PART - 2 - Unit V : CH - 17 Locomotion and Movement — BIOLOGY STD 11 Science — Question

Why does atrial systole always precede ventricular systole?

Algae are known to reproduce asexually by variety of spores under different environmental conditions. Name these spores and the conditions under which they are produced.

Name the following:

1. A poisonous mushroom having white spores.
2. Edible Basidiomycetes.
3. Fungus used in brewing industry.
4. It is searched by trained pets.
5. Root-like, cards-like hyphal masses having a distinct growing point.
6. Non-motile meiospores develop in Basidiomycetes.
7. Compact groups of hyphae produced to overcome unfavourable conditions.

Plants are autotrophic. Can you think of some plants that are partially heterotrophic?

During summer vacation, Nitin was studying inside the home. He said to his mother that he is feeling hot inside. His mother advised him to sit under a tree in the garden to beat the heat. He was surprised after listening to his mother's opinion as temperature was much high outside than inside. He still went out and started studying under the tree. After few hours, he came to his mother and asked about it. His sister who was a biology student of class XI heard their conversation and told his brother that it is all due to the phenomenon of transpiration.

1. What is transpiration? Also indicate the transpiring organ of the plant.
2. What are the general factors that affect transpiration?
3. Name different types of transpiration.
4. What values are displayed by Nitin's sister's character?

In which fields taxonomical aids are helpful? Why taxonomic aids are used in these studies? Which different taxonomical aids are used by the biologists?

Suppose there were plants that had a high concentration of Chlorophyll b, but lacked chlorophyll a, would it carry out photosynthesis? Then why do plants have chlorophyll b and other accessory pigments?

Label the following parts in the given diagram using arrow.

1. Aqueous chamber.
2. Cornea.
3. Lens.
4. Retina.
5. Vitreous chamber.
6. Blind spot.

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Is it correct to say that photosynthesis occurs only in leaves of a plant? Besides leaves, what are the other parts that may be capable of carrying out photosynthesis? Justify.

Neha was walking in the garden early morning and observed many beautiful flowering plants. She got attracted by the brightly coloured flowers and their beautiful appearance. Neha was curious to know about the variation of colours in flowers and asked her biology teacher about this. Teacher told her about the plastids found in only plant cells.

1. Which plastids are found in flowers and fruits?
2. Which plastids are known as kitchen of the cell?
3. Name the colourless plastids.
4. What values are shown by Neha?