Question

two characteristics of Phylum Porifera.
cose
लिखिये।
शैवाल के दो आर्थिक महत्त्व लिखिये।
अथवा /OR
Write two economic importance of Algae.
प्र6 न्यूक्लियोटाइड क्या है?
What is Nucleotide?
अथवा/OF
जल के दो मुख्य गुण लिखिये।
Write two main properties of water
142 [M-2915-B]
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Answer 1

Answer; TWO CHARECTERISTICS OF PHYLUM PORIFERA-

1, They can regenerate their lost part.

2,They exhibits holozoic nutrition.

OR

Economic importance of algae;

1. it help to maintain the health of marine ecosystem.

2. algae are rich in minerals and vitamins so, the are used as the liquid fertilizers ,helps in  repairing level of the nitrogen present in the soil.

Q6

Answer; Nucleotide is the basic building block of nucleic acid . A nucleotide consist of the sugar molecules attached to a phosphate group and nitrogen -containing base.

OR

main properties of water;

polarity, cohesion , surface tension , high specific heat capacity, etc.

Answer 2

Answer:

1- the following are the two characteristics of phylum porifera:- The body has no organs.

they exhibit holozoic nutrition.

2= the two main properties of water are = water is polar .

water has high heat capacity.