact structures called cones. The group in reference is ______.

The giant Redwood tree (Sequoia sempervirens) is a/an ______.

Each plant or group of plants has some phylogenetic significance in relation to evolution: Cycas, one of the few living members of gymnosperms is called as the ‘relic of past’. Can you establish a phylogenetic relationship of Cycas with any other group of plants that justifies the above statement?

In which plant will you look for mycorrhiza and corolloid roots? Also explain what these terms mean.

Lichen is usually cited as an example of ‘symbiosis’ in plants where an algal and a fungal species live together for their mutual benefit. Which of the following will happen if algal and fungal partners are separated from each other?

1. Both will survive and grow normally and independent from each other.
2. Both will die
3. Algal component will survive while the fungal component will die.
4. Fungal component will survive while algal partner will die.

Based on your answer how do you justify this association as symbiosis.

What is the function of phloem parenchyma?

Below is a list of plant fibres. From which part of the plant these are obtained

Hemp

Below is a list of plant fibres. From which part of the plant these are obtained

Jute

The following terms has some anatomical significance. What do these terms mean? Explain with the help of line diagrams.

Plasmodesmata

Which one of the following statements is true for cockroach?

Where are sclerites present in cockroach?

Which mouth part of cockroach is comparable to our tongue?

Differentiate between Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER).

Eukaryotic cells have organelles which may

1. not be bound by a membrane
2. bound by a single membrane
3. bound by a double membrane

Group the various sub-cellular organelles into these three categories.

Write the function of the following:

Smooth ER

Write the function of the following:

Golgi Apparatus

Write the function of the following:

Centrioles