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Science Answer the following questions: [2 M]

Plants: Structure and Function · Maharashtra Board STD 7 (MSBSHSE - Semi English Medium). 9 questions.

Questions

Answer the following questions: [2 M]

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9 questions · self-marked practice — reveal the answer and mark yourself.

Question 12 Marks
Of what use to a plant are the insects flitting about around its flowers?
Answer
  1. The insects try to suck the nectar from the flowers and in that process the pollen grains stick to their legs.
  2. When they sit on another flower the pollen grain stick to the stigma and the pollination takes place. Thus, these insects help in the pollination.
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Question 22 Marks
What will happen if the root-tip is injured?
Answer
  1. Root cap helps the root to grow downward It protects the sensitive part of the root and eases the movement of the root through the soil.
  2. Injury of the root tip causes the root to grow randomly and it also may lead to injury of the sensitive part of the root.
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Question 32 Marks
What would have happened if plants like tamarind, banyan and mango had fibrous roots?
Answer
If plants like banyan, mango, tamarind had fibrous roots they would get uprooted and fall even with a little strong wind as the roots would not be able to support and anchor the trees firmly.
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Question 42 Marks
Why are the underground parts of plants like radish, carrot, beet and sweet potato thick, fleshy and swollen? Which parts of the plant are they?
Answer
The underground parts of plants like radish, carrot, beet and sweet potato are thick, fleshy and swollen because they store food in the form of starch. These are the root part of the plant.
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Question 52 Marks
What is pollination?
Answer
After maturity, anthers burst and the pollen grains which are released fall on the stigma. This process is called pollination.
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Question 62 Marks
What is called parallel venation?
Answer
In a leaf all the veins are parallel, running from the leaf base to the leaf apex. Such a venation is called parallel venation.
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Question 72 Marks
What is called reticulate venation?
Answer
  1. A leaf is divided into two equal parts by a single mid-vein which lies along the midline of the leaf blade.
  2. Secondary veins arise from the mid-vein. They are branched and form a network or reticulum. Such a type of venation is called reticulate venation.
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Question 82 Marks
What are called prop roots?
Answer
Roots emerging from the trunk and branches of a banyan tree grow towards the soil. These roots are called prop roots.
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Question 92 Marks
Which types of roots do the fenugreek, spinach and onion plants have?
Answer
  1. Fenugreek and spinach have tap roots with a few secondary roots whereas onion has fibrous root.
  2. Fenugreek roots also have some nodules which contain nitrogen fixing bacteria.
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