PART - 2 - Unit V : CH - 15 Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Mention the ploidy of the following:
i. Protonemal cell of a moss
ii. Primary endosperm nucleus in dicot
iii. Leaf cell of a moss
iv. Prothallus cell of a fern
v. Gemma cell in Marchantia
vi. Meristem cell of monocot
vii. Ovum of a liverwort
viii. Zygote of a fern

Name the components of the formed elements in the blood and mention one major function of each of them.

Give a brief account of viruses with respect to their structure and nature of genetic material. Also name four common viral diseases.

Mango and coconut are ‘drupe’ type of fruits. In mango fleshy mesocarp is edible. What is the edible part of coconut? What does milk of tender coconut represent?

Give reasons for the following.

1. Plants are the lungs of nature.
2. Chlorophyll-b and other accessory pigments are necessary for photosynthesis.
3. In the high light intensities, the chlorophyll-a gets damaged.

Name the scientists who proposed the cell theory. Also, list its main postulates.

Distinguish between :
afferent neurons and efferent neurons

Write a short note on electrocardiogram (ECG).

Define the term inflorescence. Explain the basis for the different types inflorescence in flowering plants.

On world AiDs day Ankit and his friends arranged an awareness compaign programme in their locality. Some elderly people rebuked the children and asked them not to talk of such things in public. The children convinced the elders about the need ror the programme and on understanding their point of view, they also joined the campaign.

1. What is AIDS?
2. Name the causal agent of AIDS.
3. What type of genetic material is found in AIDS virus?
4. What values did Ankit and his friends show on the occasion.